Heat Sinks

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Mfr Part #	Quantity Available	Price	Series	Package	Product Status	Type	Package Cooled	Attachment Method	Shape	Length	Width	Diameter	Fin Height	Power Dissipation @ Temperature Rise	Thermal Resistance @ Forced Air Flow	Thermal Resistance @ Natural	Material	Material Finish
HSS-B20-NP-06 HEATSINK TO-220 2.9W ALUMINUM Same Sky (Formerly CUI Devices)	1,619 In Stock	1 : $0.58000 Bag	HSS	Bag	Active	Board Level	TO-220	Bolt On	Square, Fins	0.748" (19.00mm)	0.748" (19.00mm)	-	0.375" (9.52mm)	2.9W @ 75°C	7.51°C/W @ 200 LFM	26.32°C/W	Aluminum	Black Anodized
HSS-B20-0953H-02 HEATSINK TO-220 2.9W ALUMINUM Same Sky (Formerly CUI Devices)	1,448 In Stock	1 : $0.73000 Bag	HSS	Bag	Active	Board Level, Vertical	TO-220	PC Pin	Rectangular, Fins	0.500" (12.70mm)	0.504" (12.80mm)	-	0.748" (19.00mm)	2.9W @ 75°C	7.24°C/W @ 200 LFM	25.92°C/W	Aluminum	Black Anodized
HSS-B20-0635H-01 HEATSINK TO-220 2.7W ALUMINUM Same Sky (Formerly CUI Devices)	9,193 In Stock	1 : $0.77000 Bag	HSS	Bag	Active	Board Level, Vertical	TO-220	PC Pin	Rectangular, Fins	0.520" (13.20mm)	0.375" (9.53mm)	-	0.748" (19.00mm)	2.7W @ 75°C	9.51°C/W @ 200 LFM	27.78°C/W	Aluminum	Black Anodized
HSS-B20-NP-04 HEATSINK TO-220 6.5W ALUMINUM Same Sky (Formerly CUI Devices)	4,743 In Stock	1 : $1.00000 Box	HSS	Box	Active	Board Level	TO-220	Bolt On	Rectangular, Fins	1.450" (36.83mm)	1.750" (44.45mm)	-	0.370" (9.40mm)	6.5W @ 75°C	3.76°C/W @ 200 LFM	11.54°C/W	Aluminum	Black Anodized
HSS-B20-NPR-02 HEATSINK TO-220 5.1W ALUMINUM Same Sky (Formerly CUI Devices)	1,235 In Stock	1 : $1.03000 Bag	HSS	Bag	Active	Board Level, Vertical	TO-220	Bolt On and Board Mounts	Rectangular, Fins	0.500" (12.70mm)	1.000" (25.40mm)	-	1.180" (29.97mm)	5.1W @ 75°C	4.20°C/W @ 200 LFM	14.71°C/W	Aluminum	Black Anodized
HSS-B20-NP-12 HEATSINK TO-220 6.8W ALUMINUM Same Sky (Formerly CUI Devices)	1,525 In Stock	1 : $1.06000 Bag	HSS	Bag	Active	Board Level	TO-220	Bolt On	Rectangular, Fins	1.450" (36.83mm)	0.700" (17.80mm)	-	0.850" (21.60mm)	6.8W @ 75°C	3.47°C/W @ 200 LFM	14.33°C/W	Aluminum	Black Anodized
HSS-B20-061H HEATSINK TO-220 4W ALUMINUM Same Sky (Formerly CUI Devices)	1,421 In Stock	1 : $1.29000 Box	HSS	Box	Active	Board Level	TO-220	PC Pin	Rectangular, Fins	1.500" (38.10mm)	0.504" (12.80mm)	-	0.500" (12.70mm)	4.0W @ 75°C	5.01°C/W @ 200 LFM	18.63°C/W	Aluminum	Black Anodized
HSS10-B20-P40 HEAT SINK, STAMPING, TO-220, 29. Same Sky (Formerly CUI Devices)	1,451 In Stock	1 : $1.37000 Box	HSS	Box	Active	Board Level, Vertical	TO-220	Bolt On and PC Pin	Rectangular	1.180" (29.97mm)	1.000" (25.40mm)	-	0.500" (12.70mm)	4.1W @ 75°C	7.90°C/W @ 200 LFM	18.12°C/W	Aluminum Alloy	Black Anodized
HSS07-C20-P274 HEAT SINK, STAMPING, TO-220, 21. Same Sky (Formerly CUI Devices)	9,319 In Stock	1 : $2.10000 Box	HSS	Box	Active	Board Level, Vertical	TO-220	PC Pin	Rectangular	0.853" (21.66mm)	0.520" (13.21mm)	-	0.515" (13.08mm)	2.5W @ 75°C	12.60°C/W @ 200 LFM	29.57°C/W	Copper Alloy	Tin
HSS01-B20-CP HEAT SINK, STAMPING, TO-220, 49. Same Sky (Formerly CUI Devices)	514 In Stock	1 : $2.50000 Box	HSS	Box	Active	Board Level, Vertical	TO-220	Bolt On and PC Pin	Rectangular	1.941" (49.31mm)	1.900" (48.26mm)	-	0.950" (24.13mm)	9.9W @ 75°C	3.70°C/W @ 200 LFM	7.59°C/W	Aluminum Alloy	Black Anodized
HSS-B20-0635H-02 HEATSINK TO-220 2.6W ALUMINUM Same Sky (Formerly CUI Devices)	4,188 In Stock	1 : $0.80000 Bag	HSS	Bag	Active	Board Level, Vertical	TO-220	PC Pin	Rectangular, Fins	0.520" (13.20mm)	0.500" (12.70mm)	-	0.748" (19.00mm)	2.6W @ 75°C	10.49°C/W @ 200 LFM	29.09°C/W	Aluminum	Black Anodized
HSS-B20-0953H-01 HEATSINK TO-220 2.3W ALUMINUM Same Sky (Formerly CUI Devices)	2,812 In Stock	1 : $1.00000 Bag	HSS	Bag	Active	Board Level	TO-220	PC Pin	Rectangular, Fins	0.500" (12.70mm)	0.504" (12.80mm)	-	0.590" (15.00mm)	2.3W @ 75°C	11.04°C/W @ 200 LFM	33.28°C/W	Aluminum	Black Anodized
HSS-B20-061H-03 HEATSINK TO-220 2.9W ALUMINUM Same Sky (Formerly CUI Devices)	2,408 In Stock	1 : $1.00000 Bag	HSS	Bag	Active	Board Level	TO-220	PC Pin	Rectangular, Fins	0.512" (13.00mm)	0.512" (13.00mm)	-	0.748" (19.00mm)	2.9W @ 75°C	5.72°C/W @ 200 LFM	25.86°C/W	Aluminum	Black Anodized
HSS-B20-NPS-01 HEATSINK TO-220 4.2W ALUMINUM Same Sky (Formerly CUI Devices)	3,873 In Stock	1 : $1.03000 Bag	HSS	Bag	Active	Board Level	TO-220	Bolt On	Rectangular, Fins	1.180" (29.97mm)	1.000" (25.40mm)	-	0.500" (12.70mm)	4.2W @ 75°C	5.88°C/W @ 200 LFM	17.74°C/W	Aluminum	Black Anodized
HSS-B20-0508H-01R HEATSINK TO-220 4.7W ALUMINUM Same Sky (Formerly CUI Devices)	3,685 In Stock	1 : $1.03000 Bag	HSS	Bag	Active	Board Level	TO-220	Bolt On and Board Mounts	Rectangular, Fins	0.500" (12.70mm)	1.000" (25.40mm)	-	1.180" (29.97mm)	4.7W @ 75°C	5.87°C/W @ 200 LFM	15.83°C/W	Aluminum	Black Anodized
HSS-B20-NPS-02 HEATSINK TO-220 5.1W ALUMINUM Same Sky (Formerly CUI Devices)	3,626 In Stock	1 : $1.03000 Bag	HSS	Bag	Active	Board Level	TO-220	Bolt On and Board Mounts	Rectangular, Fins	0.500" (12.70mm)	1.000" (25.40mm)	-	1.180" (29.97mm)	5.1W @ 75°C	4.20°C/W @ 200 LFM	14.71°C/W	Aluminum	Black Anodized
HSS19-B20-NP HEAT SINK, STAMPING, TO-218/TO-2 Same Sky (Formerly CUI Devices)	2,146 In Stock	1 : $1.13000 Bag	HSS	Bag	Active	Top Mount	TO-218, TO-220	Bolt On	Rectangular, Fins	0.866" (22.00mm)	0.748" (19.00mm)	-	0.748" (19.00mm)	3.35W @ 75°C	8.80°C/W @ 200 LFM	22.39°C/W	Aluminum Alloy	Black Anodized
HSS20-B20-NP HEAT SINK, STAMPING, TO-218/TO-2 Same Sky (Formerly CUI Devices)	1,659 In Stock	1 : $1.13000 Bag	HSS	Bag	Active	Top Mount	TO-218, TO-220	Bolt On	Rectangular, Fins	0.866" (22.00mm)	0.748" (19.00mm)	-	0.433" (11.00mm)	2.84W @ 75°C	11.20°C/W @ 200 LFM	26.40°C/W	Aluminum Alloy	Black Anodized
HSS-B20-NP HEATSINK TO-220 4W ALUMINUM Same Sky (Formerly CUI Devices)	3,690 In Stock	1 : $1.17000 Box	HSS	Box	Active	Board Level	TO-220	-	Rectangular, Fins	1.500" (38.10mm)	0.504" (12.80mm)	-	0.500" (12.70mm)	4.0W @ 75°C	5.01°C/W @ 200 LFM	18.63°C/W	Aluminum	Black Anodized
HSS14-B20-NP HEAT SINK, STAMPING, TO-220, 19. Same Sky (Formerly CUI Devices)	4,950 In Stock	1 : $1.25000 Box	HSS	Box	Active	Board Level, Vertical	TO-220	-	Rectangular	0.980" (24.89mm)	0.750" (19.05mm)	-	0.157" (4.00mm)	3.1W @ 75°C	11.60°C/W @ 200 LFM	23.91°C/W	Aluminum Alloy	Black Anodized
HSS23-B20-NP HEAT SINK, STAMPING, TO-218/TO-2 Same Sky (Formerly CUI Devices)	2,404 In Stock	1 : $1.34000 Box	HSS	Box	Active	Top Mount	TO-218, TO-220	Bolt On	Rectangular, Fins	1.654" (42.00mm)	1.496" (38.00mm)	-	0.787" (20.00mm)	7.36W @ 75°C	5.00°C/W @ 200 LFM	10.19°C/W	Aluminum Alloy	Black Anodized
HSS09-B20-P431 HEAT SINK, STAMPING, TO-220, 29. Same Sky (Formerly CUI Devices)	2,215 In Stock	1 : $1.37000 Box	HSS	Box	Active	Board Level, Vertical	TO-220	Bolt On and PC Pin	Rectangular	1.180" (29.97mm)	1.000" (25.40mm)	-	0.500" (12.70mm)	4.0W @ 75°C	7.70°C/W @ 200 LFM	18.82°C/W	Aluminum Alloy	Black Anodized
HSS15-B20-P40 HEAT SINK, STAMPING, TO-220, 23. Same Sky (Formerly CUI Devices)	4,954 In Stock	1 : $1.55000 Box	HSS	Box	Active	Board Level, Vertical	TO-220	Bolt On and PC Pin	Rectangular	1.500" (38.10mm)	0.921" (23.40mm)	-	0.500" (12.70mm)	5.0W @ 75°C	8.50°C/W @ 200 LFM	15.16°C/W	Aluminum Alloy	Black Anodized
HSS13-B20-NP HEAT SINK, STAMPING, TO-220, 31 Same Sky (Formerly CUI Devices)	1,096 In Stock	1 : $1.75000 Box	HSS	Box	Active	Board Level, Vertical	TO-220	-	Rectangular	1.220" (31.00mm)	0.994" (25.25mm)	-	0.508" (12.90mm)	4.8W @ 75°C	7.70°C/W @ 200 LFM	15.50°C/W	Aluminum Alloy	Black Anodized
HSS02-B20-P318 HEAT SINK, STAMPING, TO-220, 23. Same Sky (Formerly CUI Devices)	1,349 In Stock	1 : $1.84000 Box	HSS	Box	Active	Board Level, Vertical	TO-220	Bolt On and PC Pin	Rectangular	1.900" (48.26mm)	0.930" (23.62mm)	-	0.950" (24.13mm)	6.9W @ 75°C	4.80°C/W @ 200 LFM	10.90°C/W	Aluminum Alloy	Black Anodized

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Heat sinks are thermal management components designed to dissipate heat from high-power electronic devices and prevent overheating. Their core function is based on the principles of conduction, and convection, transferring heat from a heat source—such as a CPU, power transistor, or BGA package—to the surrounding air or a coolant. By increasing the surface area in contact with cooling media, heat sinks help maintain safe temperature levels and protect component reliability and performance.

Most heat sinks are made of aluminum or copper, materials known for their high thermal conductivity. Aluminum heat sinks are lightweight and cost-effective, ideal for general-purpose cooling solutions, while copper heat sinks offer better conductivity for high-performance or space-constrained applications. Finned and extrusion-style heat sinks use strategically shaped surfaces to maximize exposure to air, enhancing natural or forced convection. Cross-cut designs further improve airflow and thermal dispersion. In advanced applications, heat pipes, liquid cooling, or graphite spreaders may be used to rapidly move heat away from the source. For compact or passive systems, passive heat exchangers rely entirely on natural airflow without the use of fans.

Proper thermal contact between the heat sink and device is critical—thermal interface materials (TIMs) such as thermal paste, pads, or solder are used to fill microscopic gaps and reduce thermal resistance. When selecting a heat sink, consider the thermal output of the component, available space, airflow conditions, and the thermal resistance of the system.

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