I need to find a replacement transistor. The only number I have to go by is a manufacturer (of the unit, not the transistor) part number from 1974 which of course leads nowhere. I know it's a silicon NPN TO-220 case used as a relay driver. I know the voltages, I can estimate the current, so I can search for all those parameters but get hundreds of candidates. Is there a way to further narrow down the field to just those with an EBC pinout without having to click through to every single data sheet?
The best way is to fine tune your search parameters so that the candidate list is reduced. With reduced tight list you really only need to look at data sheets till you find a suitable part....no need to look at every part data sheet.
When considering that it is used as a relay driver do be careful to look at the driving circuit as well. There is a possibility that the component that you are looking to replace is a Darlington with a high current gain.