Path: ...!Xl.tags.giganews.com!local-2.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail NNTP-Posting-Date: Fri, 14 Jun 2024 17:11:12 +0000 From: john larkin Newsgroups: sci.electronics.design Subject: Re: Fast monostable with a transistpor array Date: Fri, 14 Jun 2024 10:11:12 -0700 Message-ID: References: <8epo6jhf5k5nbkkqp5ot9b6nq1lhoia870@4ax.com> User-Agent: ForteAgent/8.00.32.1272 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 69 X-Trace: sv3-o7oL9dsR0otZLNBJKKn/FKoIIcqfSpPoarYmU6V8FFPsw2Vl5k0I5PeAFyzUvlpPupa6sznQ5/JgSYj!MTD1ChcWAcHeU3pV014eiTr6RWr5uBQTXWbNlG3hnbx/zMf2KpvUW64pzi5qU9lLz6jdl3TVeCqS!wfm9VA== X-Complaints-To: www.supernews.com/docs/abuse.html X-DMCA-Complaints-To: www.supernews.com/docs/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 4167 On Fri, 14 Jun 2024 12:44:33 -0400, "Edward Rawde" wrote: >"john larkin" wrote in message news:viro6jlt7h02ehbsq20em8uv5snn3736up@4ax.com... >> On Fri, 14 Jun 2024 12:18:23 -0400, "Edward Rawde" >> wrote: >> >>>"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? >> >> 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?