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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 17:55:10 -0400
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"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.

>
>