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Author Topic: Data sheet(s)  (Read 1356 times)
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Pavos
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« on: December 08, 2017, 03:28:58 03:28 »

I am looking for data sheets for the BUW83D. It sould be a NPN darlington but I am not sure. Manufacturers logo looks like ST but at the official web pages no data about it.
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StefDrums
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« Reply #1 on: December 08, 2017, 05:30:47 05:30 »

Hello, can you provide us more data?
- package
- marking
- picture

Thanks!
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PICker
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« Reply #2 on: December 08, 2017, 06:38:13 06:38 »

No infos about BUW83D, some parameters/schematics about BUW81/A NPN Darlingtons:

BUW81 Si npn 80W 600V 600V 8V 10A 150>C - - 200MIN TI TO3 Darlington Power BUT16
http://www.semicon-data.com/transistor/tc/bu/BUW81.html

BUW81A Si npn 80W 600V 800V 8V 10A 150>C - - 200MIN TI TO3 Darlington Power BUT16
http://www.semicon-data.com/transistor/tc/bu/BUW81A.html
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vern
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« Reply #3 on: December 08, 2017, 06:40:49 06:40 »

you sure it is marked BUW83? maybe it's BUW88, BUW86 or BDW83?
I have old ST catalogs and could not find anything.
What kind of a transistor is it, what housing? Is it small or power?
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Pavos
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« Reply #4 on: December 08, 2017, 01:51:27 13:51 »

Hello,
thank you for replies.
Yes, it is marked BUW83D. Picture is attached.
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fpgaguy
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« Reply #5 on: December 08, 2017, 08:21:26 20:21 »

could these be some relative ?
http://www.iscsemi.cn/list/?89_1.html

sure looks like ST logo though

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PICker
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« Reply #6 on: December 09, 2017, 04:03:36 04:03 »

is it like this one?
http://www.donberg.ie/catalogue/semiconductors/semiconductors_bd-bt/bdw_83d.html
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Pavos
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« Reply #7 on: December 09, 2017, 09:25:34 09:25 »

I'm not sure is it similar like BDW83D.
I'll try to test / measure a few basic DC parameters in next few days.
I'll share results when I finish it.
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PICker
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« Reply #8 on: December 11, 2017, 12:30:59 00:30 »

Nothing about BUW83D, it seems to be an electronic mistery
https://www.fabian.com.mt/en/products/webshop/bycategory/980/name/asc/18/3/page-1.htm
https://www.fabian.com.mt/en/products/webshop/bycategory/980/name/asc/18/2/page-2.htm
https://www.fabian.com.mt/en/products/webshop/bycategory/980/name/asc/18/2/page-3.htm
Try to study your transistor in comparison with other darlingtons.
Good luck!
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bigtoy
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« Reply #9 on: December 12, 2017, 11:43:50 23:43 »

That's a good mystery. I've sent an email to a friend at ST; we'll see if they have any information.
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bigtoy
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« Reply #10 on: December 20, 2017, 10:38:27 10:38 »

I got a reply from my contact at ST. They have nothing in their archives.
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PICker
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« Reply #11 on: December 20, 2017, 11:02:07 11:02 »

This is a real mistery!
 Shocked
Did you try to analyze the transistor's parameters with a DMM?
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sphinx
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« Reply #12 on: December 20, 2017, 11:31:57 11:31 »

try to find logo on similar ST transistors from same age and see if logo looks the same i have found some
logos from ST that does not look the same could be that those are newer and modified so it might
not be a real ST transistor. i will look among my parts and see if i have ST transistors from same age, and i
will have a peek at the logo tomorrow.
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sphinx
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« Reply #13 on: December 27, 2017, 11:12:20 11:12 »

I have looked at transistors with ST logo among my parts, the logos i have seen are in not in any way
similar to the one you got. They didn't have any lines like yours just a greyish etched area like on the
attached picture.

Maybe someone else can confirm/deny this.

regards

i found a better picture showing this
« Last Edit: December 27, 2017, 11:17:03 11:17 by sphinx » Logged

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Pavos
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« Reply #14 on: January 28, 2018, 02:17:41 14:17 »

BUW83 is NPN darlington.
Measured base and collector currents with VCE =5 V and calculated DC current gain:

Ic fA]               Ib [mA]           DC hFE
0,1                   0,225              444
0,2                   0,228              877
0,3                   0,231            1298
0,4                   0,234            1709
0,5                   0,236            2118
1                      0,251            3984
1,5                   0,296            5067
2                      0,369            5420
2,5                   0,474            5274
3                      0,611            4910
3,5                   0,8               4375
4                      0,951           4206

It seems that BUW83D is very similar to BDW83D or BDV67D but as sphinx said - vendor is big mistery.
Thanks for your effort.
   
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sphinx
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« Reply #15 on: January 28, 2018, 02:35:30 14:35 »

just a weird thought could it be the logo is some sort of cyrilic letters
perhaps some east european country cyrilic letters, just a weird
feeling i just got
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« Reply #16 on: January 28, 2018, 04:17:38 16:17 »

just a weird thought could it be the logo is some sort of cyrilic letters

For me it is definitively a ST marking. The "VW CC" after the logo can be seen on a lot of ST transistors (I don't know what it means). And the "MAR 135" on the last line is also typical of ST. MAR is the factory code for their factory in Morocco (MARoc), 135 is the production date code. But the mystery remains on why we cannot find it somewhere on the web.
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Pavos
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« Reply #17 on: January 29, 2018, 11:58:40 11:58 »

Definitely, after comparison the original ST and BUW83D  ST logos (by magnifying glass) it seems that they aren't  completaey identical.
Maybe BUW83D ST logo is forged.   Sad
Who knows ...
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