Clamping heat sink

• US 5,611,393 A
• Filed: 02/23/1996
• Issued: 03/18/1997
• Est. Priority Date: 02/23/1996
• Status: Expired due to Fees

• Current Assignee: Wakefield Thermal Solutions, Inc. (The Heico Cos. LLC)
• Original Assignee: Wakefield Engineering, Inc.
• Inventors: Campanella, Vincent, Vasconcelos, Osvaldo M.
• Primary Examiner(s): Leo, Leonard R.
• Application Number:
  US08/609,770
• Time in Patent Office: 389 Days
• Field of Search: 165/80.3, 165/185, 174/16.3, 257/718, 257/719, 257/722, 361/702-704, 361/707
• US Class Current: 165/80.3
• CPC Class Codes: H01L 23/3672 Foil-like cooling fins or heat sinks being part of lead-frames H01L23/49568
• CPC Class Codes: H01L 23/4093 Snap-on arrangements, e.g. clips
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

A clamping heat sink formed of a thermally conductive material for releasable attachment to an electronic component. The clamping heat sink includes a horizontal base wall, a pair of vertical side walls extending upwardly from the base and a resiliently deflectable clamping element which extends downwardly from the top of each vertical wall into the rectangular channel which is formed by the base wall and vertical side walls. Each clamping element has an upper portion which extends downwardly at any angle toward the base wall and the opposite side wall and a lower portion which extends downwardly at an angle from the lower end of the upper portion toward its own side wall, the upper portion of the clamping element forming a juncture with the lower portion. Each vertical side wall has an opening which is horizontally aligned with its respective clamping element to enable the clamping element to be deflected into the opening when a semiconductor package is passed between the clamping elements, prior to positioning of the semiconductor package on the base wall of the clamping heat sink.

Claims

1. A clamping heat sink of thermally conductive material for releasable attachment to an electronic component having a bottom surface and a pair of opposite side surfaces, said clamping heat sink comprising:

(a) a horizontal base wall having a first side and a second side which is parallel to and opposite from said first side,

(b) a first vertical side wall which extends upwardly from the first side of said base, said first vertical side wall having an upper end,

(c) a second vertical side wall which extends upwardly from the second side of said base, said second vertical side wall having an upper end, said first and second vertical side walls defining with said base, a generally rectangular channel for receiving an electrical component;

(d) a first resiliently deflectable L-shaped clamping element which is connected to the upper end of said first vertical, said first L-shaped clamping element having an upper portion which extends downwardly from the top of said first vertical wall toward said second vertical wall to a lower end which extends downwardly from the lower end of said upper portion toward said first vertical wall, said lower portion forming a juncture with the lower end of said upper portion; and

(e) a second resiliently deflectable L-shaped clamping element which is connected to the upper end of said second vertical wall, said second L-shaped clamping element having an upper portion which extends downwardly from the top of said second vertical wall and into said channel toward said first vertical wall to a lower end and a lower portion which extends downwardly from the lower end of said second portion toward said second vertical wall, the lower portion of said second L-shaped clamping element forming a juncture with the upper portion of said second L-shaped clamping element.

2. A clamping heat sink as recited in claim 1, further comprising:

(a) a first heat dissipating fin connected to said first vertical side wall; and

(b) a second heat dissipating fin connected to said second vertical side wall.

3. A clamping heat sink as recited in claim 2, wherein each of said first and second heat dissipating fins comprises:

(a) a horizontal top portion which extends away from said U-shaped channel from the top of it'"'"'s respective vertical side wall; and

(b) a vertical outer portion which extends downwardly from said top portion and spaced from it'"'"'s respective vertical side wall.

4. A clamping heat sink as recited in claim 1, wherein said clamping heat sink further comprises at least one projection which extends upwardly from said horizontal base wall for engaging one end of an electrical component which is placed on said base wall for locating said electrical component in a predetermined position on said base wall.

5. A clamping heat sink as recited in claim 4, wherein said channel has a first open end and a second open end which is opposite said first open end, and wherein said projection is adjacent said second open end and said first and second clamping elements are adjacent said first open end.

6. A clamping heat sink as recited in claim 5, wherein said first clamping element is horizontally aligned with said second clamping element.

7. A clamping heat sink as recited in claim 4, wherein said projection is an elongated tab which extends upwardly from said base wall adjacent one end of said channel toward the opposite end of said channel, said tab having a lower portion which is at an acute angle to said base wall and an upper portion which is at an acute angle to said base wall and terminates in a free end, the angle of the upper portion of said tab being substantially less than the angle of the lower portion of said tab.

8. A clamping heat sink of thermally conductive material for releasable attachment to an electrical component having a bottom surface and a pair of opposite side surfaces, said clamping heat sink comprising:

(a) a horizontal base wall having a first side and a second side which is parallel to and opposite from said first side,

(b) a first vertical wall which extends upwardly from the first side of said base, said first vertical wall having an upper end and a first opening which is spaced from said base wall and said upper end,

(c) a second vertical wall which extends upwardly from the second side of said base, said second vertical wall having an upper end and a second opening which is spaced from said base wall and the upper end of said second vertical wall, said first and second vertical walls defining with said base, a U-shaped channel for receiving an electrical component;

(d) a first resiliently deflectable clamping element which is connected to the upper end of said first vertical wall, said first clamping element extending downwardly from the top of said first vertical wall into said channel and toward said second vertical wall to a lower end, said first clamping element being horizontally aligned with said first opening for enabling said first clamping element to be deflected at least partially into said first opening; and

(e) a second resiliently deflectable clamping element which is connected to the upper end of said second vertical wall, said second clamping element extending downwardly from the top of said second vertical wall into said channel and toward said first vertical wall, said first clamping element being horizontally aligned with said second opening for enabling said second clamping element to be deflected at least partially into said second opening.

9. A clamping heat sink as recited in claim 8, wherein the lower end of said first clamping element has a first lip which extends downwardly and towards said first vertical wall, and the lower end of said second clamping element has a second lip which extends downwardly and towards said second vertical wall, each of said first and second lips being spaced from said base wall.

10. A clamping heat sink as recited in claim 9, wherein said first and second lips is elongated and has a free end which is located at the opening in the adjacent one of said first and second vertical walls.

11. A clamping heat sink as recited in claim 8, further comprising:

(a) a first heat dissipating fin connected to said first vertical wall; and

(b) a second heat dissipating fin connected to said second vertical wall.

12. A clamping heat sink as recited in claim 11, wherein each of said first and second heat dissipating fins comprises:

(a) a horizontal top portion which extends away from said U-shaped channel from the top of it'"'"'s respective vertical wall; and

(b) a vertical outer portion which extends downwardly from said top portion and spaced from it'"'"'s respective vertical wall.

13. A clamping heat sink as recited in claim 8, wherein said clamping heat sink further comprises at least one projection which extends upwardly from said horizontal base wall for engaging one end of an electrical component which is placed on said base wall for locating said electrical component in a predetermined position on said base wall.

14. A clamping heat sink as recited in claim 13, wherein said projection is an elongated tab which extends upwardly from said base wall adjacent one end of said channel toward the opposite end of said channel, said tab having a lower portion which is an acute angle to said base wall and an upper portion which is an acute angle to said base wall and terminates in a free end, the angle of the upper portion of said tab being substantially less than the angle of the lower portion of said tab.

15. A clamping heat sink as recited in claim 8, wherein said channel has a first open end and a second open end which is opposite said first open end, and wherein said projection is adjacent said second open end and said first and second clamping elements are adjacent said first open end.

16. A clamping heat sink as recited in claim 15, wherein said first clamping element is horizontally aligned with said second clamping element.