Does anyone know what transistor (or transistors) is this ?

Thread Starter

tete0010

Joined Aug 3, 2019
13
I only read that it's a Motorola and 381, but I can't find anything that's full equivalent. Any ideas?
Thank you in advance

20190827_182105.jpg
 

Thread Starter

tete0010

Joined Aug 3, 2019
13
OK. That pair is working in a 0-30v 4/5A regulated power supply. I forgot to post it, sorry.
I searched and 2SD381 datasheet and I find two options, the first is a Silicon NPN Power Transistors TO-220C package, and the second, a Audio Frequency Power Amplifier, Low Speed Switching.
These pair of transistors work in addition to a LM723CH
 

AnalogKid

Joined Aug 1, 2013
8,102
These pair of transistors work in addition to a LM723CH
That helps, some. Unfortunately, the 723 can be used with either NPN or PNP external pass transistors. Schematic? Photo of both sides of the circuit board?

ak
 
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