YT Thermal Heat Sink Design

Heat sink design with YT Thermal, we engineers for professional thermal analysis software, for customers to budget the best size of the radiator and the best radiator process, shorten the product development cycle.


A Heat Sink Size Calculator

Usually, the electronic engineer will give the structural engineer, to be precise, the thermal engineer a chip power, and then let the thermal engineer calculate an approximate heat sink space, of course, with reference to the fan's air volume, ambient temperature and other factors, this time, We can use the formula to roughly calculate a preliminary heat sink size, and then give the Mechanical Design Engineer to design a chassis or define an outer box size.

Generally speaking, the difference of this kind of estimation is about 10-15%. Compared with the data in the actual test, this value is very high and close to the actual data. After all, this is the theoretical data, and then the thermal engineer calculates it through the Ansys or Icepak /Flothermal software.

The analysis accurately knows the size of the heat sink and the area of the fin, and then optimizes a suitable heat sink. The data at this time is basically about 3-5% different from the actual one. Then, we can start to do sample testing,to optimizing the final result, such as adjusting the size of the heat sink, adjusting the size of the fan and other parameters.

Estimate the overall volume of the heat sink required to cool a heat source by using the following equation

V= (Q*Rv)/Delta T

Heat sink volume in cm3 = (heat source power in watts x volumetric thermal resistance) / (Tjunction – maximum ambient temperature)


Heat Source Power (Q)=4W;

Tcase Max (manuf supplied)=75 Deg. C 

Max Ambient Temperature=45 Deg. C

So the Delta – T (Thermal Budget)=75-45=30Deg. C

Volumetric Thermal Resistance (Rv)

If we choose Rv=500,

So the Estimated Heat Sink Volume =4×500/30=66.7cm3

and you can Desire Heat Sink Volume:WxLxH =4x4x4.16cm=66.7cm3