THX-1138 Posted September 11, 2008 Share Posted September 11, 2008 I have been given a quantity of TO-92 transistors with the National Semiconductor brand on them. However, I cannot identify them. When I asked National, they told me they sold their discrete line to Fairchild in 1997. The Fairchild Web site isn't very tech-question friendly, and singularly bereft of eddresses, so I'm going to ask here in a better hope of getting an answer. There are two types; all have colour codes on the back: 427 A05 yellow-red-purple 333 A05 silver-silver-silver Anyone have any inkling? Only three colour bands doesn't sound particularly useful, but.. Thanks! Link to comment Share on other sites More sharing options...
DrP Posted September 11, 2008 Share Posted September 11, 2008 I don't know what the colours represent in Ohms, but could you not put a small votage through one of them with an ammeter linked to it and work them out? Link to comment Share on other sites More sharing options...
YT2095 Posted September 11, 2008 Share Posted September 11, 2008 I`v just had a look through my semiconductor index and there`s nothing by Fairchild in a To-92 case that matches that description. I will say however that most all of the color coded T0-92 devices I`v come across have been FETs (P and N channel). it would be a good idea to buy or borrow a multimeter with a transistor test socket on it, at least you`ll be able to find out what sex it is, it`s gain and EBC layout. Link to comment Share on other sites More sharing options...
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