Fake 2SK1058 or 2SJ162? - diyAudio
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Old 17th March 2005, 03:23 PM   #1
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Default Fake 2SK1058 or 2SJ162?

Hello all,

Does anyone know of any fake Renesas/Hitachi semi's?

The reason I ask is that I got these from a UK distributor for around 1/2 the price everywhere else was selling them. I haven't seen any confirmed genuine SK1058 or SJ162 so was wondering if somebody could have a quick look at these pictures to see if they bear any resemblance to your own.

Click the image to open in full size.
Note on the SJ162 there is a small Hitachi logo, yet on the SK1058 there isn't. I've checked the writing to see if its laser etched and whilst you can remove the grey ink you can still read the etching in the right light, meaning is physically burnt into the plastic and looks neat and tidy.

Click the image to open in full size.
To the rear there appears to be glue residue on the joint between the case and the back plate. Is this normal on your genuine part?

Thanks
Ant
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Old 17th March 2005, 03:24 PM   #2
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Curiosity got the better of me

I decided that I'd rather kill 4 worth of semi conductor than my speaker or other components.

This is a picture of a 2SK1058 that I've just cracked open:
Click the image to open in full size.

The die size is 4mm squared. Does this sound about right?
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Old 18th March 2005, 01:29 AM   #3
Leolabs is offline Leolabs  Malaysia
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I did come across this:
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Old 18th March 2005, 01:32 AM   #4
Leolabs is offline Leolabs  Malaysia
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and this:
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Old 18th March 2005, 03:15 AM   #5
BrianL is offline BrianL  United States
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Ant,

If it is ink marked, then it is not laser marked.

I would be suspicious of the one without a logo as
companies virtually always put on a logo of some sorts
unless the part is physically too small. But then, I doubt
any pirates would have any ethical issues with putting
on logos...

I know for a fact that if you buy between 300 and 400
in the USA, you can get these for about $3 ea. There
are several legitimate people in the USA who sell
to hobbyists for about $8 ea.

I spend most of my time with ICs, so I can't really say
for certain if the size die you see is smaller than it
should be. I do know that lateral MOSFETs are quite
a bit larger than a comparably rated vertical MOSFET
(i.e., International Rectifier)

Sorry I can't be more helpful
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bel
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Old 18th March 2005, 03:52 AM   #6
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They look genuine from what I can see.

There is a small Hitachi logo on my parts (2SJ162 and 23K1058) and otherwise the devices are identical to those you have posted.







-Matt
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Old 18th March 2005, 03:32 PM   #7
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Thanks for the replies.

I'm going to give them a go into a dummy load once the PCB's are done and soldered up.

Hopefully all goes well.
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Old 18th March 2005, 03:42 PM   #8
AndrewT is offline AndrewT  Scotland
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Hi,
mine have just arrived via Rapid and look the same!!!
Good luck with your testing.
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Old 19th March 2005, 04:24 AM   #9
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I picked up a bunch of purported 2SJ162s from Electronic Goldmine that look almost exactly like the units pictured in this thread. All markings are laser-etched, which means you have to have the part slantwise in strong light in order to read what's there. A suspicious person whould check to make sure these aren't bipolars marked as MOSFETs. The gate to source should read open with a VOM, and there should be a diode junction reading with the VOM connected from drain to source and the gate to source shorted together. I just did so with one of the devices. The gate to source reads open like it should, but the intrinsic diode reads like an N-Channel device. I checked with a real diode just to make sure of the VOM polarity. I must conclude that the devices I have are fakes, re-marked N-channel vertical devices.

I have to take the above statement back, as I just checked the 2SJ162 pinout. The source is the tab/center lead, thus the devices could be p-channel as marked and may be legit. Now all I need to do is to find some 1058s to snuggle up next to them....
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