Austin, TX
"where" did you get the new transistor?
Remarked parts are a real problem these days... unless you know it's a good supplier; I'd be suspect of it.
(Topic ID: 73117)
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Looks like an aliexpress or ebay purchase. They didn't even bother to put the transistors in an ESD bag.
Seems like they work in some cases; but, not all.
I think the problem is MPSA42 have been near EOL (end of life) for years.
https://www.digikey.com/en/products/detail/onsemi/MPSA42/32397
seems to be the only supplier which still has stock. It's unclear how long these will remain available.
An EOL notice was issued in 2007; but it appears it was on the old leaded part... unclear how long the new part will remain available.
Quoted from G-P-E:I bought a bunch of ON-Semi parts when they went Last Time Buy a few years ago and have been re-stocking using Fairchild parts. I have thousands of MPSA42s and KSP42s.
GPE gets my vote then. I consider him reputable and supports this forum with his advice.
Buy with confidence.
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