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Device Identification Assistance
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nctnico:

--- Quote from: bob91343 on February 14, 2021, 06:26:30 pm ---Could also be an SCR.  Put it on one of those Chinese all purpose little testers.

--- End quote ---
SCRs in this package style usually have a smaller terminal from the gate. Just checked my parts bin  :P
amyk:
1970s/80s power semiconductor databooks might yield a clue... although the modern RD91 package triacs look similar.
German Ron:
OK, I've ordered a Chinese component tester.

I've also taken a larger handful out of the bag. They're all marked 6-5910, some are marked ECC343 instead of ECC074. There's no marking on the mounting flanges which would indicate they'd ever been used.

The case does not conduct to any of the pins (or at least at multimeter voltages). They conduct in both directions from 1-3, but 2 doesn't show any conductivity to 1,3 or case in either polarity.

I'm very intrigued as to who made them, there's no manufacturer's logo on any of them.

Thanks for the suggestions thus far.
German Ron:
OK, out of the 8 I took out of the bag initially, none of them actually worked.  |O

Turns out they're NPN power transistors. Both part codes look the same on the Chinese tester. Most of them appear to be dead, with various resistances as shown in nok below.

I'm still interested as to who made them etc, googling the part codes doesn't give me anything at all useful. I expect that my curiosity in this case will have to remain unsatisfied.



Gyro:
From the readings, they look like Germanium power transistors. They may all be functional - Germanium would tend to have higher leakage currents, which can easily fool simple semiconductor testers. Try putting them in the fridge and testing them cold (cold = lower leakage).
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