2sk208-Y vs 2sk208-R Low Tide

[Kroars]

Seeing as it may be a wait until we see 2sk208-Y’s back in stock, Mouser has 2sk208-R’s available now. Looks like R is rated at 30mA-70mA and Y is rated at 1.2mA-3mA. Assuming this is concerning the circuits draw (which this one is around 35mA) would the 2sk208-R be an appropriate substitute, maybe a bit closer in kind than a J201?

Thanks for any input!

https://www.mouser.com/datasheet/2/408/2SK208_datasheet_en_20140301-1272543.pdf

 

[temol]

Looks like R is rated at 30mA-70mA

Not 30 mA to 70mA but 0.3mA to 0.7mA. This is one of the parameters that characterizes JFET transistors - Idss. And you cannot use it in relation to the current draw of the circuit.
Low Idss and Vp values put R version close to MMBFJ201. Most 2SK208R I've measured had very low spread of the Idss and Vp, lower than MMBFJ201.

 

[bowanderror]

This calls for the 2SK208-Y, but you can probably get away with a 2SK208-GR (higher Idss) - I also saw someone in another thread using the -GR variant. The -R is 2 Idss bins lower than the -Y, so I wouldn't recommend it. I'd use the J201.

Another option is the 2SK30ATM-Y, which has the same Vp & Idss, but a different pinout (so you'll have to rearrange them on the board). I used this and it works great.

 

[danfrank]

I used a 2SK30A-GR (low end on the GR scale) also and it worked fine. You could also use a 2SK246-Y and it would work fine.

 

[Diynot]

This calls for the 2SK208-Y, but you can probably get away with a 2SK208-GR (higher Idss) - I also saw someone in another thread using the -GR variant. The -R is 2 Idss bins lower than the -Y, so I wouldn't recommend it. I'd use the J201.

Another option is the 2SK30ATM-Y, which has the same Vp & Idss, but a different pinout (so you'll have to rearrange them on the board). I used this and it works great.

On the same quest, but did I read that right, that I can sub a J201 for the 2sk208-y?

 

[Kroars]

On the same quest, but did I read that right, that I can sub a J201 for the 2sk208-y?

Yup

 

[Many__Of__Horror]

I used SMD J201s and they worked without issue

 

[Matopotato]

I am trying to figure out the pinout od 2SK208-GR as I have 2 versions of adapters. I read the S and D are interchangeable, and yet I had an older build where it seemed to matter.
So I get to Toshiba datasheet from varous sources but cannot tell if the drawing is from above or below.
I checked the schematic and pcb to find which pins correspond to 1 2 and 3 in the schematic.
How to determine which is which?
Datasheet

https://www.mouser.com/datasheet/2/408/2SK208_datasheet_en_20140301-1272543.pdf

Build doc

https://docs.pedalpcb.com/project/LowTide-PedalPCB.pdf

On first page of duild doc, the pcb, the pins are 3,2,1 left to right for Q1 with 2, 3, 1 top to bottom for its smd.
1 goes to the R4 in schematic and 2 down to R3.