Fake transistors? - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 28th December 2006, 11:46 AM   #1
alexan is offline alexan  Greece
diyAudio Member
 
Join Date: Jan 2005
Location: GR
Default Fake transistors?

Hi
The pictured transistors 2SA1302/2SC3281 arriver yesterday from FUTURLEC eshop.
These were supposed to be MOSPEC brand and I thought that it would be an easy solution and that there isnít possibly a MOSPEC fake since they can make fakes with TOSHIBA brand which are more expensive to sell them with more profit so there is no point in making a fake MOSPEC.
The problem is that the transistors I received have a logo that is similar to MOSPEC but it is different and also the case is much bigger, it should be (as in the mospec datasheet) TO247 (21,5mm x 15,8) but instead this is a TO264 (26mm x 20mm).
I was wondering is anyone recognizes the logo, can it be of another company?
As you can see the logo resembles the MOSPEC logo but the C looks like an A.

Thank you
Alex
Attached Images
File Type: jpg mospec.jpg (45.1 KB, 249 views)
  Reply With Quote
Old 28th December 2006, 12:28 PM   #2
alexan is offline alexan  Greece
diyAudio Member
 
Join Date: Jan 2005
Location: GR
I just measured the capacitance of the transistors with a standard multimeter.

4.83nf for 2SC3281
4.09nf for 2SA1302
  Reply With Quote
Old 28th December 2006, 01:14 PM   #3
singa is offline singa  Singapore
diyAudio Member
 
Join Date: Apr 2004
Location: near
Send a message via AIM to singa Send a message via MSN to singa Send a message via Yahoo to singa
Default mospec 2sa1302/2sc3281

I did not know Mospec had bought the license to make them.The logo looks misleading but the size is correct (TO 264).With counterfeiting widespread I would think Mospec would have use laser marking instead of cheap silkscreen.I guess the only way is to split open the package and look at the die size.
  Reply With Quote
Old 28th December 2006, 02:26 PM   #4
alexan is offline alexan  Greece
diyAudio Member
 
Join Date: Jan 2005
Location: GR
Default Re: mospec 2sa1302/2sc3281

Quote:
Originally posted by singa
I did not know Mospec had bought the license to make them.The logo looks misleading but the size is correct (TO 264).With counterfeiting widespread I would think Mospec would have use laser marking instead of cheap silkscreen.I guess the only way is to split open the package and look at the die size.
Hi
According to the mospec datasheet for these transistors the case should be TO247 as the one in the picture i posted in the first message, toshiba is the one that makes the TO264 (and the fakes too are TO264).
Have you ever seen the mospec logo on a transistor and if so was it like the one on my picture or like the one in the datasheet (which i also have in the lower section of my attached picture in the first post).
Isn't the capacitance high enough, if the waffer was small wouldn't the cap. be less?

Alex
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
More Fake Transistors DieterD Solid State 43 30th October 2011 08:26 AM
fake transistors gain Solid State 14 28th April 2008 02:12 PM
Fake transistors? spooney Car Audio 16 29th February 2008 08:38 PM
fake transistors tinkerbell Solid State 17 19th January 2006 11:51 AM
Fake Transistors MGR Solid State 10 28th October 2002 10:46 AM


New To Site? Need Help?

All times are GMT. The time now is 09:48 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2