Electronics > Beginners
Recommended MOSFETs, JFETs
qu1j0t3:
I am playing around with a voltage follower and current amplifier circuit, and I noticed that I have almost no P-ch FETs.
Furthermore, just about all the JFETs available on Digikey are "switching" type, but I am more interested in amplifier type (Mouser seems to have more).
Does anyone have recommended P-ch (or N-ch) part numbers of either MOSFET or JFET type for follower/amplifier applications? Low voltage/low current in my case. I'd like to have a few of both N and P in stock for experiments.
(This question almost belongs on the "from no parts to stockpile" thread, but posting as a topic for better visibility…)
TIA & compliments of the season
Psi:
might be some ideas here
https://www.eevblog.com/forum/chat/jellybean-list/
T3sl4co1l:
JFETs aren't fundamentally different; they are selected based on testing. When you buy a, say, PN4392, you're buying a part that was tested to a switching spec, so it has so-and-so pinchoff voltage, Rds(on) and leakage.
You can infer the small-signal parameters from Vpo and Rds(on), if a bit sloppily.
A 2N5486 may not even have an Rds(on) rating, though it's pretty obvious what that value is from the curves. It will however carry the assurance of so-and-so transconductance, capacitance, Y parameters, whatever, that you need in the design of an RF amp/osc.
And some RF parts may carry a noise rating, but noise depends on frequency too; expect 1/f or popcorn noise at low frequencies (audio, LF). Conversely, low noise (LF) parts may be noisy at HF, though they're sometimes too big (e.g., J105) to use at high frequencies anyway so that's okay.
There are very few JFETs that you actually need/want, and this is reflected in the ever-shrinking market. They're great parts when you need them, it's just very rare that you do. :-\
Tim
oPossum:
If this is for audio / low frequency application, then... http://www.linearsystems.com/product.html
qu1j0t3:
--- Quote from: oPossum on December 27, 2018, 12:44:43 am ---If this is for audio / low frequency application, then... http://www.linearsystems.com/product.html
--- End quote ---
Yes, currently, but I'm also considering what to keep in stock for the future.
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