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. 225-846
Mfr. Part No.PR1646-30-PB-SN
MYR11.35
Each
units
DIP 46.2mm 16mm 30mm 46.2 x 16 x 30mm 9.1K/W PCB Through Hole - Black - - - - -
RS Stock No. 225-880
Mfr. Part No.PR2056-30-PB-SN
MYR10.51
Each
units
DIP 56.2mm 20mm 30mm 56.2 x 20 x 30mm 6.4K/W Screw - Black - - - - -
RS Stock No. 225-919
Mfr. Part No.PC1616B-25-PB-SN
MYR7.21
Each
units
DIP 16mm 16mm 25mm 16 x 16 x 25mm 20K/W Screw - Black - - - - -
RS Stock No. 225-903
Mfr. Part No.PC1616A-25-PB-SN
MYR5.30
Each
units
DIP 16mm 16mm 25mm 16 x 16 x 25mm 19.7K/W Screw - Black - - - - -
RS Stock No. 225-896
Mfr. Part No.PR3030-30-PB-SN
MYR10.41
Each
units
DIP 30mm 30mm 30mm 30 x 30 x 30mm 15K/W Screw - Black - - - - -
RS Stock No. 225-852
Mfr. Part No.PR1724-25-PB-SN
MYR5.36
Each
units
DIP 24mm 17mm 25mm 24 x 17 x 25mm 19K/W Screw - Black - - - - -
RS Stock No. 225-874
Mfr. Part No.PR2046-30-PB-SN
MYR13.88
Each
units
DIP 46.2mm 20mm 30mm 46.2 x 20 x 30mm 7.5K/W Screw - Black - - - - -
RS Stock No. 225-925
Mfr. Part No.PC1820-25-PB-SN
MYR5.09
Each
units
DIP 20.5mm 18.5mm 25mm 20.5 x 18.5 x 25mm 18.5K/W Screw - Black - - - - -
RS Stock No. 225-802
Mfr. Part No.MS-220B-4.7M
MYR4.68
Each
units
TO-220 13.5mm 7mm 25mm 13.5 x 7 x 25mm - - - Black - - - - -
RS Stock No. 225-824
Mfr. Part No.PR1115-25-PB-SN
MYR3.77
Each
units
DIP 15mm 11mm 25mm 15 x 11 x 25mm 26K/W Screw - Black - - - - -
RS Stock No. 225-830
Mfr. Part No.PR1616-25-PB-SN
MYR6.20
Each
units
DIP 16mm 16mm 25mm 16 x 16 x 25mm 20K/W Screw - Black - - - - -