Frank,

Thanks, I could buy those but the truth is that in my country we have to pay more than 100% taxes. One single FET would cost more than a whole minimum wage of salary around here. So I try to avoid importing as much as possible, but it is a possibility if I don't?find a more widely available part. Thank you for pointing me to that ad.

Vladan,

That's really valuable info. Where did you get that from? I've been googling for days and found nothing. I have been looking at a NS 2N3958 datasheet and am wondering if that would do the job. Gfs is at least double the minimum you listed, and Ciss is typically around 3.5pF, but the rest seems ok. Considering these are select parts, what exactly?did HP select them for? I'm asking because you seem to have much more information?than I ever managed to find after many days on google.?

On Wed, Jun 2, 2021 at 9:57 PM pianovt via <pianovt=[email protected]> wrote:

This is a selected part, which means that something similar was widely available, but I can't give you any commercial part numbers. Here is what I have:

National Semiconductor SF83025 or Intersil ITS31087. These are custom numbers, don't bother looking for them in old catalogs. However, see if you can find something similar to the specs below in NS and Intersil books.:

BVgss 40V min
IDss?? 0.5mA min, 5mA max.
Gfs? 0.5mS min.
Vp/Vgs (threshold)? 0.5V min, 4V max
Ciss? 2pF
Vgs match? 10mV
300mW max

These are almost certainly made with two die per package.

Vladan

--

Regence Audio Valvulados
bernardo@...

Tam,?

Thank you very much for your kind offer, I will let you know if I need something, that's very kind of you to offer.

Joarez,

Can you share your e-mail?so I can contact you directly? I'm not sourcing these fets from Multcomercial, but I am afraid that the guy might be selling the same parts with a premium price. Do you have any experience with these? Are these fake?

On Thu, Jun 3, 2021 at 5:15 PM joarez siczkoriz via <jsiczkoriz=[email protected]> wrote:

Hi ,

After several repairs in the line of HP instruments, mainly in HP8903 units, I recommend that the SF83025 be used, compared to the 2N3958 if they are bought in Brazil, mainly in Multicomercial, I'm sorry to say that I'll throw your money in the Trash

Thanks a lot 

Joarez Siczkoriz 

Em quinta-feira, 3 de junho de 2021 12:05:58 BRT, Tam Hanna <tamhan@...> escreveu:

Hello,

I can always order a FET for you with my next Mouser order, and stuff it in an untracked letter.

Tam

- - - - -
With best regards
Tam HANNA 

Enjoy electronics? Join 13500 followers by visiting the Crazy Electronics Lab at 

On 03.06.21 03:18, Bernardo Santos wrote:

Frank,

Thanks, I could buy those but the truth is that in my country we have to pay more than 100% taxes. One single FET would cost more than a whole minimum wage of salary around here. So I try to avoid importing as much as possible, but it is a possibility if I don't?find a more widely available part. Thank you for pointing me to that ad.

Vladan,

That's really valuable info. Where did you get that from? I've been googling for days and found nothing. I have been looking at a NS 2N3958 datasheet and am wondering if that would do the job. Gfs is at least double the minimum you listed, and Ciss is typically around 3.5pF, but the rest seems ok. Considering these are select parts, what exactly?did HP select them for? I'm asking because you seem to have much more information?than I ever managed to find after many days on google.?

On Wed, Jun 2, 2021 at 9:57 PM pianovt via <pianovt=[email protected]> wrote:

This is a selected part, which means that something similar was widely available, but I can't give you any commercial part numbers. Here is what I have:

National Semiconductor SF83025 or Intersil ITS31087. These are custom numbers, don't bother looking for them in old catalogs. However, see if you can find something similar to the specs below in NS and Intersil books.:

BVgss 40V min
IDss?? 0.5mA min, 5mA max.
Gfs? 0.5mS min.
Vp/Vgs (threshold)? 0.5V min, 4V max
Ciss? 2pF
Vgs match? 10mV
300mW max

These are almost certainly made with two die per package.

Vladan

--

Regence Audio Valvulados
bernardo@...

--

Regence Audio Valvulados
bernardo@...