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Electronics Forum / Electronics / September 2008how to find equivalent transistor
Hi, I need to replace a 8050 transistor. I found the data sheet on the web but no source to buy one. (NPN TO92 IC 800mA 30V switching/audio, drives a siren pieco) What's a proper way to find an equivalent transistor that's actually available? Cheers Tony >Hi, > [quoted text clipped - 6 lines] > >Tony These are just "jelly bean" general purpose transistors: http://www.datasheetarchive.com/pdf-datasheets/Datasheets-5/DSA-87957.pdf A BC337A looks like it might substitute for it: http://www.datasheetarchive.com/pdf-datasheets/Datasheets-12/DSA-228097.pdf Just be careful of the pinout. One is EBC, the other is CBE. - Franc Zabkar  SignaturePlease remove one 'i' from my address when replying by email. >> Hi, >> [quoted text clipped - 9 lines] > These are just "jelly bean" general purpose transistors: > http://www.datasheetarchive.com/pdf-datasheets/Datasheets-5/DSA-87957.pdf Using some random NPNs from my junk box produced a lot of dead bodies though:-) > A BC337A looks like it might substitute for it: > http://www.datasheetarchive.com/pdf-datasheets/Datasheets-12/DSA-228097.pdf > > Just be careful of the pinout. One is EBC, the other is CBE. > > - Franc Zabkar I can get a BC337 from Altronics. Will watch pinout:-) Easier than I thought! Thanks! Tony >> Hi, >> [quoted text clipped - 16 lines] > > - Franc Zabkar Tried the BC337. Blew up after 20 seconds:-) Was worth a try for $0.35 Tony "TonyS" > What's a proper way to find an equivalent transistor that's actually > available? ** There is no simple procedure for such a complex task - anyone who tells you there is a fool or a damn liar. .... Phil > "TonyS" > [quoted text clipped - 5 lines] > > .... Phil You are right. When data sheets where still in books I used to have a book with tables that showed equivalent devices by different manufacturers. I was hoping that the web has something like this to offer. In this case hFE is important. The driving circuit is just 2*4069 inverters in parallel over 100 Ohms. The load is an unknown transformer. Tony > Hi, > [quoted text clipped - 7 lines] > > Tony The 8050 is a fairly good spec for a TO92 device, if a TO126 part will fit the available space it would be much easier to find a device that meets or exceeds the most important parameters. >> Hi, >> [quoted text clipped - 11 lines] > the available space it would be much easier to find a device that meets or > exceeds the most important parameters. Found a good one in TO92, 2STX1360. http://www.st.com/stonline/products/literature/ds/11763.pdf Vce sat 150mV typ @ 2A. Don't know where to get it, apart from Digikey... There would be space for a larger package though, any suggestions? Already feeling a bit silly trying to fix the thing;-( Tony >>> Hi, >>> [quoted text clipped - 19 lines] > > Tony One thing to watch is the pin-out, the datasheet I found for the 8050 (SS8050) shows centre pin base, the ST part and also the TO126 option I suggested both have centre pin collector, The TO92 or TO92L would be easier to bend the pins to fit than a TO126 but if you're never going to have to change the transistor again it might be worth cutting and patching the tracks. |
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