[Test-Equipment] Transistor part numbers

[Glenn Little WB4UIV]

In the US standard (JEDEC) numbered semiconductors are marked with a the 
number of junctions followed by an 'N' (do not know why) and then a 
sequential registration number. Diodes (one junction) are marked 1Nxxx. Two 
junction devices (SCR, bipolar transistors and the like) are marked 2Nxxx. 
Three junction devices (MOSFETS) are marked 3Nxxx. Four junction devices 
(opticouplers) are marked 4Nxx.

Japan uses a system where the N is replaced by an S and usually another 
letter. The other letter tells additional information about the device.

Hope this helps a little

Happy new year
73
Glenn
WB4UIV

At 02:03 PM 01/02/06, Rasputin Novgorod wrote:

>I notice that transistor part numbers frequently start
>with 2N, eg: 2N3055. So, why don't PNP transistors start
>with 2P?
>
>Sincerely
>/b
>
>
>
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