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What is the '2S' followed by other letters on Japanese standard transistors?
Posted by - NA - on 26 January 2008 04:40 AM
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Unlike the American EIA JEDEC (and to their credit) the Japanese EIAJ took the time to categorize various transistors. For JEDEC, as an example, the 2N prefix does not allow any definition of category, so a 2N4401 is NPN, 2N4403 is
Each 2S number is registered with a particular transistor manufacturer. Only one company would have the same number. For example, 2SA1037A only belongs to ROHM Co., Generally, the 2SB and 2SD devices are lower frequency operation. In many cases they are higher power devices; with the switching characteristics not defined in detail quite as often as is more the case for 2SA and 2SC. I do not believe there is a hard and fast rule, which remains true. 2SA versus 2SB categories are a general case. As can be observed, there is an ability to learn initial information about an EIAJ transistor just by looking at its prefix a rather ingenious numbering system. | |
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