I have a motor speed control with the following transistors. I am having a heck of a time identifying them. I've had no luck finding a spec sheet on the web. Any help you may offer would be appreciated.
I don't have definitive answer, but I'll show my working up to this part so others may also use this approach to find these answers in the future.
Searching for the company logo I see this:
Which is possibly the right hand logo with the embossing obscuring it.
I got this logo picture from here.
If this is true, then this is not a transistor but either a Sensitive Triac or a SCR under that companies nomenclature.
However, I note that this is not a part number for Teccor. However, on a TO-220 package it is hard to put a whole part number. So this may be short hand version.
Searching on the data-sheets I cannot find the package labelling codes.
This company is now owned by littlefuse,so part labelling guidelines may have changed.
This should give you enough to test the part for characteristic behaviour. i.e. if you put this in a transistor tester and I am right, then it will fail.
Most of the time we are spending valuable resources to fix a faulty circuits. Finding and replacing defected components is the core of the process. Since the goal is always to get the circuit working, the chronicle of the old and bad components is not necessarily important.
What you should do is a through analysis on the circuit from which you pulled off the alien. The network of links around it will always give you good approximation about the type and specification of the device, even if the to220 lost its face..!!
As the other answer suggested, it could be a triac/scr. Its voltage rating should be at least 150% of supply voltage (RMS) and its current rating can easily determined by looking the final load.
The only remaining pieces of the puzzle is specification of the triggering current. Gate drive design of the circuit will give you ample ball park of this factor. Do research how the gate drive is designed for sensitive thrystor and compared it to the non sensitive thrystor.
While doing all these analysis you will actually gain lot and lots of knowledge which you may not get at all if you simply plug and play the defective component.