Anyone Have Spice model for JFET IF400?
It's only used as a diode in the discrete circuit I have been asked to model behaviorally, but it's the only model I haven't been able to find :-( ...Jim Thompson
-- | James E.Thompson | mens | | Analog Innovations | et |
Sorry! TYPO. Should be IF140 :-( ...Jim Thompson
-- | James E.Thompson | mens | | Analog Innovations | et |
Jfets are terrible diodes. Lots of capacitance and lots of series resistance, and enormous (like, 1 pA) reverse leakage.
-- John Larkin Highland Technology, Inc picosecond timing precision measurement
That reverse leakage is what I think they are using them for. ...Jim Thompson
-- | James E.Thompson | mens | | Analog Innovations | et |
How about a PAD1 model, any of those floating around? 2N4117?
Tim
-- Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design
I'll check that.
The device in question is IF140... I typo'd :-(
Maybe someone knows a cross to IF140? ...Jim Thompson
-- | James E.Thompson | mens | | Analog Innovations | et |
The c-b junction of a BFT25 is a far superior diode. Below 10 fA by my measurements. Capacitance is something like 0.3 pF.
-- John Larkin Highland Technology, Inc lunatic fringe electronics
Am 28.04.2018 um 06:40 schrieb John Larkin:
Did you use BFT25 or BFT25A ? The A-Version has twice the ft.
cheers, Gerhard
Am 28.04.2018 um 04:47 schrieb Jim Thompson:
I find the "data sheet" quite offensive. Half a page of barn-door wide specs in HTML, not even a .pdf document that you could take as a reference. (as followed from the Mouser link.)
For a comparison of 8 IF3602 (probably more uniform than 16 IF3601) see <
Hey, ?55 a pop for the IF3602. :-(
regards, Gerhard
I used the NXP A version.
I always thought, for some reason, that RF parts should be leaky. But that's not so.
It's hard to measure 10 fA.
-- John Larkin Highland Technology, Inc lunatic fringe electronics
The IF140 is $11.58 each at Mouser. That's an outrageous price for a mediocre diode.
BFT25A is 63 cents at Q1, 20 cents in quantity.
Sounds like Jim's customer needs circuit design consulting, not device modeling. Goodness knows what other silly stuff they are doing.
-- John Larkin Highland Technology, Inc lunatic fringe electronics
No comment, besides displaying an SEG >:-} ...Jim Thompson
-- | James E.Thompson | mens | | Analog Innovations | et |
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