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Fake or Real Fujitsu Part?
Fake or Real Fujitsu Part?
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Old 20th October 2019, 07:19 AM   #1
SyncTronX is offline SyncTronX  United States
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Default Fake or Real Fujitsu Part?

So I was wondering if any of you have come across some of these parts:


Fujitsu: 2sc2526


The parts I have show to be germanium????
On my Atlas DCA55 tester? WTF Over?
Anyone test any of these?


The actual reading from the DCA55 follow:
1) Hfe = 43 Vbe=0.54V DiodeCheck BC= .489 BE= .497
2) Hfe = 40 Vbe=0.54V DiodeCheck BC= .494 BE= .501


Tested the known good silicon device in the amp:
DiodeCheck BC= .570 BE= .573


Are these "NEW" Fujitsu ring emitters that good that the

PN junction is that low?


I've got New close complimentary Toshiba silicons,
1) BC= .570 BE= .570
2) BC= .558 BE+ .562


Tested the known good device in the amp:
BC=.545 BE=.551


Anyone else Test any of these?


Cheers,
Attached Images
File Type: jpg 01.01 2sc2526.jpg (279.2 KB, 134 views)
File Type: jpg 01.02 2sc2526.jpg (374.0 KB, 134 views)
File Type: jpg 01.03 Amp Transistors.jpg (308.8 KB, 133 views)
File Type: jpg 01.04 2sc2526 B-C junction.jpg (395.1 KB, 130 views)
File Type: jpg 01.05 2sc2526 B-E junction.jpg (398.6 KB, 133 views)
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Old 20th October 2019, 07:27 AM   #2
SyncTronX is offline SyncTronX  United States
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After reading the sticky...
I'll try to measure capacitance of the devices
and compare to known ones in the amp.


No sure how those will measure up and they are too much a pain to remove.


So stay tuned.
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Old 20th October 2019, 07:28 AM   #3
ubergeeknz is offline ubergeeknz  New Zealand
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Perhaps detecting as Germanium due to the vbe below 0.6v?
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Old 20th October 2019, 07:55 AM   #4
dotneck335 is online now dotneck335  United States
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"Fake or Real Fujitsu Part?"
Easy Test:
A) Did you buy it off eBay? FAKE
B) Did you buy it from Mouser/DigiKey? REAL
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Old 20th October 2019, 09:52 PM   #5
SyncTronX is offline SyncTronX  United States
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dotneck335, not necessarily.


Uber, I'm not sure if that is the reason.


But, when I diode check BC to BE,

it reads, below .5V or near .5v.
Yes, Vbe below .5 or there abouts when it

we know its .7V across the PN junction.
Slightly less, .65 or high .57 ect.


I'd like to see if anyone has measured their

devices and compare.


Cheers,
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Old 21st October 2019, 04:37 PM   #6
Mark Tillotson is offline Mark Tillotson
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I think its more like:


eBay: all bets are off (real / real NOS / recycled / fake / non-functional are all possible)

Mouser/Farnell/digikey/etc: real




Anyway the low Vbe is because they are high current transistors and the tester doesn't know this. Vbe depends on
current density, not total device current.
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Old 6th November 2019, 02:25 PM   #7
JeffYoung is offline JeffYoung  Ireland
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Fake or Real Fujitsu Part?
Default Fake or real 2SK2013?

I'm trying to determine if some 2SK2013s I have are genuine or not. The case looks good (although the placement of the 'Y' grade marking is suspect: I think it's usually under the '2').

Fake or Real Fujitsu Part?-2sk2013-jpg

(Pics of other real & fake 2SK2013s can be found here: F5 with 2SK2013/2SJ313. )

I did some manual curve tracing with a couple of bench supplies. This is ID over VGS, with VDS fixed at 10V:

Fake or Real Fujitsu Part?-2sk2013_curve-jpg


While the curve looks about right, note that it's offset to the right by about 1.8V. I know the curve in the datasheet is only representative, but would there be that much variation in VGS?

Thanks,
Jeff.
Attached Images
File Type: jpg 2SK2013.JPG (210.6 KB, 246 views)
File Type: jpg 2SK2013_curve.JPG (79.7 KB, 238 views)
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Old 6th November 2019, 02:33 PM   #8
JeffYoung is offline JeffYoung  Ireland
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Fake or Real Fujitsu Part?
Ooops, meant to start a new thread.

Mods, feel free to move this if you think it worthwhile.

Cheers,
Jeff.
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Old 8th November 2019, 04:25 AM   #9
SyncTronX is offline SyncTronX  United States
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Jeff,

No Need, it's all about fake parts.
But it would be nice if some other folks

would post what they measured.


It goes into the collective IQ of the DIY Brain.


Cheers,
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Last edited by SyncTronX; 8th November 2019 at 04:28 AM.
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