Page 138 - Testing Electronic Components

Testing Darlington transistor with built in Diode

Again we have to depend on semiconductor data book to help us to locate
if the particular transistor that you want to test is belong to Darlington
transistor with or without built in diode.

Because of the built in diode, the result that you get is completely
different from testing the Darlington transistor that have no diode built
into it. It is difficult to find the Base, Collector and the Emitter pins due
to the built in diode. I guess you have to refer to semiconductor data
books or even the internet to look for its pin outs.

Testing this type of transistor is easy-please refers to the photos below:

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