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My Transistors, original or copy?
My Transistors, original or copy?
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Old 15th January 2019, 02:38 AM   #1031
anatech is online now anatech  Canada
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My Transistors, original or copy?
Hi David,
Imagine my surprise when I received some fakes!

-Chris
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Old 23rd January 2019, 03:13 PM   #1032
grunf is offline grunf  Croatia
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Hi

Is 2SD774 from the image original or fake?
Does not match the image from PDF. hFE is high, the value ranges from 400 to 500.
Attached Images
File Type: jpg IMG_20190123_165313.jpg (319.1 KB, 303 views)
Attached Files
File Type: pdf 2sd774.pdf (161.5 KB, 18 views)
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Old 23rd January 2019, 04:55 PM   #1033
peranders is offline peranders  Sweden
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My Transistors, original or copy?
Quote:
Originally Posted by rediceman View Post
The apology for my english is not good.

There is a problem that confuses me. Some transistors draw magnets.
is this normal ? probably have iron instead of copper.It looks in the picture.
Nickel is also magnetic.
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Old 23rd January 2019, 04:57 PM   #1034
anatech is online now anatech  Canada
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My Transistors, original or copy?
Hi grunf,
Tough call. They are clearly not real if NEC only used the case style in the data sheet. They do look suspiciously like new leads may have been attached.

Normally, the remarks I have seen have lower beta, ~200 or lower. So to measure a high beta suggests they might be real, or at least from a stock that has more desirable characteristics.

-Chris
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Old 23rd January 2019, 07:45 PM   #1035
petoluk is offline petoluk  Czech Republic
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Quote:
Originally Posted by petoluk View Post
Huijzer have a lot of interesting 2Sx transistors in stock, but now I'm hesitant to place another order with them...
Well, fool me once, etc. The pictures [below] speak for themselves... Avoid Huijzer at all cost!
Quote:
Originally Posted by anatech View Post
What do I do with the fakes? I use a 4 pound hand sledge hammer that does a fine job of distressing the cases. It's not worth having fakes turn up unexpectedly, or having another hobbyist "score them" from my garbage. I assure you, mine are not useable if they are fakes. It is very important that you destroy fakes. Even if you pay a lot for them (I know it hurts, but not as much as having to troubleshoot non-working projects because of a part you knew was a bad one).
Seems I'll have to follow your example, as the vendor stopped communicating with me when I told them I want to return these.
Attached Images
File Type: jpg A970GR.jpg (164.8 KB, 309 views)
File Type: jpg A1316BL.jpg (209.4 KB, 306 views)
File Type: jpg C1775AE.jpg (195.7 KB, 306 views)
File Type: jpg C3329BL.jpg (175.0 KB, 302 views)
File Type: jpg D786.jpg (159.1 KB, 158 views)
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Old 24th January 2019, 03:18 AM   #1036
anatech is online now anatech  Canada
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My Transistors, original or copy?
Seeing those group shots tells me that they are for sure fakes. Sorry, I know that isn't the news you wanted to hear.

-Chris
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Old 24th January 2019, 04:19 AM   #1037
davada is offline davada  Canada
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Doesn't seem like they can get the print in the right spot. Never seen re-leaded parts before. Wonder if they are pulls.
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Old 24th January 2019, 07:54 AM   #1038
petoluk is offline petoluk  Czech Republic
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Quote:
Originally Posted by anatech View Post
Seeing those group shots tells me that they are for sure fakes. Sorry, I know that isn't the news you wanted to hear.

-Chris
No worries - I know they're fakes, but I'd better explain my reasoning:

On top of the obviously different font types:

- A970: I've seen a lot of various genuine Toshiba transistors over the years, but I've never seen one that would use a 3-digit date code
- A1316 & C3329: the former sanded to oblivion, the latter... I just can't find words to express how horribly poor quality imitations they are
- C1775: AFAIK, the 3-letter Hitachi date codes always start with a digit, representing the year [as you can see in the smaller photo of genuine parts from different production years in the corner]
- D786: the hFE rank is supposed to be printed on the case

I didn't even bother to test these electrically / compare against data sheets...
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Old 24th January 2019, 01:34 PM   #1039
anatech is online now anatech  Canada
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My Transistors, original or copy?
Hi petoluk,
I was thinking the same thing. I especially liked the ones filed into a wedge shape!

Try to enjoy the destruction of these. A fire might be a good way to a mass extinction for those non-conforming parts. You can also experiment. A very short time in a microwave really messes up electronic components and really does a number on stuffed circuit boards. Keep the cooking time short, Maybe even include a cup of water to avoid damaging the nuker. Remember, this experiment is done at your own risk.

-Chris
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Old 3rd March 2019, 06:53 AM   #1040
grunf is offline grunf  Croatia
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I have some suspicious transistors, the first should be Hitachi and the other Sanyo. hfe is for both ok. What do you think, are they original?
Attached Images
File Type: jpg IMG_2019.jpg (334.4 KB, 142 views)
Attached Files
File Type: pdf NPN_2SD667_80V_1.0A_0.9W_Hfe160_TO-92MOD.pdf (37.6 KB, 14 views)
File Type: pdf 2SA1249.PDF (96.7 KB, 10 views)
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