Learn about-




Revision 6.00 18th April. 2015


Search with


The Web This site

Identify Transistor Pin-outs

Which Pin Is Which on a BJT?

Use this chart to find which pin is the base on a bipolar transistor and at the same time get a good idea of whether the transistor is faulty or good.(Don´t test FETs in this way though - handling FET pins can destroy the transistor!).

Follow tests 1 - 3 then decide from the result which of the four arrows to follow. You may have to go through the test sequence more than once to make your diagnosis.

Identifying the pins on bipolar transistors

Home  Previous  Top of Page  Next