Anyone Have Spice model for JFET IF400?

Sorry! TYPO. Should be IF140 :-( ...Jim Thompson

-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | STV, Queen Creek, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

Thinking outside the box... producing elegant solutions, by understanding what nature is hiding.

"It is not in doing what you like, but in liking what you do that is the secret of happiness." -James Barrie

Jfets are terrible diodes. Lots of capacitance and lots of series resistance, and enormous (like, 1 pA) reverse leakage.

That reverse leakage is what I think they are using them for. ...Jim Thompson

How about a PAD1 model, any of those floating around? 2N4117?

Tim

-- Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design Website:

"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...

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 | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | STV, Queen Creek, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

Thinking outside the box... producing elegant solutions, by understanding what nature is hiding.

"It is not in doing what you like, but in liking what you do that is the secret of happiness." -James Barrie

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.

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.

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.

No comment, besides displaying an SEG >:-} ...Jim Thompson

-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | STV, Queen Creek, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

Thinking outside the box... producing elegant solutions, by understanding what nature is hiding.

"It is not in doing what you like, but in liking what you do that is the secret of happiness." -James Barrie