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 Priced to Clear
RS Stock No. 402-995
Mfr. Part No.1.25GY-50
£1.339
Each (In a Pack of 10)
Units
- 32mm 32mm 16mm 60 x 32 x 16mm 6.8°C/W Screw - Black - - - TO-220 -
RS Stock No. 712-4320
Mfr. Part No.575200B00000G
£0.548
Each (In a Pack of 5)
Units
- 15.2mm 3.1mm 12.7mm - 60°C/W Plug-On Collar - Black - Black Anodized - TO-92 -
RS Stock No. 268-105
Mfr. Part No.400020
£0.87
Each (In a Pack of 5)
Units
- 19mm 22mm 19mm 11 x 22 x 19mm 23°C/W PCB Through Hole - - - - - TO-220 -
RS Stock No. 403-184
Mfr. Part No.437874
£0.751
Each (In a Pack of 10)
Units
- 50mm 34.5mm 50mm 12.5 x 34.5 x 50mm 8.8K/W Solder - Black - - - TO-218, TO-220, TO-247 -
RS Stock No. 712-4273
Mfr. Part No.BW50-2G
£0.812
Each (In a Pack of 5)
Units
- 25.4mm 34.9mm 50mm 25.4 x 34.9 x 50mm 5.8K/W PCB Through Hole - Black - - - TO-218, TO-220, TO-247 -
RS Stock No. 401-964
Mfr. Part No.TV40G
£1.908
Each (In a Pack of 20)
Units
- 38mm 28mm 22mm 38 x 28 x 22mm 9.9°C/W Screw - Black - - - TO-220 -
RS Stock No. 821-813
Mfr. Part No.2333B
£6.30
Each
Units
Universal Square Alu 45.72mm 44.58mm 16.51mm 45.72 x 44.58 x 16.51mm 7.2K/W Clip - Black - - - BGA -
RS Stock No. 403-162
Mfr. Part No.437856
£0.942
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. 712-4279
Mfr. Part No.6396BG
£1.68
Each (In a Pack of 5)
Units
- 25.4mm 41.91mm 25.4mm 25.4 x 41.91 x 25.4mm 5.6°C/W - - Black - - - TO-218, TO-220, TO-247 -
RS Stock No. 401-548
Mfr. Part No.5FG
£0.506
Each (In a Pack of 50)
Units
- 16mm 16mm 12.7mm 16 x 16 x 12.7mm 45.2K/W PCB Through Hole - Black - - - TO-220 -
RS Stock No. 507-4955
Mfr. Part No.EW/B/75
£8.86
Each
Units
Universal Rectangular Alu 75mm 150mm 25mm 75 x 150 x 25mm 1.4K/W - - Black - - - - -
RS Stock No. 821-807
Mfr. Part No.2321B
£1.39
Each
Units
Universal Square Alu 43.18mm 41.28mm 8.89mm 43.18 x 41.28 x 8.89mm 10°C/W Clip - Black - - - PGA -
RS Stock No. 712-4295
Mfr. Part No.TV5G
£0.90
Each (In a Pack of 5)
Units
- 19mm 22mm 19mm 19 x 22 x 19mm 21°C/W Screw - Black - - - TO-220 -
RS Stock No. 712-4437
Mfr. Part No.0S506/150/B
£5.50
Each
Units
- 150mm 27mm 50mm 150 x 27 x 50mm 2.46K/W Clip - Black - - - - -
RS Stock No. 712-4409
Mfr. Part No.0S565/150/B
£3.67
Each
Units
- 150mm 15mm 54mm 150 x 15 x 54mm 3.43K/W Clip - Black - - - - -
RS Stock No. 507-5194
Mfr. Part No.S561/B/100
£7.79
Each
Units
Universal Rectangular Alu 100mm 120mm 37mm 100 x 120 x 37mm 1.1K/W - - Black - - - - -
RS Stock No. 507-4753
Mfr. Part No.577102B00000G
£0.242
Each (In a Pack of 5)
Units
- 13.21mm 19.05mm 9.52mm 13.21 x 19.05 x 9.52mm 25.9°C/W - - Black - Black Anodized - TO-220 -
RS Stock No. 712-4415
Mfr. Part No.0S508/150/B
£9.33
Each
Units
- 150mm 39mm 31.5mm 150 x 39 x 31.5mm - - - - - - - - -
RS Stock No. 712-4260
Mfr. Part No.ML26AAG
£0.516
Each (In a Pack of 5)
Units
- 25mm 15mm 20mm 25 x 15 x 20mm 17.9°C/W PCB Through Hole - Black - - - TO-220 -
RS Stock No. 268-098
Mfr. Part No.PF750G
£0.83
Each (In a Pack of 5)
Units
- 11mm 22mm 19mm 11 x 22 x 19mm 20.3K/W PCB Through Hole - - - - - TO-220 -