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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 10:11:12 -0700
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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?