Path: ...!weretis.net!feeder9.news.weretis.net!usenet.blueworldhosting.com!diablo1.usenet.blueworldhosting.com!nnrp.usenet.blueworldhosting.com!.POSTED!not-for-mail From: "Edward Rawde" Newsgroups: sci.electronics.design Subject: Re: Fast monostable with a transistpor array Date: Fri, 14 Jun 2024 12:18:23 -0400 Organization: BWH Usenet Archive (https://usenet.blueworldhosting.com) Lines: 78 Message-ID: References: <8epo6jhf5k5nbkkqp5ot9b6nq1lhoia870@4ax.com> Injection-Date: Fri, 14 Jun 2024 16:18:24 -0000 (UTC) Injection-Info: nnrp.usenet.blueworldhosting.com; logging-data="69685"; mail-complaints-to="usenet@blueworldhosting.com" Cancel-Lock: sha1:qObOvCckZZU77Mi8ry1g7O6Xghk= sha256:n2Z/dmmrNORj7x3VFr6eGVWtRJlzjYUg3yZNMP4emeY= sha1:z/R9s73YcftjQ5Xv8u8TQ/wN8x4= sha256:yFzlF6rq1NR89CjvWbaSIEKtwQNIfQJVsrAusJcuiuA= X-Priority: 3 X-Newsreader: Microsoft Outlook Express 6.00.2900.5931 X-MSMail-Priority: Normal X-RFC2646: Format=Flowed; Original X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6157 Bytes: 4153 "john larkin" wrote in message news:8epo6jhf5k5nbkkqp5ot9b6nq1lhoia870@4ax.com... > On Fri, 14 Jun 2024 11:08:56 -0400, "Edward Rawde" > wrote: > >> >>"john larkin" wrote in message news:hilo6j9dgctalpiu4v09rpdavf6fetm1cv@4ax.com... >>> On Thu, 13 Jun 2024 23:25:37 -0400, "Edward Rawde" >>> wrote: >>> >>>>"Bill Sloman" 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? > > The duals save space, but aren't well matched so are electrically and > thermally equivalent to buying two separate parts. > > I wonder if one could design really fast stuff with the HFA3046. > Package parasitics look nasty. And the big package will force ugly PCB > routing. You can plop a single tiny transistor wherever you want. Yes that is certainly an advantage of single transistors. Is a suitable single transistor still available for use in new designs? > > The HFA parts are either 5 NPNs or 5 PNPs, which is also awkward. 3096 is three NPN two PNP > > > >>> >>> I do wish people would comment Spice sims properly, with author, date, >>> and what-the-hell-this-actually-is-supposed-to-do. >>> >>> >>> I wonder what happened to James. I think all the flaming here drove >>> him away. James was fun. He always skis in short pants. >>> >>>