Help identifying a component in a TO92 package

Thread Starter


Joined Feb 6, 2019
Hi I have a Motorola part with some numbers on it that I cant find anywhere top to bottom it says .15- then 1020 under it then Motorola's M and 730.

Its on a small board that controls a intake heater on a Cat engine. Its feed on pin 1 with 5Vdc pin 2 will be ground through a resistor and pin 3 im guessing is some type of signal.

Thanks for any help you can offer.


Joined Jun 26, 2012
A clear photo of the part would help. Also something to identify the Cat engine (maybe we can find some repair references) would help too.


Joined Jan 27, 2019
Here are the pictures in operation it seems to be a PNP transistor, and it seems to be working now I am trying to identify the 20 pin DIP in the second photo.

It’s a CAT 3116 engine old part number 7P7730 new number 7E-9958
A clear image of the back of the PCB might help work out what that component is. The numbers aren't much help.