factors related to thermal stability of transistor

That's an extensive subject for a newsgroup post. Were you thinking of bipolar junction transistors? Perhaps you should be more specific.

That sure is a vague way to state a homework question ;-)

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

I read in sci.electronics.design that snipped-for-privacy@hotmail.com wrote (in ) about 'factors related to thermal stability of transistor', on Fri, 7 Jan

You should have asked on sci.electroncis.basics. Here you may get answers that are so exhaustive that you will be exhausted.

Factors:

Material (germanium, silicon, gallium arsenide...);

Leakage current (collector current with base and emitter short- circuited);

DC resistance in the base circuit;

Ambient temperature;

Collector power dissipation under operating conditions;

Maximum instantaneous collector to emitter voltage;

Some other factors that usually have only a small effect.