My Transistors, original or copy? - Page 9

halfgaar · 12th April 2007, 11:37 PM

Have a look at this. It even has a subsection about your specific transistors.

Netlist · 13th April 2007, 07:48 AM

There are no indications that the IRFP140 is not fake.
Here compared to the IRFP240, a genuine IR part.
As far as I found, International Rectifier exclusively uses the TO-247AC case style.
The IRFP140 is a TO-247 PSI 340L-02.

Front:

Netlist · 13th April 2007, 07:49 AM

Back:

cravings · 13th April 2007, 08:04 AM

hello and thank you,

yes that was one of the first pages i came across while reading up on this. He has a lot of great information on that site.

I am still curious as to whether or not Toshiba ever actually made transistors that look exactly like these ones with the shiney surface area, or whether anyone has identified another manufacturer who's packages are being branded as Toshiba.

Was there ever a batch of genuine Toshibas with this shiney area and very clear lettering on the package?

AndrewT · 13th April 2007, 08:56 AM

Hi,
my Tosh 1943/5200 have a plain matt surface and the printing is very difficult to read.
Are they laser etched?

The backs of mine look nothing like those pics.
Mine have mickey mouse type ears at the top due to the top line having a depressed edge and the sides have an indent.
The bottom edge is completely straight.

Nordic · 2nd May 2007, 06:10 PM

I have a bunch of TIP42 they all measure hfe between 130 and 220 most over 200.... datasheet says it should be 15-75...

ARE THEY FAKE?

My toshiba sc5200s are pretty clearly labled..lazer etched fairchild 1943 has harder to read lettering - faint ink?

MikeB · 2nd May 2007, 06:29 PM

At the beginning of this thread is photo of genuine Toshibas...
http://www.diyaudio.com/forums/attac...amp=1152129483
Compare yourself!

Mike

Nordic · 2nd May 2007, 06:43 PM

how old are those?

MikeB · 2nd May 2007, 07:36 PM

Quote:

Originally posted by Nordic
how old are those?

~1.5years. I am absolutely sure these are originals.

Nordic · 2nd May 2007, 09:48 PM

No, No, I believe you, just thought they may have changed since...

a ny clue on those tip42's of mine with the huge hFE?

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12th April 2007, 11:37 PM	#81
halfgaar diyAudio Member Join Date: Mar 2005 Location: Netherlands, Groningen	Have a look at this. It even has a subsection about your specific transistors.

13th April 2007, 08:04 AM	#84
cravings diyAudio Member Join Date: Apr 2007	hello and thank you, yes that was one of the first pages i came across while reading up on this. He has a lot of great information on that site. I am still curious as to whether or not Toshiba ever actually made transistors that look exactly like these ones with the shiney surface area, or whether anyone has identified another manufacturer who's packages are being branded as Toshiba. Was there ever a batch of genuine Toshibas with this shiney area and very clear lettering on the package?

13th April 2007, 08:56 AM	#85
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, my Tosh 1943/5200 have a plain matt surface and the printing is very difficult to read. Are they laser etched? The backs of mine look nothing like those pics. Mine have mickey mouse type ears at the top due to the top line having a depressed edge and the sides have an indent. The bottom edge is completely straight.

2nd May 2007, 06:10 PM	#86
Nordic diyAudio Member Join Date: Sep 2005	I have a bunch of TIP42 they all measure hfe between 130 and 220 most over 200.... datasheet says it should be 15-75... ARE THEY FAKE? My toshiba sc5200s are pretty clearly labled..lazer etched fairchild 1943 has harder to read lettering - faint ink?

2nd May 2007, 06:29 PM	#87
MikeB diyAudio Member Join Date: Apr 2004 Location: Gütersloh	At the beginning of this thread is photo of genuine Toshibas... http://www.diyaudio.com/forums/attac...amp=1152129483 Compare yourself! Mike

2nd May 2007, 06:43 PM	#88
Nordic diyAudio Member Join Date: Sep 2005	how old are those?

2nd May 2007, 09:48 PM	#90
Nordic diyAudio Member Join Date: Sep 2005	No, No, I believe you, just thought they may have changed since... a ny clue on those tip42's of mine with the huge hFE?