Possible Fakes? Plz take a look!

stigla · 4th July 2003, 01:48 PM

Hi Guys!

Have read some terrifying stuff about conterfeit transistors going around and then I got this "wonder if mine are fakes" feeling.

Well, I've got the pics below, could you guys coment on them please?

I'm worried about the 2SC2987 in particular, since its legs are thiner and shorter (1mm agains 1,3mm), and the case itself does not match the 2SA1227 in size. In addition, if you see on the lower pic, the back is all plastic!

I've tried the Ascetone test on the SA's and they passed, and the SC's have etched numbers.

I've included a MJL21193 for size comparsion.

I will be using these transitors in a class A amp (2-2,5A current) so if they are fakes then I'm afraid they will blow... (and take other things with them!)

hacknet · 4th July 2003, 04:24 PM

i dare say the mjl is fake. the back of the casing is normally not shiny

Andypairo · 4th July 2003, 06:17 PM

Quote:

Originally posted by hacknet
i dare say the mjl is fake. the back of the casing is normally not shiny

All my MJLs are shiny and they come directly from ON.. do they give away fakes of their own products?

Cheers

Andrea

janneman · 4th July 2003, 06:25 PM

The shiny part is the metal tab to which the die is bonded for heatsinking. It is designed that way.

As for the wire sizes, have you compared those sizes to the data sheet dimensions? Do they match?

Jan Didden

sajti · 4th July 2003, 07:18 PM

Quote:

Originally posted by Andypairo

All my MJLs are shiny and they come directly from ON.. do they give away fakes of their own products?

Cheers

Andrea

The MJL looks nice. My MJLs are exactly same. The others? Hmmmm.... looks interesting....

Sajti

4th July 2003, 01:48 PM	#1
stigla diyAudio Member Join Date: Nov 2001 Location: Trondheim	Possible Fakes? Plz take a look! Hi Guys! Have read some terrifying stuff about conterfeit transistors going around and then I got this "wonder if mine are fakes" feeling. Well, I've got the pics below, could you guys coment on them please? I'm worried about the 2SC2987 in particular, since its legs are thiner and shorter (1mm agains 1,3mm), and the case itself does not match the 2SA1227 in size. In addition, if you see on the lower pic, the back is all plastic! I've tried the Ascetone test on the SA's and they passed, and the SC's have etched numbers. I've included a MJL21193 for size comparsion. I will be using these transitors in a class A amp (2-2,5A current) so if they are fakes then I'm afraid they will blow... (and take other things with them!)

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4th July 2003, 04:24 PM	#2
hacknet diyAudio Member Join Date: Nov 2002 Location: sg	i dare say the mjl is fake. the back of the casing is normally not shiny

4th July 2003, 06:25 PM	#4
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 6	The shiny part is the metal tab to which the die is bonded for heatsinking. It is designed that way. As for the wire sizes, have you compared those sizes to the data sheet dimensions? Do they match? Jan Didden

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