I am inquiring about the authenticity of the MJE350 components in question. While I am aware that they do not originate from "ON," I am curious about their reliability. Typically, I tend to steer clear of Chinese-made components as they often exhibit characteristics of imitation from afar. However, I've noticed that this particular store boasts 51 reviews, all of which praise the quality of these components. This situation has piqued my suspicion, as it seems somewhat anomalous.
Could someone identify the brand of the item in the photo I posted, please? I'm particularly interested in avoiding Chinese brands, so any assistance in providing information would be greatly appreciated.
First Red light:
This is an obsolete product.
Second: It's not an ONSEMI
Third: No reputable retailer has it in stock (since it's obsolete)
Fourth: It's a very popular transistor thus making it attractive to fake.
And it's not the G-version which is in backorder everywhere.
Which indeed makes me think it is fake.
Hugo
This is an obsolete product.
Second: It's not an ONSEMI
Third: No reputable retailer has it in stock (since it's obsolete)
Fourth: It's a very popular transistor thus making it attractive to fake.
And it's not the G-version which is in backorder everywhere.
Which indeed makes me think it is fake.
Hugo
Why even bother, just buy from trusted sources.
Anyone can give their own store good reviews. It means nothing.
Amazon reviews are especially junk.
Anyone can give their own store good reviews. It means nothing.
Amazon reviews are especially junk.
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You can’t call the OP’s parts “fake”. They make NO claim to be original ONSemi parts - they have another maker’s logo. Are they any good? You’d have to test them. They may or may not meet MJ15032 spec, or have the margin to it that ON parts would normally have. Chances are they are BETTER than an outright fake that is marked as an ONSemi part. Usually those will just plain blow up because they’re not even close. This may actually be “close”.
The transistors in the first picture is made by Jilin Sino-microelectronics Co., Ltd, are they good? I have no idea, it is a real company that exists and they put their name on it so so maybe.
I have no idea, and time will tell if they are any good. If they are something like ISC, it’s a mixed bag. They do a decent job trying to second source, but they CANNOT always duplicate high performance products. For the run of the mill obsolete stuff they’re not too bad. Their copies of the Sanken MT200’s, however, are NOT up to snuff.
I would give them a try, in something where the performance would show, but nothing critical you couldn’t stand to lose if they went up in smoke or caused something else to. Breadboard one of the old classic designs that runs on about +/-35 and uses low gain low speed outputs like 2N3055’s (And use expendable ones). Put these in the driver position of course. If they are a decent speed anything like the original, it will sound good. If they put TIP31 dies in there (like a fake would) it is going to sound awful. And measure poorly. Fuzzy highs, lots of crossover distortion that you can’t make go away. This is effectively the “Indianajo’s ST120 Test”. For an SOA test, wire it as a 200 mA current source on a 100V supply and see if it takes it. Heat sinked of course, and fuse (or current limit your bench supply) at half an amp. You’ll know in less than a second, so limit the test to about that long before it heats way up.