# US 5,353,193 A · High power dissipating packages with matched heatspreader heatsink assemblies > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,353,193 A - Document ID: US5353193A - Status: Granted - Kind: A - Application number: 08/023,981 - Filed: 1993-02-26 - Granted: 1994-10-04 - Earliest claimed: 1993-02-26 - Assignees: LSI Logic Corporation - Inventors: Chok J. Chia; Manian Alagaratnam; Qwai H. Low; Seng-Sooi Lim - Web page: https://patentgrep.com/patent/US5353193A ## CPC - H10W 40/60: Securing means for detachable heating or cooling arrangements, e.g. clamps - F02F 7/00: Casings, e.g. crankcases - H10W 40/22: characterised by their shape, e.g. having conical or cylindrical projections - Y10T 29/4913: Assembling to base an electrical component, e.g., capacitor, etc. - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 - F02F: CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A removable heatsink assembly comprised of a heatsink unit and a heatspreader is provided. The heatsink unit has at least one fin and a coupling collar for radiating heat away from a packaged electronic device. The heatspreader includes a platform attached to an inner collar in thermal contact with the packaged electronic device. The platform has one or more tabs suitable for mating with one or more flanges located on the coupling collar of the heatsink unit. Coupling grooves within the flanges engage the platform of the heatspreader when the flanges are mated with the heatspreader tabs and the heatsink is turned. The heatsink can therefore be quickly and conveniently attached to or removed from the heatspreader. The present invention thus permits a wide variety of different heatsinks to be interchangeably used with a single heatspreader attached to an electronic device package. ## Claims ### Claim 1 A heatsink assembly for radiating heat away from a packaged electronic device comprising: a removable heatsink unit, said unit having at least one fin and a coupling collar; a heatspreader having a platform, at least one tab and an inner collar, said platform being attached to said inner collar and said tab being disposed along the periphery of said platform, said heatspreader adapted to be in thermal contact with the packaged electronic device and adapted to receive a portion of said coupling collar of said heatsink unit within said tab such that when said heatsink unit is turned, said coupling collar removably engages said platform of said heatspreader, thereby removably coupling said heatsink unit to said heatspreader. ### Claim 2 (depends on 1) The heatsink assembly of claim 1 wherein said portion of said coupling collar of said heatsink unit comprises at least one flange having an inner coupling groove. ### Claim 3 (depends on 2) The heatsink assembly of claim 2 wherein said flange engages said tab and said inner coupling groove within said flange tightens about said platform as said heatsink unit is turned while said flange engages said tab. ### Claim 4 (depends on 2) The heatsink assembly of claim 2 wherein said coupling collar includes two of said flanges, each of said flanges having an inner coupling groove, and further wherein said heatspreader includes two tabs, each of said tabs adapted for receiving one of said flanges. ### Claim 5 (depends on 4) The heatsink assembly of claim 4 wherein said two flanges are arranged on opposite sides of said coupling collar and said two tabs are arranged on opposite sides of said platform. ### Claim 6 (depends on 1) The heatsink assembly of claim 1 wherein said coupling collar of said heatsink unit is comprised of copper. ### Claim 7 (depends on 1) The heatsink assembly of claim 1 wherein said inner collar of said heatspreader is comprised of copper. ### Claim 8 (depends on 1) The heatsink assembly of claim 1 wherein said fin of said heatsink unit is comprised of aluminum. ### Claim 9 (depends on 1) The heatsink assembly of claim 1 wherein said coupling collar of said heatsink unit and said platform of said heatspreader are circular in shape. ### Claim 10 (depends on 2) The heatsink assembly of claim 2 wherein said inner coupling groove has a ramp-like surface. ### Claim 11 (depends on 1) The heatsink assembly of claim 1 wherein a portion of said heatspreader is adapted to be disposed with the package. ### Claim 12 A heatsink assembly comprising: a removable heatsink unit, said unit having a coupling collar; a heatspreader having a platform and at least one tab, said tab being disposed along the periphery of said platform, and adapted to receive a portion of said coupling collar of said heatsink unit within said tab such that when said heatsink unit is turned, said coupling collar removably engages said platform of said heatspreader, thereby removably coupling said heatsink unit to said heatspreader. ### Claim 13 (depends on 12) The heatsink assembly of claim 12 wherein said portion of said coupling collar of said heatsink unit comprises at least one flange having an inner coupling groove. ### Claim 14 (depends on 13) The heatsink assembly of claim 13 wherein said flange engages said tab and said inner coupling groove within said flange tightens about said platform as said heatsink unit is turned while said flange engages said tab. ### Claim 15 (depends on 13) The heatsink assembly of claim 13 wherein said coupling collar includes two of said flanges, each of said flanges having an inner coupling groove, and further wherein said heatspreader includes two tabs, each of said tabs adapted for receiving one of said flanges. ### Claim 16 (depends on 12) The heatsink assembly of claim 12 wherein said coupling collar of said heatsink unit is comprised of copper. ### Claim 17 (depends on 12) The heatsink assembly of claim 12 wherein said platform of said heatspreader is comprised of copper. ### Claim 18 (depends on 12) The heatsink assembly of claim 12 wherein said coupling collar of said heatsink unit and said platform of said heatspreader are circular in shape.