Semiconductor markings

[Richard]

I have a transistor marked D401-Y, made by SEC.

I see data sheets marked CSD401, 2SDS401, KSD401, MPD401.

I think it's clear that the device is essentially an NPN Power Transistor.

But why the diffrent prefixes CS, 2S, KS? Are these particular manufacturers
markings?

I think the Y is some kind of suffix. Thanks.

http://www.alldatasheet.com/view.jsp?Searchword=D401

 

[Phil Allison]

"Richard"

I have a transistor marked D401-Y, made by SEC.

I see data sheets marked CSD401, 2SDS401, KSD401, MPD401.

I think it's clear that the device is essentially an NPN Power Transistor.

But why the diffrent prefixes CS, 2S, KS? Are these particular
manufacturers markings?

** The " 2S " prefix comes from the original EIAJ ( Electronics Industry
Association of Japan ) standards for numbering transistors. This
organisation is no longer operating and has been replaced by JETIA.

" KS " prefixed part numbers often mimic the EIAJ ones, but are made in
Korea and not entitled to use the EIAJ numbers.

At a guess, " CS " prefixed devices are made in China.

Often, the above prefixes are not printed on the packages of the device,
purely to save space AFAIK.

I think the Y is some kind of suffix.

** The Y suffix indicates the device's Hfe ( ie beta) falls in the range 120
to 240.

This info is on the data sheet for the 2SD401.


...... Phil