On Sat, 28 Apr 2018 09:29:52 -0700, John Larkin
<jjlarkin@highlandtechnology.com> wrote:
[snip]
>
>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 http://www.analog-innovations.com | 1962 |
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
Reply by John Larkin●April 28, 20182018-04-28
On Sat, 28 Apr 2018 07:51:01 +0200, Gerhard Hoffmann
<gerhard@hoffmann-hochfrequenz.de> wrote:
>Am 28.04.2018 um 04:47 schrieb Jim Thompson:
>> On Fri, 27 Apr 2018 20:23:34 -0500, "Tim Williams"
>> <tiwill@seventransistorlabs.com> wrote:
>>
>>> How about a PAD1 model, any of those floating around? 2N4117?
>>>
>>> Tim
>>
>> I'll check that.
>>
>> The device in question is IF140... I typo'd :-(
>>
>> Maybe someone knows a cross to IF140?
>
>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
><
>https://www.flickr.com/photos/137684711@N07/37321004540/in/album-72157662535945536/
> >
>
>Hey, �55 a pop for the IF3602. :-(
>
>regards, Gerhard
>
>
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
Reply by John Larkin●April 28, 20182018-04-28
On Sat, 28 Apr 2018 07:34:46 +0200, Gerhard Hoffmann
<gerhard@hoffmann-hochfrequenz.de> wrote:
>Am 28.04.2018 um 06:40 schrieb John Larkin:
>
>> 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.
>>
>
>Did you use BFT25 or BFT25A ? The A-Version has twice the ft.
>
>cheers, 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
Reply by Gerhard Hoffmann●April 28, 20182018-04-28
Am 28.04.2018 um 04:47 schrieb Jim Thompson:
> On Fri, 27 Apr 2018 20:23:34 -0500, "Tim Williams"
> <tiwill@seventransistorlabs.com> wrote:
>
>> How about a PAD1 model, any of those floating around? 2N4117?
>>
>> Tim
>
> I'll check that.
>
> The device in question is IF140... I typo'd :-(
>
> Maybe someone knows a cross to IF140?
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
<
https://www.flickr.com/photos/137684711@N07/37321004540/in/album-72157662535945536/
>
Hey, €55 a pop for the IF3602. :-(
regards, Gerhard
Reply by Gerhard Hoffmann●April 28, 20182018-04-28
Am 28.04.2018 um 06:40 schrieb John Larkin:
> 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.
>
Did you use BFT25 or BFT25A ? The A-Version has twice the ft.
cheers, Gerhard
Reply by John Larkin●April 28, 20182018-04-28
On Fri, 27 Apr 2018 18:10:04 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:
>On Fri, 27 Apr 2018 17:30:19 -0700, John Larkin
><jjlarkin@highland_snip_technology.com> wrote:
>
>>On Fri, 27 Apr 2018 16:56:46 -0700, Jim Thompson
>><To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:
>>
>>>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
>>
>>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
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
>How about a PAD1 model, any of those floating around? 2N4117?
>
>Tim
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 http://www.analog-innovations.com | 1962 |
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
Reply by Tim Williams●April 27, 20182018-04-27
How about a PAD1 model, any of those floating around? 2N4117?
Tim
--
Seven Transistor Labs, LLC
Electrical Engineering Consultation and Contract Design
Website: https://www.seventransistorlabs.com/
"Jim Thompson" <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote in
message news:7di7edhuvcpfviia7bei9k0foa7jtqjbm1@4ax.com...
> On Fri, 27 Apr 2018 17:30:19 -0700, John Larkin
> <jjlarkin@highland_snip_technology.com> wrote:
>
>>On Fri, 27 Apr 2018 16:56:46 -0700, Jim Thompson
>><To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:
>>
>>>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
>>
>>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
> --
> | 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 http://www.analog-innovations.com | 1962 |
>
> 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
Reply by Jim Thompson●April 27, 20182018-04-27
On Fri, 27 Apr 2018 17:30:19 -0700, John Larkin
<jjlarkin@highland_snip_technology.com> wrote:
>On Fri, 27 Apr 2018 16:56:46 -0700, Jim Thompson
><To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:
>
>>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
>
>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
--
| 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 http://www.analog-innovations.com | 1962 |
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
Reply by John Larkin●April 27, 20182018-04-27
On Fri, 27 Apr 2018 16:56:46 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:
>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
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
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com