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 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 Series
RS Stock No. 180-5418
Mfr. Part No.KK 633
BrandSeifert
£0.50
Each
Units
TO-220 20.3mm 6.8mm 25.4mm 20.3 x 6.8 x 25.4mm 21K/W Clip - Black - - - - -
RS Stock No. 168-6289
Mfr. Part No.WA 470
BrandSeifert
£37.66
Each
Units
- - - - - - - - Black - - - - -
RS Stock No. 169-9831
Mfr. Part No.WA400 8P
BrandSeifert
£1.43
Each
Units
- 25mm 16mm 11mm 25 x 16 x 11mm 18K/W - - - - - - - -
RS Stock No. 168-6352
Mfr. Part No.WA 202
BrandSeifert
£66.64
Each
Units
TO-3, TO-66 1m 120mm 37mm - - - - Black - - - - -
RS Stock No. 299-3336
Mfr. Part No.KL 195/63.5/SW
BrandSeifert
£3.88
Each
Units
T-66 42mm 25.4mm 63.5mm 42 x 25.4 x 63.5mm 3.6K/W Solder - Black - - - - -
RS Stock No. 169-6999
Mfr. Part No.KL157 KOMBI SW
BrandSeifert
£1.26
Each
Units
TO-3, TO-32, TO-66, TO-9 41.3mm 33mm 25.4mm 41.3 x 33 x 25.4mm 25.4K/W Clip - - - - - - -
RS Stock No. 168-6217
Mfr. Part No.KL105.29SW
BrandSeifert
£1.04
Each
Units
TO-220 27mm 16mm 33mm 27 x 16 x 33mm 19K/W Solder - Black - - - - -
RS Stock No. 169-9847
Mfr. Part No.WA243 1
BrandSeifert
£64.13
Each
Units
- 150mm - - - 0.3K/W - - - - - - - -
RS Stock No. 169-9803
Mfr. Part No.WA201 5
BrandSeifert
£11.56
Each
Units
TO-3, TO-66 75mm 100mm 28mm 75 x 100 x 28mm 2.5K/W - - Black - - - - -
RS Stock No. 195-1634
Mfr. Part No.WA 210
BrandSeifert
£193.73
Each
Units
- 200mm - 40mm - - - - Black - - - - -
RS Stock No. 300-2885
Mfr. Part No.KL 195/38.1/SWI
BrandSeifert
£3.17
Each
Units
T-66 42mm 25.4mm 38.1mm 42 x 25.4 x 38.1mm 5K/W Solder - Black - - - - -
RS Stock No. 168-6245
Mfr. Part No.KL167SW
BrandSeifert
£1.54
Each
Units
TO-220 30mm 25.4mm 12.7mm 30 x 25.4 x 12.7mm 15K/W Solder - Black - - - - -
RS Stock No. 169-9780
Mfr. Part No.WA208 14
BrandSeifert
£8.41
Each
Units
TO-3 75mm 54mm 31.6mm 75 x 54 x 31.6mm 2.2K/W - - Black - - - - -
RS Stock No. 168-8061
Mfr. Part No.WA204B
BrandSeifert
£36.12
Each
Units
- - 79mm 15mm - - - - - - - - - -
RS Stock No. 169-9897
Mfr. Part No.WA502 8
BrandSeifert
£6.48
Each
Units
TO-3 37.5mm 60mm 15mm 37.5 x 60 x 15mm 6K/W - - - - - - - -
RS Stock No. 169-6927
Mfr. Part No.KL175 SW
BrandSeifert
£3.20
Each
Units
TO-3 40mm 27mm 12.7mm 40 x 27 x 12.7mm 14K/W PCB Surface Mount - Black - - - - -
RS Stock No. 300-2891
Mfr. Part No.KL 195/50.8/SWI
BrandSeifert
£3.90
Each
Units
T-66 42mm 25.4mm 50.8mm 42 x 25.4 x 50.8mm 4.2K/W Solder - Black - - - - -
RS Stock No. 168-6302
Mfr. Part No.WA 507
BrandSeifert
£23.30
Each
Units
- 1m - 280mm - - - - Black - - - - -
RS Stock No. 299-3320
Mfr. Part No.KL 151-3
BrandSeifert
£2.60
Each
Units
TO-3 64mm 64mm 25.4mm 46 x 46 x 25mm 6K/W - - Black - - - - -
RS Stock No. 168-6346
Mfr. Part No.WA 203
BrandSeifert
£28.43
Each
Units
- 1m 32mm 20mm - - - - Black - - - - -