Fake *******ING "MOTOROLA" Transistors - Page 2 - diyAudio
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Old 10th January 2006, 03:04 AM   #11
Eva is offline Eva  Spain
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This picture shows a genuine MJ1502x (the base bonding wire was accidentally broken while opening the case).

Click the image to open in full size.

The one shown was a very old device (from late 80's) and currently manufactured ones are probably going to look slightly different, but note the size and fringed design of the die, the size and the tickness of the copper coin on which the die is mounted and the absence of any white silicone.

There are threads on fakes and fake identificacion on this forum, and some of them include interesting pictures. Use the search engine and you'll find out...
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Old 10th January 2006, 03:27 AM   #12
flg is offline flg  United States
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Well, if it makes anyone feel any better, I'm gonna tell I'm not sure how interested ON management will be, but they may be interested enough to ask some questions. Are you willing to give them some answers???
In the ealier pics, I noticed the lid of one of these fakes. Was thart the traditional Motorola "BatWing" on the lid? They are very particular about that logo. If it is not perfect they clean them off and do it again! Of coarse I dont' think Moto makes any descretes anymore. That is where ON Semi came from
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Old 10th January 2006, 05:45 AM   #13
jaycee is offline jaycee  United Kingdom
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Motorola havent made transistors in quite a while. The division of Motorola that did discrete parts became OnSemi.

Rod Elliot has good information on fake parts:

http://sound.westhost.com/counterfeit.htm
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Old 10th January 2006, 05:49 AM   #14
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So, all moto discrete transistors are fake? Huh ! Good to know... The most funny is that 80% of fakes are sold with moto or toshiba logo... hehehehe !

Yes, I'm feeling better heheh ! I can't imagine blow my amp because of these fakes transistors... Thank god I discoveried it first !

But anyway, not nice pay for a thing like this, and wasn't cheap !

OFF: Hum, if you want to see, take a look on my 3886's PCB, I finishied right now !
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Old 10th January 2006, 05:59 AM   #15
Shaun is offline Shaun  South Africa
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To get around this issue, I've been getting my transistors directly from ONSemi.
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Old 10th January 2006, 09:06 AM   #16
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Oi Fernando !

Not really. Your dealer may have and old stock for certain parts. Of course it is much riskier to buy parts from companies that have extinguished or changed names. Also risky to buy parts that are not manufactured anymore (such as Toshiba's 2SA1302/2SC1943), you can find them, but probably they are fakes.

Again, my suggestion: pay more and buy from realiable sources. No pain, if something goes wrong you can almost be certain it is your fault (and not the transistor's) and you get maximum performance.

Abraços,

João Pedro


Quote:
Originally posted by -_nando-_
So, all moto discrete transistors are fake? Huh ! Good to know... The most funny is that 80% of fakes are sold with moto or toshiba logo... hehehehe !

Yes, I'm feeling better heheh ! I can't imagine blow my amp because of these fakes transistors... Thank god I discoveried it first !

But anyway, not nice pay for a thing like this, and wasn't cheap !

OFF: Hum, if you want to see, take a look on my 3886's PCB, I finishied right now !
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Old 10th January 2006, 09:08 AM   #17
edl is offline edl  Hungary
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Dear folks,

Photo of the inside of genuine (Onsemi sample) MJ15003:

http://sziget.mine.nu/~danko/aramkor/dscn7342.jpg

Regards,
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Old 10th January 2006, 12:03 PM   #18
testlab is offline testlab  United States
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Part counterfeiting is a real problem, and not just for these manufacturers. Many of the fake parts are sold through brokers that specialize in obselete semiconductors.

I sold some ADC's on eBay a couple of years ago, and I received many e-mails asking if they were the genuine article. Let's hope that kind of activity does not appear on this forum.
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Old 10th January 2006, 01:13 PM   #19
K-amps is offline K-amps  United States
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Quote:
Originally posted by testlab
Part counterfeiting is a real problem, and not just for these manufacturers. Many of the fake parts are sold through brokers that specialize in obselete semiconductors.

I sold some ADC's on eBay a couple of years ago, and I received many e-mails asking if they were the genuine article. Let's hope that kind of activity does not appear on this forum.

ADC's as in Adcom's replacements for the 2sb554/2sd424?
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Old 10th January 2006, 01:16 PM   #20
K-amps is offline K-amps  United States
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I got some MJ21193/94's from AVnet (first tier ON distributor) last year. The 3's were MOT and the 4's were ON. Both were genuine, so basically just because someone has stock of the MOT's does not make them fake... use of common sense overrides this myth.

The pictures on the first post have font that clearly looks fake... good fakes can duplicate the silk screening well... this is clearly a bad one.... lol even fakes have levels.
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