Electronic – help identify the part number from the marking of SOT-23 components

analogcomponent-selectioncomponentssurface-mounttransistors

I want to figure out the part number of the following components all (SOT-23) from a 20 year old PCB i am trying to fix , it is coated with conformal coating , but i scratched the top of these components :

The strange is the vertical letter along with the horizontal marking . this is how i Read them :

1. U1 K

U1 K ?

2. Z1 C

Z1 C ?

3. O2p 45

OPS

4. JSs 42

jsc

5. Sts 3N

sts

Best Answer

You could desolder each, one-by-one, and run them through a good tester to uncover what type of device they are and their pinouts. Some testers even report beta, handle mosfets, etc. Even with this knowledge you'll still have to reverse the circuitry to find modern devices which suit it.

To get the conformal coating off, Pace has a helpful video.

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