Fake *******ING "MOTOROLA" Transistors - Page 2

Eva · 10th January 2006, 03:04 AM

This picture shows a genuine MJ1502x (the base bonding wire was accidentally broken while opening the case).

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...

flg · 10th January 2006, 03:27 AM

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

jaycee · 10th January 2006, 05:45 AM

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

-_nando-_ · 10th January 2006, 05:49 AM

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 !

Shaun · 10th January 2006, 05:59 AM

To get around this issue, I've been getting my transistors directly from ONSemi.

jpnascim · 10th January 2006, 09:06 AM

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 !

edl · 10th January 2006, 09:08 AM

Dear folks,

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

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

Regards,

testlab · 10th January 2006, 12:03 PM

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.

K-amps · 10th January 2006, 01:13 PM

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?

K-amps · 10th January 2006, 01:16 PM

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.

10th January 2006, 05:59 AM	#15
Shaun diyAudio Member Join Date: Aug 2001 Location: Cape Town, South Africa	To get around this issue, I've been getting my transistors directly from ONSemi. __________________ Shaun Onverwacht \|\|\|\|\|\|\|\|\|\| DON'T PANIC \|\|\|\|\|\|\|\|\|\|

10th January 2006, 12:03 PM	#18
testlab diyAudio Member Join Date: Dec 2005 Location: Grand Rapids MI	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. __________________ It's not whether you win or lose, it's how you lay the blame.

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10th January 2006, 03:04 AM	#11
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	This picture shows a genuine MJ1502x (the base bonding wire was accidentally broken while opening the case). 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...

10th January 2006, 03:27 AM	#12
flg diyAudio Member Join Date: Jul 2005 Location: North East	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

10th January 2006, 05:45 AM	#13
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	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

10th January 2006, 05:49 AM	#14
-_nando-_ diyAudio Member Join Date: Dec 2005 Location: Sao Paulo	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 !

10th January 2006, 09:08 AM	#17
edl diyAudio Member Join Date: Oct 2004	Dear folks, Photo of the inside of genuine (Onsemi sample) MJ15003: http://sziget.mine.nu/~danko/aramkor/dscn7342.jpg Regards,

10th January 2006, 01:16 PM	#20
K-amps diyAudio Member Join Date: Nov 2003 Location: Indiana	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.