Electrical Terminal and Electrical Connector in Vertical Compression Contact with Chip Module

CROSS-REFERENCE

TO RELATED PATENT APPLICATION This application is a continuation-in-part of U.S. application Ser. No. 16/716,651, filed Dec. 17, 2019 and currently pending, which itself claims priority to and the benefit of, pursuant to 35 U.S.C. § 119(a), patent application Serial No. CN201910014252.2 filed in China on Jan. 8, 2019. The disclosure of each of the above applications is incorporated herein in its entirety by reference. Some references, which may include patents, patent applications and various publications, are cited and discussed in the description of this disclosure. The citation and/or discussion of such references is provided merely to clarify the description of the present disclosure and is not an admission that any such reference is “prior art” to the disclosure described herein. All references cited and discussed in this specification are incorporated herein by reference in their entireties and to the same extent as if each reference were individually incorporated by reference. FIELD The present invention relates to an electrical terminal and an electrical connector, and in particular to an electrical terminal and an electrical connector in vertical compression contact with a chip module.

BACKGROUND

The background description provided herein is for the purpose of generally presenting the context of the disclosure. Work of the presently named inventors, to the extent it is described in this background section, as well as aspects of the description that may not otherwise qualify as prior art at the time of filing, are neither expressly nor impliedly admitted as prior art against the present disclosure. The Chinese Patent No. CN201721184115.6 discloses an electrical connector, which has a plurality of electrical terminals used to be electrically connected to a chip module. Each electrical terminal includes: a base, an elastic arm formed by bending and extending upward from the base, and a through groove running through the elastic arm along a thickness direction of the elastic arm, such that the elastic arm forms two branches at two sides of the through groove, thereby forming two conductive paths in parallel and respectively passing through the two branches between the chip module and a circuit board to reduce the impedance between the chip module and the circuit board during transmission of electrical signals. However, since the medium surrounding the elastic arm of each electrical terminal is air, and the air has a smaller dielectric coefficient, the impedance of the elastic arm of each electrical terminal is greater, thus affecting the high frequency performance of the electrical terminals. Therefore, a heretofore unaddressed need to design a new electrical terminal and an electrical connector exists in the art to address the aforementioned deficiencies and inadequacies.

SUMMARY

The present invention is directed to an electrical terminal and an electrical connector, in which the high frequency performance are improved by increasing the capacitance of the elastic arm of each electrical terminal. To achieve the foregoing objective, the present invention adopts the following technical solutions. An electrical terminal includes: a base; a first elastic arm and a second elastic arm formed side by side by extending upwardly from an upper end of the base, wherein the first elastic arm has a mating portion, and the second elastic arm has a contact portion; and a protruding portion, protruding and extending from a first side of the first elastic arm, wherein the first side of the first elastic arm is adjacent to the second elastic arm, and a lower surface of the protruding portion has a contact surface overlapping with the contact portion in a vertical direction, such that the contact portion upwardly abuts the contact surface. In certain embodiments, the protruding portion has a cutting surface, a length of the first elastic arm from the cutting surface to the upper end of the base is greater than or equal to a length of the second elastic arm, and the second elastic arm is connected to the cutting surface before being formed and is cut off from the cutting surface after being formed. In certain embodiments, a first torn surface is provided on the first side of the first elastic arm adjacent to the second elastic arm, and one of two opposite sides of the second elastic arm is formed by tearing from the first torn surface. In certain embodiments, a third elastic arm extends upwardly from the base to the protruding portion, the second elastic arm is located between the first elastic arm and the third elastic arm, a second torn surface is provided on one side of the third elastic arm adjacent to the second elastic arm, the other of the two opposite sides of the second elastic arm is formed by tearing from the second torn surface, and the first elastic arm and the third elastic arm are provided in parallel. In certain embodiments, a strip connecting portion is formed by extending from the base and is configured to be connected to a strip, the strip connecting portion is located at a second side of the first elastic arm, and the second side of the first elastic arm is located away from the second elastic arm. In certain embodiments, the first elastic arm has a connecting portion connected to the upper end of the base, the connecting portion and the protruding portion are located at two opposite sides of the base, the second elastic arm has an extending portion connected to the upper end of the base, the extending portion and the contact portion are located at the two opposite sides of the base, and the connecting portion and the extending portion are located at a same side of the base. In certain embodiments, the contact portion is flat plate shaped, and the contact surface is arc shaped. The present invention further provides an electrical connector, configured to be electrically connected to a chip module. The electrical connector includes: a body, having a plurality of accommodating holes running vertically; and a plurality of electrical terminals, respectively accommodated in the accommodating holes correspondingly, wherein each of the electrical terminals has: a base, being flat plate shaped; a strip connecting portion, formed by extending upwardly from an upper end of the base, and configured to be connected to a strip; a first elastic arm formed by extending upwardly from the upper end of the base, wherein a top portion of the first elastic arm has a mating portion configured to upwardly abut the chip module, a through groove runs through the first elastic arm along a thickness direction of the first elastic arm, one of an upper end and a lower end of the through groove is defined as a first end, and the other of the upper end and the lower end of the through groove is defined as a second end; and a second elastic arm, wherein one of an upper end and a lower end of the second elastic arm is defined as a third end, the other of the upper end and the lower end of the second elastic arm is defined as a fourth end, the third end is integrally connected to the first end, the fourth end is integrally connected to the second end prior to being formed and is broken from the second end after being formed, the second elastic arm has a contact portion, and when the chip module is pressed downwardly on the mating portion to a final position, the contact portion is in contact with the base or the first elastic arm. In certain embodiments, the electrical terminal further has a third elastic arm, a lower end of the third elastic arm is integrally connected to the base and an upper end is integrally connected to the first elastic arm, the first elastic arm and the third elastic arm are located at a left side and a right side of the second elastic arm, a first torn surface is provided on one side of the first elastic arm adjacent to the second elastic arm, a second torn surface is provided on one side of the third elastic arm adjacent to the second elastic arm, and two opposite sides of the second elastic arm are formed correspondingly by tearing from the first torn surface and the second torn surface. In certain embodiments, a torn surface is provided on one side of the first elastic arm adjacent to the second elastic arm, the second elastic arm is formed by tearing from the torn surface; the first elastic arm further has a blanking surface, the blanking surface is formed by blanking the second elastic arm, and the blanking surface has an arc surface connected to the torn surface. In certain embodiments, the first end is the lower end of the through groove, the second end is the upper end of the through groove, the third end is the lower end of the second elastic arm, the fourth end is the upper end of the second elastic arm, and the first elastic arm has a contact surface overlapping with the contact portion in a vertical direction, such that the contact portion upwardly abuts the contact surface. In certain embodiments, the first end is the upper end of the through groove, the second end is the lower end of the through groove, the third end is the upper end of the second elastic arm, the fourth end is the lower end of the second elastic arm, and the contact portion abuts a front surface of the base. In certain embodiments, when the chip module does not downwardly abut the mating portion, the contact portion does not abut the base. In certain embodiments, the first elastic arm has a vertical portion, and the vertical portion and the strip connecting portion are provided side by side in a left-right direction. In certain embodiments, the first elastic arm has a main body portion and an upper portion formed by extending upwardly from the main body portion, the second elastic arm has a first portion and a second portion formed by extending downwardly from the first portion, the second portion is located in front of the main body portion, and the mating portion, the upper portion of the first elastic arm and the first portion of the second elastic arm are located on a same plane. In certain embodiments, the second portion has a first section formed by bending forwardly from the first portion and extending downwardly, a second section formed by bending backwardly from the first section and extending downwardly, and the contact portion formed by bending forwardly from the second section and extending downwardly. In certain embodiments, two adjacent electrical terminals of the electrical terminals in a front-rear direction are provided to be staggered in the front-rear direction, and viewing from a lateral direction, the second elastic arm of a rear electrical terminal of the two adjacent electrical terminals in the front-rear direction and the first elastic arm of a front electrical terminal of the two adjacent electrical terminals in the front-rear direction at least partially overlap with each other. The present invention further provides an electrical connector, which includes: a body; and a plurality of electrical terminals, accommodated in the body, wherein each of the electrical terminals comprises: a base; an elastic arm formed by extending upwardly from the base, wherein a through groove runs through the elastic arm along a thickness direction of the elastic arm, such that the elastic arm forms two branches at a left side and a right side of the through groove; and a soft portion integrally connecting an upper end and a lower end of the through groove, wherein the two branches are located at a left side and a right side of the soft portion, an average width of the soft portion is less than 1.5 times a thickness of the soft portion, a softness of the soft portion is greater than a softness of the two branches, and the soft portion protrudes forwardly relative to the two branches; wherein the elastic arm has a mating portion in front of the through groove and configured to upwardly abut a chip module. In certain embodiments, two adjacent electrical terminals of the electrical terminals in a front-rear direction are provided to be staggered in the front-rear direction, and viewing from a lateral direction, the soft portion of a rear electrical terminal of the two adjacent electrical terminals in the front-rear direction and the branches of a front electrical terminal of the two adjacent electrical terminals in the front-rear direction at least partially overlap with each other. In certain embodiments, each of the electrical terminals further has two strip connecting portions configured to be connected to a same strip, the two strip connecting portions extend upwardly from an upper end of the base and are located at a left side and a right side of the elastic arm, and a maximum distance between two side edges of the two branches away from the soft portion is greater than a distance between two side edges of the two strip connecting portions adjacent to the soft portion and is less than a distance between two side edges of the two strip connecting portions away from the soft portion. Compared with the related art, the electrical terminal and the electrical connector according to certain embodiments of the present invention have the following beneficial effects. The second portion of the second elastic arm or the second branch is located in front of the main body portion of the first elastic arm or the first branch, which is equivalent to increasing a thickness of the elastic arm in the front-rear direction, thus increasing the capacitance of the electrical terminal, thereby reducing the impedance of the electrical terminal, and further improving the high frequency performance of the electrical terminal. These and other aspects of the present invention will become apparent from the following description of the preferred embodiment taken in conjunction with the following drawings, although variations and modifications therein may be effected without departing from the spirit and scope of the novel concepts of the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings illustrate one or more embodiments of the disclosure and together with the written description, serve to explain the principles of the disclosure. Wherever possible, the same reference numbers are used throughout the drawings to refer to the same or like elements of an embodiment, and wherein: FIG. 1 is a schematic perspective view of an electrical terminal before being formed according to a first embodiment of the present invention. FIG. 2 is a schematic perspective view of the electrical terminal in FIG. 1 after being formed. FIG. 3 is a back view of FIG. 2 . FIG. 4 is a sectional view of FIG. 3 along the A-A direction. FIG. 5 is a top view of FIG. 2 . FIG. 6 is a schematic perspective view of an electrical terminal before being formed according to a second embodiment of the present invention. FIG. 7 is a schematic perspective view of the electrical terminal in FIG. 6 being connected to a strip after being formed. FIG. 8 is a schematic perspective view of the electrical terminal according to the second embodiment of the present invention. FIG. 9 is a top view of FIG. 8 . FIG. 10 is a sectional view of FIG. 9 along the B-B direction. FIG. 11 is a schematic perspective view of an electrical connector according to a third embodiment of the present invention. FIG. 12 is a plain view of an electrical terminal before being formed according to the third embodiment of the present invention. FIG. 13 is a schematic perspective view of the electrical terminal in FIG. 12 after being formed. FIG. 14 is a side view of FIG. 13 . FIG. 15 is a side view of the electrical connector (with the body being removed) according to the third embodiment of the present invention. FIG. 16 is a side view of FIG. 15 , where the chip module presses the electrical terminal downwardly to a final position. FIG. 17 is a schematic perspective view of an electrical connector according to a fourth embodiment of the present invention. FIG. 18 is a schematic perspective view of an electrical terminal according to the fourth embodiment of the present invention. FIG. 19 is a back view of FIG. 18 . FIG. 20 is a side view of FIG. 18 . FIG. 21 is a side view of the electrical connector (with the body being removed) according to the fourth embodiment of the present invention. FIG. 22 is a side view of FIG. 21 , where the chip module presses the electrical terminal downwardly to a final position.

DETAILED DESCRIPTION

The present invention is more particularly described in the following examples that are intended as illustrative only since numerous modifications and variations therein will be apparent to those skilled in the art. Various embodiments of the invention are now described in detail. Referring to the drawings, like numbers indicate like components throughout the views. As used in the description herein and throughout the claims that follow, the meaning of “a”, “an”, and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein and throughout the claims that follow, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise. Moreover, titles or subtitles may be used in the specification for the convenience of a reader, which shall have no influence on the scope of the present invention. It will be understood that when an element is referred to as being “on” another element, it can be directly on the other element or intervening elements may be present therebetween. In contrast, when an element is referred to as being “directly on” another element, there are no intervening elements present. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. Furthermore, relative terms, such as “lower” or “bottom” and “upper” or “top,” may be used herein to describe one element's relationship to another element as illustrated in the Figures. It will be understood that relative terms are intended to encompass different orientations of the device in addition to the orientation depicted in the Figures. For example, if the device in one of the figures is turned over, elements described as being on the “lower” side of other elements would then be oriented on “upper” sides of the other elements. The exemplary term “lower”, can therefore, encompasses both an orientation of “lower” and “upper,” depending of the particular orientation of the figure. Similarly, if the device in one of the figures is turned over, elements described as “below” or “beneath” other elements would then be oriented “above” the other elements. The exemplary terms “below” or “beneath” can, therefore, encompass both an orientation of above and below. As used herein, “around”, “about” or “approximately” shall generally mean within 20 percent, preferably within 10 percent, and more preferably within 5 percent of a given value or range. Numerical quantities given herein are approximate, meaning that the term “around”, “about” or “approximately” can be inferred if not expressly stated. As used herein, the terms “comprising”, “including”, “carrying”, “having”, “containing”, “involving”, and the like are to be understood to be open-ended, i.e., to mean including but not limited to. The description will be made as to the embodiments of the present invention in conjunction with the accompanying drawings in FIGS. 1 - 22 . In accordance with the purposes of this invention, as embodied and broadly described herein, this invention, in one aspect, relates to an electrical terminal and an electrical connector. As shown in the drawings, an extending direction of the X-axis is defined as a front-rear direction (where the positive direction of the X-axis is a forward direction), an extending direction of the Y-axis is defined as a left-right direction (where the positive direction of the Y-axis is a rightward direction), and an extending direction of the Z-axis is defined as a vertical direction (where the positive direction of the Z-axis is an upward direction). FIG. 1 to FIG. 5 show an electrical terminal 100 according to a first embodiment of the present invention, which is used to electrically connect a chip module (not shown) and a circuit board (not shown). The electrical terminal 100 is formed by stamping a metal plate. Each electrical terminal 100 includes a base 1 that is vertical flat plate shaped, and the base 1 has a vertical plain surface 11 . A first elastic arm 2 , a second elastic arm 3 , and a third elastic arm 4 are formed side by side by bending and extending upwardly from an upper end of the base 1 , and the second elastic arm 3 is located between the first elastic arm 2 and the third elastic arm 4 . The first elastic arm 2 has a first side and a second side, where the first side of the first elastic arm 2 is adjacent to the second elastic arm 3 , and the second side of the first elastic arm 2 is located away from the second elastic arm 3 . A strip connecting portion 5 is formed by vertically extending upwardly from the base 1 to be connected to a strip 7 , and the strip connecting portion 5 is located at the second side of the first elastic arm 2 . A pair of clamping portions 6 are formed by bending and extending downwardly from a lower end of the base 1 to jointly clamp a solder ball (not shown), which is used to be soldered to the circuit board. As shown in FIG. 2 and FIG. 4 , the first elastic arm 2 extends upwardly from the upper end of the base 1 toward a direction away from the vertical plain surface 11 , and bends and extends reversely to cross the vertical plain surface 11 . A first torn surface 22 is provided on the first side of the first elastic arm 2 . A protruding portion 21 laterally protrudes and extends from the first torn surface 22 , and the protruding portion 21 has a cutting surface 212 connected to the first torn surface 22 . A lower surface of the protruding portion 21 has a contact surface 211 , and the contact surface 211 is arc shaped. A top portion of the first elastic arm 2 is provided with a mating portion 23 to upwardly abut the chip module, and the mating portion 23 is connected to the contact surface 211 . The first elastic arm 2 has a connecting portion 24 connected to the upper end of the base 1 , and the connecting portion 24 and the protruding portion 21 are located at two opposite sides of the base 1 . As shown in FIG. 2 to FIG. 4 , the third elastic arm 4 bends and extends from the upper end of the base 1 to the protruding portion 21 . A second torn surface 41 is provided on one side of the third elastic arm 4 adjacent to the second elastic arm 3 . The third elastic arm 4 and the first elastic arm 2 are provided in parallel, and the structure of the first elastic arm 2 from the protruding portion 21 to the upper end of the base 1 is the identical to that of the third elastic arm 4 . As shown in FIG. 2 to FIG. 4 , a junction between the second elastic arm 3 and the base 1 and a junction between the first elastic arm 2 and the base 1 are provided side by side. The second elastic arm 3 extends upwardly from the upper end of the base 1 toward a direction away from the vertical plain surface 11 , and bends and extends reversely direction to cross the vertical plain surface 11 . A width of the second elastic arm 3 gradually decreases along an upward-from-bottom direction. The second elastic arm 3 has a contact portion 31 , and the contact portion 31 is flat plate shaped. The contact portion 31 and the contact surface 211 overlap with each other vertically, and the contact portion 31 upwardly abuts the contact surface 211 . When the chip module presses downwardly on the mating portion 23 , the contact portion 31 can move on the contact surface 211 . Therefore, the chip module does not need to press downwardly on the mating portion 23 with a relatively large pressure. The second elastic arm 3 is connected to the cutting surface 212 before being formed (as shown in FIG. 1 ). During forming, a tail end of the second elastic arm 3 is cut off from the cutting surface 212 , and two opposite sides of the second elastic arm 3 are formed by tearing from the first torn surface 22 and the second torn surface 41 , such that the width of the second elastic arm 3 is equal to a gap width between the first elastic arm 2 and the third elastic arm 4 , and a length of the second elastic arm 3 is equal to a length of the first elastic arm 2 from the cutting surface 212 to the upper end of the base 1 . In another embodiment, the tail end of the second elastic arm 3 can be cut off from the protruding portion 21 through blanking, and therefore, the length of the first elastic arm 2 from the cutting surface 212 to the upper end of the base 1 is greater than the length of the second elastic arm 3 . The second elastic arm 3 has an extending portion 32 connected to the upper end of the base 1 . The extending portion 32 and the contact portion 31 are located at two opposite sides of the base 1 , and the connecting portion 24 and the extending portion 32 are located at a same side of the base 1 . A bending angle A of the extending portion 32 relative to the base 1 is smaller than a bending angle B of the connecting portion 24 relative to the base 1 . FIG. 6 to FIG. 10 show an electrical terminal 100 ′ according to a second embodiment of the present invention. The electrical terminal 100 ′ is used to electrically connect a chip module (not shown) and a circuit board (not shown). The electrical terminal 100 ′ is formed by stamping a metal plate. Each electrical terminal 100 ′ includes a base 1 ′ that is vertically flat plate shaped, and the base 1 ′ has a vertical plain surface 11 ′. A first elastic arm 2 ′ and a second elastic arm 3 ′ are formed by bending and extending upwardly from an upper end of the base 1 ′. The first elastic arm 2 ′ has a first side and a second side, where the first side of the first elastic arm 2 ′ is adjacent to the second elastic arm 3 ′, and the second side of the first elastic arm 2 ′ is located away from the second elastic arm 3 ′. A strip connecting portion 5 ′ is formed by bending from one side of the base 1 ′ to be connected to a strip 7 ′, and the strip connecting portion 5 ′ is located at the second side of the first elastic arm 2 ′. A first clamping arm 61 is formed by tearing, bending, and extending from a center of a lower end of the base 1 ′ to one side, such that a second clamping arm 62 is formed at each of two opposite sides of the first clamping arm 61 . The first clamping arm 61 and the two second clamping arms 62 jointly clamp a solder ball (not shown) to be soldered to the circuit board. As shown in FIG. 7 to FIG. 9 , the first elastic arm 2 ′ bends and extends from the upper end of the base 1 ′ to one side of the vertical plain surface 11 ′. A torn surface 22 ′ is provided on the first side of the first elastic arm 2 ′. A protruding portion 21 ′ laterally protrudes and extends from the torn surface 22 ′, and the protruding portion 21 ′ has a cutting surface 212 ′ connected to the torn surface 22 ′. A length of the first elastic arm 2 ′ from the cutting surface 212 ′ to the upper end of the base 1 ′ is greater than or equal to a length of the second elastic arm 3 ′. A lower surface of the protruding portion 21 ′ has a contact surface 211 ′ (as shown in FIG. 10 ). A top portion of the first elastic arm 2 ′ is provided with a mating portion 23 ′ to upwardly abut the chip module. As shown in FIG. 8 and FIG. 9 , a junction between the second elastic arm 3 ′ and the base 1 ′ and a junction between the first elastic arm 2 ′ and the base 1 ′ are provided side by side. The second elastic arm 3 ′ bends and extends from the upper end of the base 1 ′ to one side of the vertical plain surface 11 ′. A bending angle of the second elastic arm 3 ′ relative to the base 1 ′ is smaller than a bending angle of the first elastic arm 2 ′ relative to the base 1 ′. The second elastic arm 3 ′ has a contact portion 31 ′, and the contact portion 31 ′ is flat plate shaped. The contact portion 31 ′ and the contact surface 211 ′ overlap in a vertical direction, and the contact portion 31 ′ upwardly abuts the contact surface 211 ′. When the chip module presses downwardly on the mating portion 23 ′, the contact portion 31 ′ can move on the contact surface 211 ′. Therefore, the chip module does not need to press downwardly on the mating portion 23 ′ with a relatively large pressure. The second elastic arm 3 ′ is connected to the cutting surface 212 ′ before being formed (as shown in FIG. 6 ). During forming, a tail end of the second elastic arm 3 ′ is cut off from the cutting surface 212 ′, and the second elastic arm 3 ′ is formed at one side adjacent to the first elastic arm 2 ′ by slitting from the torn surface 22 ′. FIG. 11 to FIG. 14 show an electrical connector P according to a third embodiment of the present invention. The electrical connector P includes a body P 200 and a plurality of electrical terminals P 100 accommodated in the body P 200 . The electrical terminals P 100 are used to electrically connect a chip module Q to a circuit board O. The body P 200 has a plurality of accommodating holes P 201 running vertically therethrough, and the electrical terminals P 100 are correspondingly accommodated in the accommodating holes P 201 . As shown in FIG. 12 , FIG. 13 and FIG. 15 , the electrical terminals P 100 are formed by punching a metal plate. Each electrical terminal P 100 includes a base P 1 being vertical flat plate shaped. A first elastic arm P 2 is formed by bending and extending upwardly from an upper end of the base P 1 . A top portion of the first elastic arm P 2 has a mating portion P 20 configured to upwardly abut the chip module Q. A through groove P 5 runs through the first elastic arm P 2 along a thickness direction of the first elastic arm P 2 . An upper end of the through groove P 5 is defined as a first end P 51 , and a lower end of the through groove P 5 is defined as a second end P 52 . A second elastic arm P 3 is located at a right side of the first elastic arm P 2 . An upper end of the second elastic arm P 3 is defined as a third end P 31 , and a lower end of the second elastic arm P 3 is defined as a fourth end P 32 . The third end P 31 is integrally connected to the first end P 51 . The fourth end P 32 is integrally connected to the second end P 52 prior to being formed, and the fourth end P 32 is broken from the second end P 52 after being formed. A third elastic arm P 4 is provided. An upper end of the third elastic arm P 4 is integrally connected to the first elastic arm P 2 , and a lower end of the third elastic arm P 4 is integrally connected to the base P 1 . The first elastic arm P 2 and the third elastic arm P 4 are located at a left side and a right side of the second elastic arm P 3 . A first torn surface P 21 is provided on a right side of the first elastic arm P 2 , and a second torn surface P 41 is provided on a left side of the third elastic arm P 4 . Two opposite sides of the second elastic arm P 3 are formed correspondingly by tearing from the first torn surface P 21 and the second torn surface P 41 . As shown in FIG. 14 to FIG. 16 , the lower end of the second elastic arm P 3 has a contact portion P 343 , and as shown in FIG. 13, the width of the contact portion P343 is greater than the width of the mating portion P20 . When the chip module Q does not downwardly abut the mating portion P 20 , the contact portion P 343 does not abut the base P 1 . That is, when the chip module Q starts to downwardly abut the mating portion P 20 , the chip module Q is not subject to a counter-acting force from the second elastic arm P 3 , reducing the normal force of the electrical terminal P 100 , such that the chip module Q presses downwardly on the electrical terminals P 100 more easily. When the chip module Q is pressed downwardly on the mating portion P 20 to a final position, the contact portion P 343 abuts a front surface of the base P 1 . Thus, three parallel conductive paths are formed between the chip module Q and the circuit board O. Further, the first elastic arm P 2 , the second elastic arm P 3 and the third elastic arm P 4 , which are sequentially arranged in the left-right direction, increase the width of each electrical terminal P 100 , thus increasing the capacitance of each electrical terminal P 100 , and thereby reducing the impedance of each electrical terminal P 100 . In other embodiments, when the chip module Q does not downwardly abut the mating portion P 20 , the contact portion P 343 may also abut the front surface of the base P 1 . As shown in FIG. 11 to FIG. 14 , the first elastic arm P 2 further has a first blanking surface P 22 located above the first torn surface P 21 . The first blanking surface P 22 is formed by blanking the second elastic arm P 3 . The first torn surface P21 protrudes from the first blanking surface P22 toward the second elastic arm P3, and the first blanking surface P22 is located above the first torn surface P21. The first blanking surface P 22 has a first arc surface P 220 connected to the first torn surface P 21 . The first arc surface P 220 may prevent the mold (not shown, same below) edge from being provided as a sharp angle at a connecting location of the first blanking surface P 22 and the first torn surface P 21 , thus increasing the usage life of the mold. Correspondingly, the third elastic arm P 4 has a second blanking surface P 42 located above the second torn surface P 41 . The second blanking surface P 42 is formed by blanking the second elastic arm P 3 . The second torn surface P41 protrudes from the second blanking surface P42 toward the second elastic arm P3, and the second blanking surface P42 is located above the second torn surface P41. The second blanking surface P 42 has a second arc surface P 420 connected to the second torn surface P 41 . As shown in FIG. 12 to FIG. 16, viewed from a left-right direction, there is a gap between the first elastic arm P2 and the second arm P3, a part of the solder ball P300 is under the gap. As shown in FIG. 11 to FIG. 14 , the first elastic arm P 2 has a first main body portion P 23 and a first upper portion P 25 formed by extending upwardly from the first main body portion P 23 . The first main body portion P 23 is integrally connected to the base P 1 . The first upper portion P 25 is integrally connected to the upper end of the through groove P 5 . The first main body portion P 23 has a first vertical portion P 24 . The third elastic arm P 4 has a second main body portion P 43 and a second upper portion P 45 formed by extending upwardly from the second main body portion P 43 . The second main body portion P 43 is integrally connected to the base P 1 . The second upper portion P 45 is integrally connected to the first main body portion P 23 . The second main body portion P 43 has a second vertical portion P 44 . The second elastic arm P 3 has a first portion P 33 and a second portion P 34 formed by extending downwardly from the first portion P 33 . The second portion P 34 is located in front of the first main body portion P 23 and the second main body portion P 43 , and a portion of the second elastic arm P3 between the fourth end P32 and the third end P31 is curved and is in front of the base P1, thereby being equivalent to increasing the width of each electrical terminal P 100 in the front-rear direction, thus increasing the capacitance of each electrical terminal P 100 , reducing the impedance of each electrical terminal P 100 , and improving the high frequency performance of each electrical terminal P 100 . The mating portion P 20 , the first upper portion P 25 of the first elastic arm P 2 , the second upper portion P 45 of the third elastic arm P 4 and the first portion P 33 of the second elastic arm P 3 are located on a same plane. The mating portion P 20 , the first upper portion P 25 , the second upper portion P 45 and the first portion P 33 , being located on the same plane, may be used to be clamped and fixed by the mold, thus facilitating punching and bending the metal plate to form the electrical terminals P 100 . The second portion P 34 includes a first section P 341 formed by bending forwardly from the first portion P 33 and extending downwardly, a second section P 342 formed by bending backwardly from the first section P 341 and extending downwardly, and the contact portion P 343 formed by bending forwardly from the second section P 342 and extending downwardly. Such configuration allows the contact portion P 343 to abut the front surface of the base P 1 , thereby forming the three conductive paths, and reducing the impedance of each electrical terminal P 100 . As shown in FIG. 11 to FIG. 14 , two strip connecting portions P 8 are formed by extending upwardly from the upper end of the base P 1 . One of the strip connecting portions P 8 is located at a left side of the first elastic arm P 2 , and the other of the strip connecting portions P 8 is located at a right side of the third elastic arm P 4 . The two strip connecting portions P 8 are used to be connected to a same strip P 7 , and are used for inserting the electrical terminal P 100 into the body P 200 . The top end of the strip connecting portions P8 are roughly flush with the top end of the accommodating hole P201, and the bottom end of the first torn surface P21 and the second torn surface P41 are lower than the top end of the strip connecting portions P8. That is, the bottom end of the first torn surface P21 and the second torn surface P41 are lower than the accommodating hole P201. The base P 1 is positioned in the body P 200 , and on the premise of satisfying the elastic requirement of the electrical terminal P 100 , the space occupied by the electrical terminal P 100 in the front-rear direction is not additionally increased. The first vertical portion P 24 and a corresponding one of the strip connecting portions P 8 are provided side by side in the left-right direction, and the second vertical portion P 44 and a corresponding one of the strip connecting portions P 8 are provided side by side in the left-right direction. Further, the first vertical portion P 24 is formed by tearing from the corresponding one of the strip connecting portions P 8 , and the second vertical portion P 44 is formed by tearing from the corresponding one of the strip connecting portions P 8 , such that on the premise of the capacitance of the electrical terminal P 100 being proper, the width of the electrical terminal P 100 is not additionally increased. The lower side of each electrical terminal P 100 further has two clamping portions P 6 to jointly clamp a solder ball P 300 to be soldered to the circuit board O. The two clamping portions P 6 are located at a front side of the base P 1 . The two clamping portions P 6 , the first elastic arm P 2 , the second elastic arm P 3 and the third elastic arm P 4 are located at a same side of the base P 1 , which is conducive to reducing the space occupied by each electrical terminal P 100 in the front-rear direction, and facilitating dense arrangement of the electrical terminals P 100 . Before and after the chip module Q downwardly abuts the electrical terminals P 100 , there is no contact between the second elastic arm P 3 and the two clamping portions P 6 as well as the solder ball P 300 , thus preventing the second elastic arm P 3 from abutting the clamping portions P 6 or the solder ball P 300 and causing an excessively large normal force of each electrical terminal P 100 . In this embodiment, each electrical terminal P 100 is soldered to the circuit board O by the clamping portions P 6 clamping the solder ball P 300 . In other embodiments, each electrical terminal P 100 may form an elastic portion (not shown) by bending and extending downwardly from the base P 1 to downwardly elastically abut the circuit board O. As shown in FIG. 15 and FIG. 16 , of the electrical terminals P 100 , two adjacent electrical terminals P 100 in the front-rear direction are provided to be staggered in the front-rear direction. Viewing from a lateral direction, the second elastic arm P 3 of a rear electrical terminal P 100 of the two adjacent electrical terminals P 100 in the front-rear direction and the first elastic arm P 2 of a front electrical terminal P 100 of the two adjacent electrical terminals P 100 in the front-rear direction partially overlap with each other. In this embodiment, the electrical terminals P 100 are arranged in multiple rows in the front-rear direction and the left-right direction, but the two adjacent rows of the electrical terminals P 100 in the front-rear direction are provided to be staggered, and the second elastic arm P 3 of the electrical terminal P 100 in a back row and the first elastic arm P 2 of the electrical terminal P 100 in a front row partially overlap with each other. Such configuration reduces the distance between the adjacent electrical terminals P 100 in the front-rear direction, thus facilitating the dense arrangement of the electrical terminals P 100 , and is conducive to increasing the capacitance of each electrical terminal P 100 and reducing the impedance of each electrical terminal P 100 . FIG. 17 , FIG. 18 and FIG. 22 show an electrical connector R according to a fourth embodiment of the present invention, which is used to electrically connect a chip module S to a circuit board T. The electrical connector R includes a body R 200 and a plurality of electrical terminals R 100 accommodated in the body R 200 . The body R 200 has a plurality of accommodating holes R 201 running vertically therethrough, and the electrical terminals R 100 are correspondingly accommodated in the accommodating holes R 201 . The electrical terminals R 100 are formed by punching a metal plate. Each electrical terminal R 100 includes a base R 1 being vertical flat plate shaped. An elastic arm R 2 is formed by extending upwardly from the base R 1 , where a through groove R 3 runs through the elastic arm R 2 along a thickness direction of the elastic arm R 2 , and the elastic arm R 2 forms two branches R 4 at a left side and a right side of the through groove R 3 . A soft portion R 5 is integrally connecting an upper end and a lower end of the through groove R 3 , where the two branches R 4 are located at a left side and a right side of the soft portion R 5 . The elastic arm R 2 has a mating portion R 6 in front of the through groove R 3 , which is used to upwardly abut the chip module S. As shown in FIG. 18 to FIG. 21 , in the left-right direction, the two branches R 4 and the soft portion R 5 increase the width of each electrical terminal R 100 . The soft portion R 5 protrudes forwardly relative to the two branches R 4 , thus increasing the thickness of each electrical terminal R 100 in the front-rear direction, increasing the capacitance of each electrical terminal R 100 , and reducing the impedance of each electrical terminal R 100 . An average width of the soft portion R 5 is less than 1.5 times a thickness of the soft portion R 5 (in this embodiment, the width of the soft portion R 5 is consistent, and the width and the thickness of the soft portion R 5 are equal), and the width of the soft portion R 5 is less than the width of any of the branches R 4 . A softness of the soft portion R 5 is greater than the softness of the two branches R 4 . Thus, the normal force of the soft portion R 5 is smaller, such that the chip module S presses downwardly on the electrical terminals R 100 more easily. Each electrical terminal R 100 form three conductive paths, which is conducive to reducing the impedance of each electrical terminal R 100 . Each electrical terminal R 100 further has two clamping portions R 8 to jointly clamp a solder ball R 300 to solder the electrical terminal R 100 to the circuit board T. The two clamping portions R 8 are located at a front side of the base R 1 . The two clamping portions R 8 and the elastic arm R 2 are located at a same side of the base R 1 , which is conducive to reducing the space occupied by each electrical terminal R 100 in the front-rear direction, and facilitating dense arrangement of the electrical terminals R 100 . There is no contact between the soft portion R 5 and the two clamping portions R 8 . As shown in FIG. 18 to FIG. 21 , each electrical terminal R 100 further has two strip connecting portions R 7 , which are used to be connected to a same strip (not shown). The two strip connecting portions R 7 extend upwardly from an upper end of the base R 1 and are located at a left side and a right side of the elastic arm R 2 . A maximum distance between two side edges of the two branches R 4 away from the soft portion R 5 is greater than a distance between two side edges of the two strip connecting portions R 7 adjacent to the soft portion R 5 and is less than a distance between two side edges of the two strip connecting portions R 7 away from the soft portion R 5 . In a lateral direction, the distance between the two branches R 4 is larger, which is conducive to increasing the capacitance of each electrical terminal R 100 . Further, each branch R 4 does not pass outwardly beyond the corresponding one of the strip connecting portions R 7 , and does not additionally increase the width of each electrical terminal R 100 , thus reducing the space occupied by the electrical connector R. As shown in FIG. 21 and FIG. 22 , of the electrical terminals R 100 , two adjacent electrical terminals R 100 in the front-rear direction are provided to be staggered in the front-rear direction. Viewing from the lateral direction, the soft portion R 5 of a rear electrical terminal R 100 of the two adjacent electrical terminals R 100 in the front-rear direction and the branches R 4 of a front electrical terminal R 100 of the two adjacent electrical terminals R 100 in the front-rear direction partially overlap with each other. In this embodiment, the electrical terminals R 100 are arranged in multiple rows in the front-rear direction and the left-right direction, but the two adjacent rows of the electrical terminals R 100 in the front-rear direction are provided to be staggered, and the soft portion R 5 of the electrical terminal R 100 in a back row and the branches R 4 of the electrical terminal R 100 in a front row partially overlap with each other. Such configuration reduces the distance between the electrical terminals R 100 of the adjacent rows in the front-rear direction, thus facilitating the dense arrangement of the electrical terminals R 100 , and is conducive to increasing the capacitance of each electrical terminal R 100 and reducing the impedance of each electrical terminal R 100 . To sum up, the electrical terminal and the electrical connector according to certain embodiments of the present invention have the following beneficial effects: (1) The protruding portion 21 protrudes and extends from the side of the first elastic arm 2 adjacent to the second elastic arm 3 . The lower surface of the protruding portion 21 has the contact surface 211 overlapping the contact portion 31 in the vertical direction. The contact portion 31 upwardly abuts the contact surface 211 . When the chip module presses downwardly on the electrical terminal 100 , the contact portion 31 can move on the contact surface 211 . Therefore, the chip module does not need to press downwardly on the mating portion 23 with a relative large pressure. (2) The second elastic arm 3 is firstly cut off from the protruding portion 21 , and then formed by tearing from the first torn surface 22 and the second torn surface 41 . That is, compared with the related art, the second elastic arm 3 uses a material for forming the through groove in the related art, thereby reducing material wastes and costs. In addition, widths of the first elastic arm 2 and the third elastic arm 4 are made relatively large when the materials are the same and the width of the second elastic arm 3 remains unchanged, thereby improving high-frequency performance of the electrical terminal 100 . (3) Due to the existence of the first elastic arm 2 , the second elastic arm 3 , and the third elastic arm 4 , a first conductive path sequentially passing through the mating portion 23 , the first elastic arm 2 , and the base 1 , a second conductive path sequentially passing through the mating portion 23 , the second elastic arm 3 , and the base 1 , and a third conductive path sequentially passing through the mating portion 23 , the third elastic arm 4 , and the base 1 are formed between the chip module and the circuit board. The three conductive paths are connected in parallel to one another, reducing impedance during telecommunication transmission between the chip module and the circuit board, thereby improving high-frequency performance. (4) Three parallel conductive paths are formed between the chip module Q and the circuit board O, thus reducing the impedance of each electrical terminal P 100 . Further, the first elastic arm P 2 , the second elastic arm P 3 and the third elastic arm P 4 , which are sequentially arranged in the left-right direction, increase the width of each electrical terminal P 100 . The second portion P 34 is located in front of the first main body portion P 23 and the second main body portion P 43 , thereby being equivalent to increasing the width of each electrical terminal P 100 in the front-rear direction, thus increasing the capacitance of each electrical terminal P 100 , and reducing the impedance of each electrical terminal P 100 , which is conducive to transmission of high frequency signals. (5) The mating portion P 20 , the first upper portion P 25 of the first elastic arm P 2 , the second upper portion P 45 of the third elastic arm P 4 and the first portion P 33 of the second elastic arm P 3 are located on a same plane. The mating portion P 20 , the first upper portion P 25 , the second upper portion P 45 and the first portion P 33 , being located on the same plane, may be used to be clamped and fixed by the mold, thus facilitating punching and bending the metal plate to form the electrical terminals P 100 . (6) Each electrical terminal R 100 has two branches R 4 and a soft portion R 5 . When the chip module S presses downwardly on the electrical terminals R 100 , each electrical terminal R 100 forms three conductive paths, thus reducing the impedance of each electrical terminal R 100 . Further, the soft portion R 5 protrudes forwardly relative to the two branches R 4 , increasing the thickness of each electrical terminal R 100 , increasing the capacitance of each electrical terminal R 100 , and reducing the impedance of each electrical terminal R 100 . Since the soft portion R 5 is soft, the normal force of the soft portion R 5 is smaller, which almost does not generate a counter-acting force to the chip module S, such that the chip module S presses downwardly on the electrical terminals R 100 more easily. The foregoing description of the exemplary embodiments of the invention has been presented only for the purposes of illustration and description and is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to explain the principles of the invention and their practical application so as to activate others skilled in the art to utilize the invention and various embodiments and with various modifications as are suited to the particular use contemplated. Alternative embodiments will become apparent to those skilled in the art to which the present invention pertains without departing from its spirit and scope. Accordingly, the scope of the present invention is defined by the appended claims rather than the foregoing description and the exemplary embodiments described therein.