How to identify the emitter, base and collector of BC 337 and BC 327

 

you download and read datahseet

 

 

Careful to check the datasheet for your supplier.
There are many variations in the pinouts of these transistors.

If you have a multimeter you can identify NPN and PNP and the ebc terminals by identifying the diodes.

 

please advice how to do that

 

please advice how to do that

Check this

 

you download and read datahseet

+1
Data sheets are king! If you don't use/read 'em - you lose. If you don't know how to read 'em - learn how.

 

You can find which one is which following this guide:

http://www.talkingelectronics.com/projects/200TrCcts/200TrCcts.html#AAA

 

A transistor can be considered as two back to back diodes for test purposes as in the top of the rather haasty sketch.

So if you set a multimeter on the ohmsx100 range and watch the meter (either digital or analog, but analog is best) and apply the leads to the collector base diode one way and then reverse the leads you will get readings as shown.
Note I have shown an NPN transistor, a PNP one will work the same with the red and black reversed.

Then you can do the same with the base emitter diode and finally with the collector emitter pair.



You should check a known good transistor first to see what happens.