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From: "Edward Rawde" <invalid@invalid.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Fast monostable with a transistpor array
Date: Fri, 14 Jun 2024 15:19:08 -0400
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"john larkin" <jl@650pot.com> wrote in message news:m7uo6jhfuobfcjaps5o6hatlnm6ntnv84m@4ax.com...
> On Fri, 14 Jun 2024 12:44:33 -0400, "Edward Rawde"
> <invalid@invalid.invalid> wrote:
>
>>"john larkin" <jl@650pot.com> wrote in message news:viro6jlt7h02ehbsq20em8uv5snn3736up@4ax.com...
>>> On Fri, 14 Jun 2024 12:18:23 -0400, "Edward Rawde"
>>> <invalid@invalid.invalid> wrote:
>>>
>>>>"john larkin" <jl@650pot.com> wrote in message news:8epo6jhf5k5nbkkqp5ot9b6nq1lhoia870@4ax.com...
>>>>> On Fri, 14 Jun 2024 11:08:56 -0400, "Edward Rawde"
>>>>> <invalid@invalid.invalid> wrote:
>>>>>
>>>>>>
>>>>>>"john larkin" <jl@650pot.com> wrote in message news:hilo6j9dgctalpiu4v09rpdavf6fetm1cv@4ax.com...
>>>>>>> On Thu, 13 Jun 2024 23:25:37 -0400, "Edward Rawde"
>>>>>>> <invalid@invalid.invalid> wrote:
>>>>>>>
>>>>>>>>"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:v4f2nm$2augj$1@dont-email.me...
>>>>>>>>> One option John Larjkin doesn't seem to have explored is using Renesas HFA3096 five transistor array as basis for his
>>>>>>>>> mononstable
>>>>>>>>> and level shifter.
>>>>>>>>>
>>>>>>>>> It offers three 8GHz NPN parts and two 5.5GHz PNP parts in a single array.
>>>>>>>>>
>>>>>>>>> https://www.renesas.com/us/en/document/dst/hfa3046-hfa3096-hfa3127-hfa3128-datasheet?r=494216
>>>>>>>>>
>>>>>>>>
>>>>>>>>I put the NPN model parameters into a circuit designed by yourself.
>>>>>>>>It's late now but I got as far as Time step too small.
>>>>>>>>
>>>>>>>
>>>>>>> That is neither fast nor a monostable.
>>>>>>
>>>>>>Yes ok it's an astable and certainly not intended to be fast.
>>>>>>It was intended only to see if the model worked. Nothing more.
>>>>>
>>>>> It doesn't work!
>>>>>
>>>>>>
>>>>>>>
>>>>>>> There's no reason to use many-GHz parts in micropower circuits. One
>>>>>>> reason is that the sim breaks.
>>>>>
>>>>> Most versions of the HFA3046 are obsolete. The only one left at
>>>>> Digikey costs $12. It would be risky to design around that part.
>>>>
>>>>If it's obsolete or going obsolete then yes it would make no sense to use it.
>>>>I would guess that you get to do plenty of work because a manufacturer has suddenly decided to discontinue a part.
>>>>
>>>>> Wasn't  HFA originally a Harris part?
>>>>>
>>>>> There are lots of dual (non-monolithic) diodes and bipolars and fets
>>>>> around, but the monolithic arrays are mostly gone.
>>>>
>>>>What part would you recommend (single or dual) and does it have a working LTSpice model?
>>>
>>> Just pull up some parts from the standard library, some low current
>>> NPNs like BC547 maybe. Look for low capacitances if you care about
>>> that; the HFAs are good in that respect.
>>
>>Yes but BC547 sounds almost as ancient as BC107
>>Are they still in production?
>
> It was just an example of a library part, but Digikey will sell you a
> million pieces.
>
>>What would work well at a GHz or two or more?
>
> For switching? Tuned RF?

I meant a specific npn part and maybe also pnp which is not going obsolete.

>