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From: Bitrex on 9 Feb 2010 19:46
Can anyone recommend an N channel TO-92 JFET that would be good for
signal switching in a battery powered application? The on resistance
isn't really critical, but the supply voltage and the signal amplitude
require that the pinchoff voltage always be less than -2 volts or so.
From: MooseFET on 9 Feb 2010 20:50
On Feb 9, 4:46 pm, Bitrex <bit...(a)de.lete.earthlink.net> wrote:
> Can anyone recommend an N channel TO-92 JFET that would be good for
> signal switching in a battery powered application?  The on resistance
> isn't really critical, but the supply voltage and the signal amplitude
> require that the pinchoff voltage always be less than -2 volts or so.

The low pinch off suggests that you really would want one listed as a
low noise one not as a switching one. Switching ones are usually
optimized
more for the RDS issue.

IF1331 from interfet
From: John Larkin on 9 Feb 2010 21:42
On Tue, 09 Feb 2010 19:46:38 -0500, Bitrex
<bitrex(a)de.lete.earthlink.net> wrote:

>Can anyone recommend an N channel TO-92 JFET that would be good for
>signal switching in a battery powered application? The on resistance
>isn't really critical, but the supply voltage and the signal amplitude
>require that the pinchoff voltage always be less than -2 volts or so.

No chance of using an integrated CMOS analog switch?

John

From: Bitrex on 9 Feb 2010 23:44
John Larkin wrote:
> On Tue, 09 Feb 2010 19:46:38 -0500, Bitrex
> <bitrex(a)de.lete.earthlink.net> wrote:
>
>> Can anyone recommend an N channel TO-92 JFET that would be good for
>> signal switching in a battery powered application? The on resistance
>> isn't really critical, but the supply voltage and the signal amplitude
>> require that the pinchoff voltage always be less than -2 volts or so.
>
> No chance of using an integrated CMOS analog switch?
>
> John
>

I only need one switch, and as a hobbyist doing a prototype on
breadboard I was hoping to use through-hole components. All the single
switch CMOS ICs I've seen have been in surface-mount packages. I
suppose if I have to I can overcome the aesthetic objections of using
something like a 4066 for this application.
From: John Larkin on 10 Feb 2010 00:21
On Tue, 09 Feb 2010 23:44:20 -0500, Bitrex
<bitrex(a)de.lete.earthlink.net> wrote:

>John Larkin wrote:
>> On Tue, 09 Feb 2010 19:46:38 -0500, Bitrex
>> <bitrex(a)de.lete.earthlink.net> wrote:
>>
>>> Can anyone recommend an N channel TO-92 JFET that would be good for
>>> signal switching in a battery powered application? The on resistance
>>> isn't really critical, but the supply voltage and the signal amplitude
>>> require that the pinchoff voltage always be less than -2 volts or so.
>>
>> No chance of using an integrated CMOS analog switch?
>>
>> John
>>
>
>I only need one switch, and as a hobbyist doing a prototype on
>breadboard I was hoping to use through-hole components. All the single
>switch CMOS ICs I've seen have been in surface-mount packages. I
>suppose if I have to I can overcome the aesthetic objections of using
>something like a 4066 for this application.

There are some cute, cheap single-gate CMOS switches, but they're
SOT-23s or smaller.

John

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