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2SK30 that are not real 2SK30?

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I ordered 2SK30A-Y from Supremetronic in Toronto a few years ago. Last time I checked the stock list, it was still there, but you should inquire by email since the website is being changed and not all of the catalog is currently online. These had the standard pinout and proved to be pretty closely matched, Vgs(off) = 1.5V+/-0.1 volt when I tested 25 of them. I believe the transistor is still in production as the 2SK30ATM-Y...

Gilles C:
I checked on their site before I ordered from Electronix, but as I didn't find anything on their new website, I decided to order from Electronix in place of sending Supremetronics an email.

Maybe I should have. I'll see.

I wanted some fast, so I also bought some locally, and these are the ones with the wrong pinout.

I will use them anyway, but I really want some with the correct pinout so I can test some layouts with that pinout.

I have only one week left before I go to a training out of town for 5 weeks (Montreal), so ordering some more right wouldn't be  a good move.


I wondered at this confusion.
Cause I'm a Japanese and have familiarity in a Japanese products (ex..semiconductors)
I've found schematics from US, "Ahh, is 2N5088 substitute 2SC945?" :cry:
...Always asking Google and found PDF of datasheets.

The following is small preparations and you'll not need to repeat.
Check it out, make a note, and you'll find good substitute :D

Well,,, in Japan, "2SK30A" is a most common and very popular.
for low-frequency use, especially audio-use.
And of cource, not VINTAGE/NOS, and not so expensive.
Click on datasheet search, You can find datasheet of TOSHIBA.

Its current part-number is 2SK30ATM. perfect substitute of "2SK30A"
TOSHIBA only carried out the minor change.
There is 2SK30ATM in a market actually.

AMS is just a seller, not a manufacture company.

The minor change of "30A"was carried out in this way.
You'll notice the versions since 1970s.

Tons of data lists of Japanese transistor/FET also containing old things.
The upper is bipolars, lower is FETs.

2SK is J-FET or MOS-FET.
the digits following "2SK"shows original part-number for every manufucture.

Japanese(or OEM) Bipolar-transisiter...
2SA PNP generally high-freq use, low-freq OK
2SB PNP low-freq
2SC NPN generally high-freq use, low-freq OK
2SD NPN low-freq

In the case of TOSHIBA,
The alphabet added to the end expresses an Idss ranking.
You can specify it certainly.

See PDF of 2SK30ATM...

 R: 0.30-0.75,
 O: 0.60-1.40,
 Y: 1.20-3.00,
 GR: 2.60-6.50 [mA]

...Have you noticed that it is initials of a row like color-code?

2SK30A-O or -Y was often used by BOSS in 1970-80s.

In Bipolar,
that alphbet expresses hFE ranking.

Gilles C:
Hey, Thanks a lot for the help and info.

About the code letters, it looks like colors indeed ... GR for GRey, etc...

But I never saw any other specs sheet other that the one for Toshiba and that was for the 2SK30ATM.

I'll check your infos a bit more later tonight.

I checked the 2 different 2SK30s I have and the one with the correct pin-out has the letters "ma" after the 2SK30A number.

The ones with the incorrect pin-out has a "68".

Must be to identify the company.


hi, again.  :o

I think that you may mistake about pinout problem.

but I don't know your concrete application.

for example, switch-use J-FET,
It is satisfactory even if it replaces D and S.

In others,
It may mistake because of blurred printing.
3 & 8, B & R....

These are common mistake.
Although I do not suspect you :?

GR must be GReen. so, BL is BLue...
for example >>>2SC1815-BL


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