Hi,
I've been handed a very old motor speed controller to repair. I've narrowed it down to this thyristor but it's obsolete,
SES C230E Datasheet:
http://www.alldatasheet.com/datasheet-pdf/pdf/579002/DIGITRON/C230E.htmlI'm looking for a suitable alternative available from stock from Farnell/RS/Mouser/Digikey but I'm not all that familiar with SCR specification.
So far the parameters I'm searching by are
Peak repetitive off state voltage >= 500v
Peak non-repetitive reverse volatge >= 600v
Forward current RMS >= 25A
Peak Surge Current >= 250A
Forward "on" voltage <= 1.9v
Gate Trigger Current < 25mA
Gate Trigger Voltage <1.5V
Holding Current <50MA
Turn On Time ~1uS
Turn Off Time ~23-35uS
I found this one, its a little physically larger (I have room) and the Forward Current is 63A, but I figure the bigger the better there right?
http://docs-europe.electrocomponents.com/webdocs/0a35/0900766b80a35a6a.pdfThe only thing is that it has a holding current of 100mA, I'm not sure if that matters or not.
If I stick to the 50mA max holding current I can't find anything in a stud mount format, that doesn't bother me as there's a large heatsink to mount to anyway. The best I can find is
http://www.mouser.com/ds/2/240/Littelfuse_Thyristor_Sxx35x-63752.pdfSo can anyone tell me if I'm on the right lines and what are the key specifications to look out for when replacing obsolete SCRs?