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Old 16th Apr 2019, 3:24 am   #6
Radio Wrangler
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Join Date: Mar 2012
Location: Fife, Scotland, UK.
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Default Re: Replacement power transistors hfe.

The answer is that it depends on how the supply was designed.

A lower Hfe device will demand more base current from the device driving it. This device may overheat and fail as a result or it may be fine.

Post the circuit and we can calculate the effects. Also, a cheaper Si part may be a possibility.

David
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