Heatsinks

Heat sinks are a type of thermal conductor (or heat exchanger) that absorb and dissipate the heat created by electronic and mechanical devices. Heat sinks use convection, conduction or radiation to disperse heat. Discover more in our comprehensive heatsinks guide.


What are heat sinks made of?


Heat sinks are made from metal and typically constructed from copper or aluminium. Copper is an excellent thermal conductor, helping to draw heat away from the device that you are trying to cool. Although aluminium doesn’t conduct heat as well as copper, it is less expensive and lighter than copper. The heat will normally rise through a number of metal fins. Fin designs are used as they provide a greater surface area for the heat to spread across and dissipate.


What would you use a heat sink for?


Heat sinks prevent devices from overheating and are particularly important in protecting electronics such as CPUs. Components subject to too much heat can become irreparably damaged. In the most severe cases overheating components can result in fires, explosions and injury.


What devices can you use heat sinks for?


Heat sinks can be used to cool a large number of devices. For example, CPUs, LEDs, ICs and modules.


What is the difference between a heat sink and cooling fan?


Heat sinks are a piece of metal that conducts heat away from components. Fans forcibly move warm air away from components.


Terminology


A wide variety of heat sinks are available. Passive heat sinks refer to those without a fan, while the term ’active heat sinks’ refer to those with an integrated fan. You may also come across the term HSF which means a heat sink with a fan. Some heat sinks can also be combined with a liquid cooling solution to move heat away from devices. Heat sinks are also frequently spelt as ’heatsinks’.


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Description Price For Use With Length Width Height Dimensions Thermal Resistance Mounting Diameter Colour Application Finish Material Package Type Priced to Clear
RS Stock No. 263-251
BrandRS PRO
£0.939
Each (In a Pack of 10)
Units
- 20mm 35mm 20mm 20 x 35 x 20mm 17.9°C/W - - - - - Aluminium TO-220 -
RS Stock No. 176-3945
BrandRS PRO
£583.28
1 Box of 1000
Box(es)
- 25.4mm 41.9mm 38.1mm 25.4 x 41.9 x 38.1mm 3.3 (Forced) °C/W, 6.3 (Natural) °C/W Vertical - Black - Black Anodized Aluminium TO-218, TO-220, TO-247 -
RS Stock No. 176-4165
BrandRS PRO
£0.249
Each (In a Pack of 10)
Units
- 15.2mm 13.6mm 12.7mm 15.2 x 13.6 x 12.7mm 11 (Forced) °C/W, 29 (Natural) °C/W Bolt On, Horizontal, Vertical - Black - Black Anodized Aluminium TO-220 -
RS Stock No. 176-4179
BrandRS PRO
£3.84
Each
Units
1/4 Brick DC/DC Converter 57.9mm 36.8mm 11.5mm 57.9 x 36.8 x 11.5mm 2.3 (Forced)°C/W Horizontal, Screw, Vertical - Black - Black Anodized Aluminium - -
RS Stock No. 176-4185
BrandRS PRO
£0.452
Each (In a Pack of 10)
Units
- 38.1mm 34.9mm 12.7mm 38.1 x 34.9 x 12.7mm 5.5 (Forced)°C/W Vertical - Black - Black Anodized Aluminium TO-220 -
RS Stock No. 176-3950
BrandRS PRO
£821.76
1 Box of 2000
Box(es)
- 38.1mm 34.9mm 12.7mm 38.1 x 34.9 x 12.7mm 5.5 (Forced)°C/W Vertical - Black - Black Anodized Aluminium TO-220 -
RS Stock No. 176-4172
BrandRS PRO
£0.642
Each (In a Pack of 5)
Units
- 25.4mm 41.9mm 38.1mm 25.4 x 41.9 x 38.1mm 3.3 (Forced) °C/W, 6.3 (Natural) °C/W Vertical - Black - Black Anodized Aluminium TO-218, TO-220, TO-247 -
RS Stock No. 176-3939
BrandRS PRO
£90.87
1 Box of 1000
Box(es)
- 19.1mm 13.2mm 12.7mm 19.1 x 13.2 x 12.7mm 25 (Natural) °C/W, 7 (Forced) °C/W Horizontal, Mounting Hole, Vertical - Black - Black Anodized Aluminium TO-220 -
RS Stock No. 176-4151
BrandRS PRO
£2.88
Each
Units
Universal Square Alu 43.2mm 44.5mm 16.5mm 43.2 x 44.5 x 16.5mm 2 (Forced)°C/W Horizontal, Top Mount, Vertical - Black - Black Anodized Aluminium ASIC, BGA, CPU, LGA -
RS Stock No. 176-4162
BrandRS PRO
£1.252
Each (In a Pack of 5)
Units
- 46.4mm 46.4mm 33.3mm 46.4 x 46.4 x 33.3mm 2 (Forced) °C/W, 2 (Natural) °C/W Bolt On, Horizontal, Vertical - Black - Black Anodized Aluminium TO-3 -
RS Stock No. 176-3943
BrandRS PRO
£675.68
1 Box of 3000
Box(es)
- 15.2mm 13.6mm 12.7mm 15.2 x 13.6 x 12.7mm 11 (Forced) °C/W, 29 (Natural) °C/W Bolt On, Horizontal, Vertical - Black - Black Anodized Aluminium TO-220 -
RS Stock No. 176-3936
BrandRS PRO
£1,166.12
1 Box of 4000
Box(es)
- 30mm 25.4mm 12.7mm 30 x 25.4 x 12.7mm 14 (Natural) °C/W, 7.3 (Forced) °C/W Vertical - Black - Black Anodized Aluminium TO-220 -
RS Stock No. 176-4150
BrandRS PRO
£0.321
Each (In a Pack of 10)
Units
- 30mm 25.4mm 12.7mm 30 x 25.4 x 12.7mm 14 (Natural) °C/W, 7.3 (Forced) °C/W Vertical - Black - Black Anodized Aluminium TO-220 -
RS Stock No. 176-3942
BrandRS PRO
£1.139
Each (In a Box of 500)
Units
- 46.4mm 46.4mm 33.3mm 46.4 x 46.4 x 33.3mm 2 (Forced) °C/W, 2 (Natural) °C/W Bolt On, Horizontal, Vertical - Black - Black Anodized Aluminium TO-3 -
RS Stock No. 176-4176
BrandRS PRO
£0.364
Each (In a Pack of 10)
Units
- 25.4mm 34.9mm 12.7mm 25.4 x 34.9 x 12.7mm 5.8 (Forced)°C/W Vertical - Black - Black Anodized Aluminium TO-220 -
RS Stock No. 176-4153
BrandRS PRO
£0.104
Each (In a Pack of 100)
Units
- 19.1mm 13.2mm 12.7mm 19.1 x 13.2 x 12.7mm 25 (Natural) °C/W, 7 (Forced) °C/W Horizontal, Mounting Hole, Vertical - Black - Black Anodized Aluminium TO-220 -
RS Stock No. 169-4252
Mfr. Part No.SK92 150SA
£16.55
Each
Units
Universal Rectangular Alu 150mm 100mm 40mm 150 x 100 x 40mm 1K/W - - Black - - Aluminium - -
RS Stock No. 674-4756
Mfr. Part No.ICK BGA 14x14x10
£1.23
Each
Units
Universal Square Alu 14mm 14mm 10mm 14 x 14 x 10mm 27.4K/W Adhesive Foil, Conductive Foil - Black - - Aluminium BGA -
RS Stock No. 774-2782
Mfr. Part No.LAM 3 K 50 12
£42.12
Each
Units
- 50mm 30mm 30mm 50 x 30 x 30mm 1.3K/W PCB Mount - Natural - - - - -
RS Stock No. 722-6915
Mfr. Part No.SK 487/37,5 SA
£3.30
Each
Units
- 37.5mm 52.3mm 28mm 37.5 x 52.3 x 28mm 5K/W Clip - Black - - - - -