Electronic – Small SOT-23 transistor markings


I've got a SOT-23 transistor (I think, but it could also be an IC) marked with 1E. Another one is marked with A7W. Then I can also see WR5. How are you supposed to decode these?

Best Answer

You could try the "SMD code book" or get the actual schematic or package for the device, but there may not really be a clear way to identify many SMD parts from the surface.

1E for example might be a plain BC847A according to the list.