I have seen these on EBAY.
Not the usual ON Semi fakes or Motorola.
Anyone have any idea if they are genuine?
FAKES
See later post
Not the usual ON Semi fakes or Motorola.
Anyone have any idea if they are genuine?
FAKES
See later post
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I'm in severe doubt that any semiconductor manufacturer still produces this venerable and outdated device. So it most probably is a fake.
Best regards!
Best regards!
I’d be more comfortable if it were marked with a 1970’s date code. That package looks like it’s been around since then, but marked 96. A device made in 96 should be cleaner. When looking for old hometaxial 3773’s I look for devices which look like this. Preferably with residual heat sink grease on them, and solder on the pins - which means whatever they were taken out of was *working*.
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Not necessarily so with your last remark. It could also mean that someone has soldered out defective parts and kept them for whatever reason.
Best regards!
Best regards!
No need to go *that* far back. 🙂
In the 90´s I regularly bought MOSPEC made ones, they were the real thing, these *might* be too, just buy 1 or 2 and split them open.
A large die over a copper heat spreader "coin" over a regular thickness steel TO3 base is fine, a 2N3055 or smaller die soldered straight to steel base is fake, often covered in some white epoxy, and even worse, double thickness (think 2mm or more) steel base in which case do not even bother to open them.
In the 90´s I regularly bought MOSPEC made ones, they were the real thing, these *might* be too, just buy 1 or 2 and split them open.
A large die over a copper heat spreader "coin" over a regular thickness steel TO3 base is fine, a 2N3055 or smaller die soldered straight to steel base is fake, often covered in some white epoxy, and even worse, double thickness (think 2mm or more) steel base in which case do not even bother to open them.
You very much need to go that far back if you’re looking for hometaxial types (nobody was making them in 96). If you’re not, then just get new On Semi. No need to go to second sources or take chances on E-bay. Nothing wrong with Mospec per se, but you *can* get the originals from On. If you’re looking for 2N6609, you’re pretty much stuck with Mospec.
If you are really dead set on getting a “deal” at less price than Mouser or the like, always buy a test case or two and crack them open, do a load test, or both - before buying any quantity. Unless they really are old enough to predate all the fakery (96 is not). And then it would still be good to do a quick DMM test to make sure you’re not buying a dead bug. I tested those RCAs when I found them at Skycraft. As i did the slightly newer 2N6259’s.
I don’t think anybody knows. You would handle it the same way as you would any other non-On-Semiconductor 2N3773s that you might find at attractive prices. Treat as suspect, and TEST - or avoid entirely. The only problem is that E-bay sellers have been known to bait and switch. Or just post a “representative” photo - which may not be the exact one. You may not even get the same thing twice. Photo may say “TSL” because it’s what he had last time, but now the stock is fake ON - seller might not even know the difference. Your chances are just way better when you can put your hands on it (and a meter to it) before purchase.
Search for "tsl power transistor" on Google and you get a variety of popular TO3 devices, mostly on ebay
They also appear as TSL-RFT and more recently RFT-TSL
No sign of the manufacturer though
They also appear as TSL-RFT and more recently RFT-TSL
No sign of the manufacturer though
