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| Max Vgs on J211 Datasheet |
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| eev_carl:
Hi, I was wondering what the Max VGs(off) = -4.5V value in the J211 datasheet is. I'm getting 0uA when I go to the Min VGs(off) cutoff of -2.5V and didn't see any change when I moved VGs lower (more negative). I have a 220 ohm resistor at the drain of a test VCR circuit. Datasheet: https://www.mouser.com/datasheet/2/308/J211-1120841.pdf Thanks, Carl |
| fourtytwo42:
Its the range of cutoff voltage across a selection of devices, you will never need more than -4.5V to get cutoff but some will cutoff as low as -2.5V :) |
| eev_carl:
Does that mean that there are some J211's out there that won't cutoff at -2.5V (all 3 that I tried cut off at -2.5V)? Is the difference in packaging? The datasheet has an MMBF packaging for a surface mounted device that I didn't try. |
| fourtytwo42:
I think it just to allow them latitude for process variations so you should design your circuit to be abe to operate across the full range unless you want to follow a select on test procedure (can be expensive). As you can see they do not state a typical! |
| Kleinstein:
The cut off voltage with JFETs shows quite a lot of scattering between units. When you buy a few from the same batch, chances are they are a little closer together, but next batch can be quite different. The difference is not from the package, but from making the silicon chip. |
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