Flexible press fit pins for semiconductor packages and related methods

• US 10,224,655 B2
• Filed: 02/27/2017
• Issued: 03/05/2019
• Est. Priority Date: 06/17/2014
• Status: Active Grant

• Current Assignee: Semiconductor Components Industries LLC (ON Semiconductor Corporation)
• Original Assignee: Semiconductor Components Industries LLC (ON Semiconductor Corporation)
• Inventors: Yao, Yushuang, Chew, Chee Hiong, Prajuckamol, Atapol
• Primary Examiner(s): Patel, Tulsidas C
• Assistant Examiner(s): Harcum, Marcus
• Application Number:
  US15/443,671
• Publication Number:
  US 20170170582A1
• Time in Patent Office: 736 Days
• Field of Search: 439700, 439824
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48227 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01R 12/57 surface mounting terminals
• CPC Class Codes: H01R 12/585 Terminals having a press fit or a compliant portion and a shank passing through a hole in the printed circuit board
• CPC Class Codes: H01R 13/05 Resilient pins or blades carrying separate resilient parts H01R13/15
• CPC Class Codes: H01R 43/02 for soldered or welded connections
• CPC Class Codes: H01R 43/16 for manufacturing contact members, e.g. by punching and by bending

Abstract

Implementations of pins for semiconductor packages may include: an upper contact portion having a contact surface configured to mechanically and electrically couple with a pin receiver; a lower portion having a vertical stop and at least two curved legs; a horizontal base coupled directly to the at least two curved legs and configured to be soldered to a substrate to mechanically and electrically couple the pin to the substrate, the horizontal base having an upper contact surface, and; a gap between a bottom contact surface of the vertical stop and the upper contact surface of the horizontal base; wherein the at least two curved legs are configured to flex to allow the bottom contact surface of the vertical stop to move toward the upper contact surface of the horizontal base in response to a pressure applied to the pin along a direction collinear with a longest length of the pin toward the upper contact surface, and; wherein the vertical stop is configured to stop movement of the pin when the bottom contact surface contacts the upper contact surface.

Claims

1. A method of manufacturing a pin for a semiconductor package, the method comprising:

providing a single sheet of metal;

stamping a pin from the single sheet of metal, the pin comprising a single layer of metal comprising an upper contact portion and a lower portion consisting of two partially curved legs; and

directly coupling the two curved legs to a horizontal base, the horizontal base configured to be soldered to a substrate to mechanically and electrically couple the pin to the substrate;

wherein the two curved legs are configured to deform in complementary opposing directions substantially perpendicular with a direction collinear with a longest length of the pin in response to a pressure applied to the pin along the direction collinear with a longest length of the pin toward the horizontal base.

2. The method of claim 1, wherein the two curved legs are directly coupled to the horizontal base through soldering.

3. The method of claim 1, wherein the upper contact portion comprises a deformable portion configured to deform along a direction substantially perpendicular with the longest length of the pin in response to inserting the upper contact portion into the pin receiver.

4. The method of claim 1, wherein the pin comprises a plurality of stops extending substantially perpendicular to the longest length of the pin and configured to prevent the pin from moving relative to a casing of a semiconductor package when the pin is removed from the pin receiver.

5. The method of claim 1, wherein a gap is present between the curves of the two curved legs.

6. The method of claim 5, wherein each of the curves of the two curved legs lie within one of two planes, wherein the two planes are substantially parallel.

7. The method of claim 1, wherein no gaps are visible between the two curved legs when the two curved legs are not under pressure.

8. A method of manufacturing a pin for a semiconductor package, the method comprising:

providing a single sheet of metal;

stamping a pin from the single flat sheet of metal, the pin comprising a single layer of metal including an upper contact portion and a lower contact portion comprising at least two partially curved legs;

bending the at least two partially curved legs in complementary opposing directions away from a longest length of the pin;

forming a plurality of stops in the pin through one of pressing or bending the stops into the upper portion of the pin, the plurality of stops extending substantially perpendicular to the longest length of the pin and configured to prevent the pin from moving relative to a casing of a semiconductor package when the pin is removed from the pin receiver; and

directly coupling a horizontal base to the at least two partially curved legs, the horizontal base configured to be soldered to a substrate to mechanically and electrically couple the pin to the substrate;

wherein the at least two partially curved legs are configured to deform in complementary opposing directions substantially perpendicular with a direction collinear with the longest length of the pin in response to a pressure applied to the pin along the direction collinear with the longest length of the pin toward the horizontal base.

9. The method of claim 8, wherein each of the at least two partially curved legs terminates in a vertical, non-curved portion coupled directly to the horizontal base.

10. The method of claim 9, wherein the pin comprises a gap between the at least two partially curved legs that is visible when the pin is viewed along a direction wherein the vertical, non-curved portion of one of the at least two partially curved legs is fully hidden behind the vertical, non-curved portion of the other of the at least two partially curved legs.

11. The pin of claim 8, wherein the upper contact portion comprises a deformable portion configured to deform along a direction substantially perpendicular with the longest length of the pin in response to inserting the upper contact portion into the pin receiver.

12. The pin of claim 8, wherein each of the at least two partially curved legs comprises only a single curve that is concave relative to the single curve of the other of the at least two partially curved legs.