I have a dilemma. In cleaning up my shop I came across a dozen TIP626 transistors in T0-92 packages. Research shows this type transistor to actually be in a T0-3 case and run 80 volts at 5 amps. It's described as a Darlington power transistor. Obviously my little ones are nowhere close to those values. Any clue as to what I actually have? A true enigma. I've attached a high resolution photo for review.

 

Hello,

The part is most likely a BF247 N-channel junction fet.
I have attached a datasheet for you.

Bertus

 

Because the size limited the heat spead out, so you better treat it like as a bjt for a TO-92 packages has Imax rated=150mA and using it under 1/3 of Imax then it will be about 50mA, but you still need to measure the temperature of bjt when it working up to 50mA, the temperature should be just feel a little warm not feel hot, the temperature could be around or less than 104 ℉.

 

According to my reference book;
TIP626 Si PNP Darlington, 80v 5A 65W B>1000, package TO-3
so they are not TIP626!

Most likely they are B?247 like Bertus said.

 

The T looks suspiciously like the T symbol for Teccor (now LittleFuse).
It was most likely one of their different numbering schemes IP626?
Max.

 

What I found so far, via testing, is that this is a PNP Silicone with a hFE of 42. One of them fell way out of the average with a hFE of 74 (or maybe the others are out of range). When I get the ambition I'll do a destructo test and find max E&I on one of them.