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From: john larkin <jl@650pot.com>
Newsgroups: sci.electronics.design
Subject: Re: Fast monostable with a transistpor array
Date: Fri, 14 Jun 2024 12:57:17 -0700
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On Fri, 14 Jun 2024 15:19:08 -0400, "Edward Rawde"
<invalid@invalid.invalid> wrote:

>"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.
>
>> 
>

You can search Mouser or Digikey for a multi-sourced part.

Sadly, fast PNPs are mostly going EOL, faster than NPNs. And all the
good things, like GaN and SiC and phemts, are n-types. Nature must
dislike P-things.

Designing with disctetes is educational, but nowadays ICs are the
practical winners. Like wideband MMICs for 10 cents, opamps and
switching regulators for 15.

Gotta move up the abstraction stack.