- component ID help - 2 Updates
| Dave McGuire <mcguire@lssmuseum.org>: Jul 23 07:04PM -0400 Hi folks, I'm looking to identify what I think is a transistor, in a TO-72 package (TO-18 with four leads), in an old Victoreen radiation survey meter. The number is "ITS 30487". It's also marked "7736" which I assume is a date code. Can anyone tell me what this is? Thanks, -Dave -- Dave McGuire, President/Curator Large Scale Systems Museum New Kensington, PA |
| Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>: Jul 23 11:50PM -0400 On 2023-07-23 19:04, Dave McGuire wrote: > Can anyone tell me what this is? > Thanks, > -Dave Probably an internal part number. BITD transistors were commonly marked with customer part numbers. (Around 1982, I was working in a group of RF engineers, and a lot of the parts available for us to use had cryptic part numbers like that. I assume that one of the leads is connected to the case (the usual situation). If it's the front end of a proportional counter, it might be a FET such as a 2N4117A JFET or a 3N163 MOSFET. For a Geiger counter, it would probably be something a bit more robust such as a 2N2222. If none of the leads is connected to the case, it could be something less common, such as a dual-gate FET. I used to use a lot of 3N201s in that package. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com |
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