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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 16:17:18 -0700
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On Fri, 14 Jun 2024 17:55:10 -0400, "Edward Rawde"
<invalid@invalid.invalid> wrote:

>"john larkin" <jl@650pot.com> wrote in message news:778p6jli5d9ba92cag0pl4pcsl22qphm2s@4ax.com...
>> On Fri, 14 Jun 2024 15:50:31 -0400, "Edward Rawde"
>> <invalid@invalid.invalid> wrote:
>>
>>>"piglet" <erichpwagner@hotmail.com> wrote in message news:v4i0ev$304v8$1@dont-email.me...
>>>> On 14/06/2024 17:03, john larkin wrote:
>>>>> 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!
>>>>>
>>>>
>>>> Yeah, there is something very wrong with that transistor model.
>>>>
>>>> Here is an emitter coupled multivib that can run fast. Should be possible somehow to gate it into being a monostable - worst 
>>>> case
>>>> wrap a latch around it so it runs just one pulse?
>>>>
>>>
>>>Now we're getting somewhere. Thanks piglet. 2SC3838K typical ft 3.2 GHz and available.
>>>However it's not recommended for new designs if you believe the rohm site.
>>>So I wonder if it has a successor which is available.
>>>
>>>NSVF6001SB6T1G looks interesting but no sign of a model other than symbol, footprint and 3D that I can find.
>>>
>>
>> I like BFS17. It's fast, but not so fast as to get cranky. It
>> generally behaves.
>
>But looks like it's going obsolete. 55GN01FA is on the list of alternatives.
>
>>
>> 
>

Digikey shows two active sources. My inventory program shows MMBTH10
as an alternate.

Mouser has a million BFS17s in stock.

1 GHz is a nice speed for lots of things.