Audio Power Transistors - Buying in Bulk

Hi All,

Does anyone have a solid opinion on the quality of Multicomp Pro MJ15003 and MJ15004 power transistors (Newark# 76AH5818 and 76AH5819)? I want to stock up on these parts as I use them quite a bit and the Multicomp Pro ones come in at about half the cost of the other name brand devices. I use these parts for vintage audio amplifier repair and the occassional amp build from scratch. Not exactly critical applications, but I'd like to get some assurance that they are at least worth the money. Otherwise, I may as well just spend the extra and get ONSEMI. Has anyone tested this Multicomp Pro transistors to see what conditions they fail under as compared to the ONSEMI ones?

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anniel747 over 1 year ago

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anniel747 over 1 year ago

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anniel747 over 1 year ago in reply to anniel747

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0 dank123 over 1 year ago in reply to anniel747

Is that a side-by-side of the multicomp and the onsemi MJ15003/MJ15004?
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0 shabaz over 1 year ago in reply to anniel747

That's a horse of a different color, That's a fake part (the large distributors cannot usually supply fakes unless something goes seriously wrong). A very high percentage of semiconductors from China via AliExpress etc., are fake, but I've never seen a fake from Farnell/Newark (not saying it's never occurred for anyone, but it's exceedingly rare.

By 'fake' I mean that die could say be a deliberately lower-cost one (e.g. smaller and cannot support the same spec as the expected part), or is an old part (possibly faulty).
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0 dank123 over 1 year ago in reply to shabaz

Do you have access to the Multicomp parts Shibaz? Could you open the metal case and post a pic? That would clear everything up once and for all. The specs sheet of the multicomp MJ15003/004 appear almost the same as the ONSemi part. Otherwise, I'll just have to place an order and open them up myself. Would Newark send me a couple samples for this experiment?
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0 shabaz over 1 year ago in reply to dank123

Unfortunately I don't have any : ( I've never received samples from Farnell/Newark, you could try phoning their sales desk, but I don't know if they can provide that or not. If you do manage it, it would be great if you could upload the photos of the internals here to help others too.
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anniel747 over 1 year ago in reply to shabaz

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0 shabaz over 1 year ago in reply to anniel747

"Why would you think it's a fake?"

Because your photo was taken from a counterfeit transistor web-page that explains it in black-and-white:

As you can see from the red highlighted text, the purchaser was caught in a bait-and-switch.

That's very different from the Multicomp part, which will, in all likelihood, meet the (limited) datasheet spec that it is supplied with.

"Many parts sold at Farnell/Newark come from china."

Many fake parts come from China. But the OP is specifically discussing parts from a distributor that will have processes in place to prevent bait-and-switch.
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