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
V7236B1 HEATSINK TO-220 19.05X13.21MM Assmann WSW Components	42,714 In Stock	1 : $0.54000 Bulk	-	Bulk	Active	Board Level	TO-220	Bolt On	Rectangular, Fins	0.750" (19.05mm)	0.520" (13.21mm)	-	0.500" (12.70mm)	-	-	24.00°C/W	Aluminum	Black Anodized
507302B00000G HEATSINK TO-220 2.5W LOW PROFILE Boyd Laconia, LLC	34,431 In Stock	1 : $0.54000 Bulk	-	Bulk	Active	Board Level	TO-220	Bolt On	Square, Fins	0.750" (19.05mm)	0.750" (19.05mm)	-	0.380" (9.65mm)	2.5W @ 60°C	10.00°C/W @ 200 LFM	24.00°C/W	Aluminum	Black Anodized
274-1AB HEATSINK TO-220 LOW HEIGHT BLK Wakefield Thermal Solutions	22,740 In Stock	1 : $0.52000 Bulk	274	Bulk	Active	Board Level	TO-220	Bolt On	Rectangular, Fins	0.750" (19.05mm)	0.520" (13.21mm)	-	0.375" (9.52mm)	2.0W @ 56°C	8.00°C/W @ 400 LFM	28.00°C/W	Aluminum	Black Anodized
HSS-B20-NP-06 HEATSINK TO-220 2.9W ALUMINUM Same Sky (Formerly CUI Devices)	1,793 In Stock	1 : $0.62000 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-NP-10 HEATSINK TO-220 2.9W ALUMINUM Same Sky (Formerly CUI Devices)	589 In Stock	1 : $0.95000 Bag	HSS	Bag	Active	Board Level	TO-220	-	Rectangular, Fins	0.748" (19.00mm)	0.504" (12.80mm)	-	0.500" (12.70mm)	2.9W @ 75°C	7.24°C/W @ 200 LFM	25.92°C/W	Aluminum	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.