Japanese code of components

[Alex [Temple-Heath List]]

At 06:54 AM 9/7/2006, you wrote:
>I have to change them including same types NPN or PNP
>
>     1 transistor with the inscription 
> :           D571               NPN or PNP type ?
>
>     1 transistor with the inscription 
> :          C945                  NPN or PNP type ?
>
>     1 transistor with the inscription :          C1400/E944    NPN 
> or PNP type ?


It has been my understanding that the japanese transistors are in 
general cataloged as follows:

A: PNP small signal (ex: 2SA708, or A708)

B: PNP power (ex: 2SB925, or B925)

C: NPN small signal (ex 2SC945, or C945)

D: NPN power (ex: 2SD313, or D313

Still, there seem to be variations on the power versus letter, for 
example sometimes you see a "A" transistor in a TO-220 case, like the 
A913, so the power rating should only be used as a general reference.

Hope that helps.
-Alex  

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