Help identify this transistor?? - UK Vintage Radio Repair and Restoration Discussion Forum

Electricdreams · 6th Apr 2015, 9:32 pm

It could be Thyristor, triac, I don't know,

There isn't a schematic for the Compaq Portable Power supply board and I am just frustratingly replacing what appears to be broken.

Most of the information has been burnt off leaving some, and I am hoping someone out there would recognise it!

I have taken a photo of both sides..

cmjones01 · 6th Apr 2015, 11:09 pm

Well, it's by National Semiconductor, and in a TO126 package. I googled for 'National Semiconductor TO126' and many of the resulting images show 'E C B' along the bottom marking the pinout. I think the 'B' visible at the bottom of your transistor is Base, then. So we know it's bipolar. Beyond that, I think reverse engineering is probably the way forward.

Chris

6th Apr 2015, 9:32 pm	#1
Electricdreams Hexode Join Date: Mar 2008 Location: Manchester, UK. Posts: 478	Help identify this transistor?? It could be Thyristor, triac, I don't know, There isn't a schematic for the Compaq Portable Power supply board and I am just frustratingly replacing what appears to be broken. Most of the information has been burnt off leaving some, and I am hoping someone out there would recognise it! I have taken a photo of both sides.. Attached Thumbnails __________________ What have you bought now??

6th Apr 2015, 11:09 pm	#2
cmjones01 Nonode Join Date: Oct 2008 Location: Warsaw, Poland and Cambridge, UK Posts: 2,678	Re: Help identify this transistor?? Well, it's by National Semiconductor, and in a TO126 package. I googled for 'National Semiconductor TO126' and many of the resulting images show 'E C B' along the bottom marking the pinout. I think the 'B' visible at the bottom of your transistor is Base, then. So we know it's bipolar. Beyond that, I think reverse engineering is probably the way forward. Chris __________________ What's going on in the workshop? http://martin-jones.com/