I'm doing some experimenting with a 2N6388 Darlington Transistor, and getting some unexpected (to me) results. It's been a while since I've played with a raw transistor, so there's a very real possibility that I'm simply mis-remembering how these things work.
According to the datasheet (last page), pin 1 is the base, 2 the collector, and 3 is the emitter.
However, when I apply 5V to pin 1 (base), 12V to pin 2 (collector), and pull down pin 3 with a 100K resistor, I read ~5V on pin 3, where I think I should see 12V.
If ignore the datasheet and treat pin 1 as the collector and pin 2 as the base, and swap the voltages accordingly, then I finally see the 12V on pin 3, and can turn it on and off by alternating pin 2 between 5V and GND.
So, is the datasheet wrong (I doubt it), or do I had a counterfeit transistor (kinda doubt that, too), or (most likely) am I making some fundamental mistake that's leading me astray?