Modern general purpose audio JFETs

[John B]

I'm starting to run low on my old bags of TO-92 JFETs that I used for general audio. Stuff like PN4416, 2N5457, along with other numbers PN4393 and 2N5486 that I ran out of long ago.

I think they are all obsolete now. I was looking around on LCSC.com to see what they have. As an aside note, JFETs are listed as MOSFETs, making the search harder.

Am I right in thinking that the modern equivalents in SMD packages are:

PN4416 -> MMBF4416
2N5457 -> MMBF5457

I also had a look on Digikey Aus to see what they have. None of those regular ones are listed, but at least they have a catalogued list of JFETs.

But now seems like a good time to see what others are using for general purpose audio JFETs. Sometimes I use them for their linear qualities, sometimes just as switches.

[jlmoon]

2n7000 / 2n7001  are cheap and work well for low power stuff.  Make great switches too!

[jwm_]

2n7000 / 2n7001  are cheap and work well for low power stuff.  Make great switches too!

Those are MOSFETs, not JFETs.

[Calvin]

Hi,

the 4391 to 4393 should still be active from ONSemi.
Then there are the lownoise Toshiba-clones LSKxxx form Linear Systems.
A newer lownoise device could be the 2SK3547.

regards
Calvin

[SiliconWizard]

Am I right in thinking that the modern equivalents in SMD packages are:

PN4416 -> MMBF4416
2N5457 -> MMBF5457

Well, compare datasheets. The 2N5457 and MMBF5457 share the same datasheet (obviously with different power dissipation figures). Eg:
https://www.onsemi.com/PowerSolutions/product.do?id=MMBF5457

PN4416 and MMBF4416 seem to have slightly different characteristics from what I found but again datasheets will help.

I've personally used the MMBF4393 with no noticeable difference compared to 2N4393, same with SST201 instead of J201.

[John B]

Press F to pay respects to the 4416 JFET.

[profdc9]

There appears to be Central Semiconductor parts.  I have used the 2n5486 in RF projects, but it appears to have low noise figure at low frequency (1.5 dB or so):

https://www.mouser.com/Search/Refine?Keyword=2n5486

Also makes a 2N5457 replacement

https://www.mouser.com/ProductDetail/Central-Semiconductor/2N5457-BK-PBFREE/?qs=OlC7AqGiEDlzXz7ZBahsRQ%3D%3D

Kind of expensive but still available.

[Zero999]

The 2SK2394 looks decent for low noise applications.
https://docs.rs-online.com/8558/0900766b8127c95a.pdf