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.

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 doesnt 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 Series
RS Stock No. 403-162
Mfr. Part No.437856
HK$11.79
Each (In a Pack of 10)
units
- 25mm 12.5mm 25mm 12.5 x 34.5 x 25mm 11.4K/W Solder - Black - - - TO-218, TO-220, TO-247 -
RS Stock No. 774-2798
Mfr. Part No.LAM 3 K 75 05
HK$520.86
Each
units
- 75mm 30mm 30mm 75 x 30 x 30mm 1.18K/W PCB Mount - Natural - - - - -
RS Stock No. 189-8606
Mfr. Part No.SK42-150-SA
HK$185.91
Each
units
Universal Rectangular Alu 150mm 200mm 25mm 150 x 200 x 25mm 0.7K/W - - Black - - Aluminium - -
RS Stock No. 402-989
Mfr. Part No.PF527
HK$122.09
Each (In a Pack of 10)
units
- 26.9mm 40.8mm 25mm 26.9 x 40.8 x 25mm 7.4K/W Solder - Black - - - TO-3 -
RS Stock No. 234-2407
Mfr. Part No.PPC0350BP
HK$19.91
Each
units
- 35mm 16mm 27mm 35 x 16 x 27mm 9°C/W Clip - Black - - - - -
RS Stock No. 169-6927
Mfr. Part No.KL175 SW
BrandSeifert
HK$36.61
Each
units
- 40mm 27mm 12.7mm 40 x 27 x 12.7mm 14K/W PCB Surface Mount - Black - - - TO-3 -
RS Stock No. 722-6805
Mfr. Part No.SK 577/20 SA
HK$21.83
Each
units
Universal Round Alu - - 20mm 50 (Dia.) x 20mm 2.4K/W Screw 50mm Black - - - LED -
RS Stock No. 234-2277
Mfr. Part No.LS85
HK$12.09
Each
units
- 38mm 42mm 25mm 38 x 42 x 25mm 7.1°C/W Clip, Screw - Black - - - TO-220 -
RS Stock No. 169-9831
Mfr. Part No.WA400 8P
BrandSeifert
HK$16.36
Each
units
Universal Rectangular Alu 25mm 16mm 11mm 25 x 16 x 11mm 18K/W - - - - - - - -
RS Stock No. 169-9897
Mfr. Part No.WA502 8
BrandSeifert
HK$74.13
Each
units
- 37.5mm 60mm 15mm 37.5 x 60 x 15mm 6K/W - - - - - - TO-3 -
RS Stock No. 158-540
Mfr. Part No.TDEX3132/100/FMF12G
HK$503.59
Each
units
Universal Rectangular Alu 100mm 101.6mm 77mm 100 x 101.6 x 77mm 0.16K/W - - Black - - - - -
RS Stock No. 189-8959
Mfr. Part No.LAICK17X17W
HK$527.50
Each
units
Universal Square Alu with fan 43.1mm 43.1mm 20mm 43.1 x 43.1 x 20mm 1.6K/W Conductive Adhesive - Black - - - - -
RS Stock No. 221-2176
Mfr. Part No.SK76-37,5-TO220
HK$19.68
Each
units
- 37.5mm 32mm 20mm 37.5 x 32 x 20mm 8K/W Screw - Black - - - TO-220 -
RS Stock No. 189-8757
Mfr. Part No.SK01-75-SA
HK$46.68
Each
units
- 75mm 115mm 26mm 75 x 115 x 26mm 2.5K/W Screw - Black - - - - -
RS Stock No. 780-5906
Mfr. Part No.ILA-HSINK-STAR-50X20MM-RED-K
HK$121.61
Each
units
Dragon 1, Duris 1, Duris 4, Oslon 1, Oslon 4, Stanley 1, Stanley 4 - - 20mm 50 (Dia.) x 20mm - Screw 50mm Red - - - LED -
RS Stock No. 489-6142
Mfr. Part No.MBH40002-25P/2.6
BrandMalico
HK$73.22
Each
units
Clip 40mm 40mm 25mm 40 x 40 x 25mm - Clip - Black - - - - -
RS Stock No. 903-3107
Mfr. Part No.177AB2000B
HK$897.24
Each
units
Universal Rectangular Alu 200mm 300mm 83mm 200 x 300 x 83mm 0.07°C/W PCB Mount - - High Power Semiconductor Device, Optoelectronic Device Anodized Aluminium - 100
RS Stock No. 774-2802
Mfr. Part No.LAM 3 K 100 05
HK$526.93
Each
units
- 100mm 30mm 30mm 100 x 30 x 30mm 1.2K/W PCB Mount - Natural - - - - -
RS Stock No. 189-8561
Mfr. Part No.SK08-75-SA
HK$66.12
Each
units
- 75mm 88mm 35mm 75 x 88 x 35mm 1.9K/W - - Black - - - - -
RS Stock No. 271-864
Mfr. Part No.345AB1000B
HK$111.18
Each
units
Universal Rectangular Alu 100mm 120mm 37mm 100 x 120 x 37mm 1K/W - - Black - - - - -
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