2SK389 replacement

[Hyldal]

Do anyone know of another dualfet that can replace a 2SK389. It does not have to be the same package. I have looked at 2SK2145 and 2SK2145, SMD parts from Toshiba, but they semes also to be har d to find. Does anyone know are they also about to be obsolite?

 

[acid_k2]

A replacement for Toshiba's discontinued 2SK389 is available from Linear Integrated Systems.

Try finding LSK389

 

[Hyldal]

Thank you for the input. If others have a good dual fet to recommend, I would like to know. to have as many alternatives as possible.

 

[BrianL]

You do not have a whole lot of options. In general, discrete semiconductors, especially small-signal units, are decreasing in availability and variety. Small-signal FETs have always been a niche market and are are more so these days. Linear Systems seems to be surviving by re-creating defunct but unique-and-useful discretes, much like Oliver Q. Germanium did 20 years ago, and have picked up the 2SK389. Ten years ago there were not that many duals available, and there are even less today. Don't think you'll have a dozen different p/n's to choose from.

Be happy if you can purchase LSK389's for low-noise duals

 

[Roar Malmin]

Do you need many? I have them in GR, BL and V versions.

Roar

 

[Ryssen]

Try finding LSK389

There are samples..

 

[Roar Malmin]

2SK389/2SJ109

Sorry if I were unclear. I have original Toshiba 2SK389/2SJ109 in GR, BL and V versions.

 

[vmoreau]

Hello Roar Malmin,

I'm a newbie in this forum and would like to start a DIY project (diff preamp) based on Toshiba 2SK389/2SJ109 FET pairs.
I have found your post which is quite old... but I can't mail you for the moment (forum restriction for newbies).
Do you still have some 2SK389/2SJ109 to sell ? What would be the prices for each grade.
Thanks.
Hope to get some news soon !
Vincent

 

[t_blizzard]

Vishay has dual fets.
They can be found at:
http://www.vishay.com/fets-small-signal/SSFsgdnchjP/

 

[t_blizzard]

Thank you for the input. If others have a good dual fet to recommend, I would like to know. to have as many alternatives as possible.

Vishay offers dual fets like the U404 and U406.

 

[jacco vermeulen]

Cheez,
i thought you were going to post a link to an affordable vendor of U430/U431/U440/U441s

 

[janegood]

Sorry if I were unclear. I have original Toshiba 2SK389/2SJ109 in GR, BL and V versions.

Do you still have some in the V version?

 

[janegood]

Do you still have some in the V version?

Received 2SK389V from e-bay shop Electronics Salon.
8 VDC over Drain and Source with Gate not connected ==> 6-7 mA.

 

[janegood]

Received 2SK389V from e-bay shop Electronics Salon.
8 VDC over Drain and Source with Gate not connected ==> 6-7 mA.

10 VDC D-S, Gate connected to Source ==> 11,8 mA on the Chinese items, 11,3 mA on old stock from a Borbely project. Matching between the duals spot-on.

 

[reggieSf25]

would replacing dual fets with 2x single fets offer better performance in amplifer?

 

[tiefbassuebertr]

Vishay has dual fets.
They can be found at:
http://www.vishay.com/fets-small-signal/SSFsgdnchjP/

most of the listed types seems to be obsolete, therefore URL is dead - go to
Dual N-Ch JFETs
for listing from the year 2006