roland fet

[Osamu Hoshuyama]

Hello list members,

> Date:    Mon, 10 Apr 2000 20:07:00 +0200
> From:    "jhaible" <jhaible at debitel.net>
> > Not so much of colour but the letter is written on the side of the can.
> > The parameter that determines grade is the Vp, or pinch off voltage. In
> > a FET follower circuit, this will affect offset of the output in
> > comparison to the input voltage. GR is the worst, highest. O is the
> > lowest that you can get hold of, but there is one lower. Y is the
> > standard one it seems. There is an overlap between the grades. I have
> > tested some O types to be worse than Y types.
> 
> This is interesting. I knew they were sorted in threshold groups, but
> not which one was which letter.

2SK30 (and 2SK30ATM) is classified by Idss not Vp.

R: Idss = 0.30--0.75mA (Vp = -0.5--0.7V)
O: Idss = 0.60--1.40mA (Vp = -0.6--1.2V)
Y: Idss = 1.20--3.00mA (Vp = -1.1--1.9V)
GR: Idss = 2.60--6.50mA (Vp = -1.7--2.9V)

Vp's are roughly calculated by me based on the datasheet of 2SK30ATM.
(http://www.semicon.toshiba.co.jp/noseek/us/td/12frame.htm)

"GR", "Y", and "O" are still common FETs in Japan. "O" may be a little
bit difficult to find.  "R" is rare even in Japanese diy shops.

- -- ---- ----------- --- --- - ----- -- --- --- - - ------ - - - --
 Osamu HOSHUYAMA          Digital Signal Processing Technology Group
                    C&C Media Research Laboratories, NEC Corporation
               Email: houshu at ccm.CL.nec.co.jp,  Fax: +81-44-856-2232
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