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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 12:59:37 -0700
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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.