MJE15032/33 Genuine or Fake?? - diyAudio
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Old 13th March 2013, 11:54 AM   #1
Aniket is offline Aniket  India
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Default MJE15032/33 Genuine or Fake??

I recently bought some MJE15032/33's from a local shop in Gurgaon(0.3$ each).
I noticed that there was a difference in the appearance of the two, MJE15032 looks like it's printed using stencil or something and on MJE15033 its more of a look like its engraved, also different in the datasheetsfrom ON semi's. Wasn't sure if these were fake or genuine so I broke them open. Now, after looking at the die's of the two it appears that MJE15032 are fakes and 15033 are genuine. Anyone who also come across these fake devices. Any advice is most welcome.

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Aniket
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Old 13th March 2013, 12:08 PM   #2
neychi is offline neychi  Croatia
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The first one is manufactured in Philippines I think, and the second is from Nantong-Fujitsu factory in China. The both looks genuine
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Last edited by neychi; 13th March 2013 at 12:28 PM.
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Old 13th March 2013, 12:33 PM   #3
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Originally Posted by neychi View Post
The first one is manufactured in Congo and the second is from Nantong-Fujitsu factory in China. The both looks genuine
Since Onsemi dont have manufacturing facilities in either of those 2 locations (as in 2010 and 2013 info seems same) how can they be genuine.
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Old 13th March 2013, 12:58 PM   #4
neychi is offline neychi  Croatia
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Older stock I guess. Look at the page 1 on the bottom and page 4.
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Last edited by neychi; 13th March 2013 at 01:01 PM.
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Old 13th March 2013, 02:03 PM   #5
JMFahey is online now JMFahey  Argentina
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1) both transistors shown look genuine, although using slightly different process.
The 15033 has "pitted surface" tab, brighter (looks like nickel) and visible copper has been punched with a flattening tool, which leaves lots of "needle pricks" .
The 15032 has duller tab , looks tinned, visible copper is free of pin pricks.
Anyway the transistor die looks the same, and is tin soldered on both.
Fakes are usually covered by a drop of white substance, looks like epoxy but is somewhat elastic.
Some kind of silicone?
Look at:
Transistores Falsificados.
Counterfeit Transistors
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Old 13th March 2013, 02:39 PM   #6
Aniket is offline Aniket  India
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Thanks all for your input. At least now I am rest assured to use these devices and continue to purchase from that shop. He's been serving me for past 10 years and almost none of the devices he gave have failed till now. I made an amplifier for my cousin using 2n3773's i bought from that shop, and that amplifier is working great from last 7 years even after taking a lot of abuse and is often pushed hard.

Thanks & Regards,
Aniket
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Old 13th March 2013, 05:51 PM   #7
HighTec is offline HighTec  Croatia
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Yep, like JMFahey already mentioned, ON Semi transistors have clean dull tabs and leads. This is the first thing you should look at. If the leads are tinned or poorly tinned, shiny then leave them and run for your life!
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Old 13th March 2013, 07:47 PM   #8
Mooly is offline Mooly  United Kingdom
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Is Beryllium oxide still used in semiconductors to aid heat transfer ? I've not seen mention of it for years now.

If it is then devices should never be cut open as the dust produced is highly toxic.
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Old 29th August 2013, 09:50 AM   #9
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Dear Aniket,

I live in Lucknow and too require the transistors under reference. Can you give me the address of the shop so that I can request him to send the transistors by post.

Thanks
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Old 29th August 2013, 12:56 PM   #10
wg_ski is online now wg_ski  United States
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Originally Posted by Mooly View Post
Is Beryllium oxide still used in semiconductors to aid heat transfer ? I've not seen mention of it for years now.

If it is then devices should never be cut open as the dust produced is highly toxic.
I doubt BeO is used in RoHS compliant devices. That's one of the things they wanted to get rid of. These are the G types. They probably don't have it in fakes either because it's an extra expense to put in a heat spreader.

The die is the right size, the flange is copper, and the passivation and die attach processes are good (when trying to break it apart, you end up cracking the die because everything is well-bonded). Fake is highly unlikley.
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