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Maximum dissipation for mosfet with heatsink but no fan.

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grizedale

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Hello,

I beg to know what is the maximum dissipation (Watts) of a TO220 or TO247 Mosfet attached to a heatsink of any size , where a fan is NOT needed?

In other words, what is the dissipation level in a mosfet, where any size increase of heatsink provides no further cooling improvement , and a fan becomes necessary?

I am speaking of a mosfet in a well ventilated enclosure with 30 degrees C ambient.
 

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