"Tiny Cooling Fan" power devices using the radiator is to control the temperature of the power devices, especially the junction temperature Tj, it is lower than the power device work properly secure the junction temperature, thereby improving the reliability of power devices. Conventional "Tiny Cooling Fan" radiator tend standardization, serialization, universal, and the new product is to the low thermal resistance, multi-functional, small size, light weight, suitable for automation, production and installation direction. Reasonable selection, design radiator, can effectively reduce the power of the device junction temperature and improve the "Tiny Cooling Fan" power device reliability.