transistor and collector question

A 2N3705 transistor has a value of hFE of 116.4. When the current through the collector is measured as 50mA, what would be the value of IB in μA?

by gufinesburg
May 02, 2018

This is an unreal question. First the value of hFE varies with voltage, current and temperature. It is meaningless to describe it to such accuracy. Secondly you always design so that hFE does not matter, for example by applying feedback, in which case you only need it guaranteed to be more than a certain figure. Tell your teacher to get out in the real world occasionally. And if you can't figure out the answer to this trivial question, should you be on this course at all?

by mikerogerswsm
May 02, 2018

1 Answer

Answer by lukeluck

about 400uA but it really depends


IC=hFE*IB the formula works when the transistor is during Zoom out zone...

+1 vote
by lukeluck
May 03, 2018

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