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Hybrid parameter (or H-parameter) is one of a set of four transistor equivalent-circuit parameters that conveniently specify transistor performance for small voltages and currents in a particular circuit.
The expression hfe, known as a hybrid parameter, is the common-emitter DC forward-current gain. It is equal to the collector current divided by the base current (hfe = Ic/Ib).
While I confirm the above comments, still in actuality there are two very similar parameters; namely, HFE and hfe, the former being the large signal gain and the latter being the small signal gain. Althogh very close for most transistors, their definitions differ in the prementioned way.
Hi ..
This may help u...
Static forward current transfer ratio Symbol,
hfe. An expression of gain in a bipolar transistor.
It can range from a factor of just a few times up to
hundreds of times. Mathematically,
hfe= IC/IB
where IC is the collector current and IB is the base
current. The 'hfe' rating is important because it
gives engineers an indication of the greatest current
amplification that can be obtained with a
particular transistor.
Regards..
In terms of h parameters hfe is the small signal current gain with output port shorted. HFE is the same thing in dc conditions i.e. the collector (in case of transistor) being shorted to grounded. For hfe the ac equivalent circuit has to be drawn assuming all dc voltage sources (biases) grounded.
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