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Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: Cursitor Doom <cd999666@notformail.com> Newsgroups: sci.electronics.design Subject: Re: MOSFET varieties Date: Wed, 8 Jan 2025 23:55:06 -0000 (UTC) Organization: A noiseless patient Spider Lines: 62 Message-ID: <vln38q$30btn$1@dont-email.me> References: <vljglc$28m4h$2@dont-email.me> <lpkqnjphonfhbcvbfse81d6v0ttbcf2rj1@4ax.com> <vljtil$2b9pa$1@dont-email.me> <8jvqnj58kt2vrr9kgljolg8gviqee5virl@4ax.com> <vlkf13$2elni$1@dont-email.me> <vlmeip$2t2dv$2@dont-email.me> <lagtnj9auqvv4eateq4m82v447gmi2420d@4ax.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Injection-Date: Thu, 09 Jan 2025 00:55:11 +0100 (CET) Injection-Info: dont-email.me; posting-host="80b78dafa59e852f323b5d9b54876e99"; logging-data="3157943"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+QhdWr3mw7NnL1qMqlOVbE0IlQ7CWeG5U=" User-Agent: Pan/0.149 (Bellevue; 4c157ba) Cancel-Lock: sha1:cWxJWZPUslq0aO3+stOZNoTtTiQ= Bytes: 3337 On Wed, 08 Jan 2025 10:18:47 -0800, john larkin wrote: > On Wed, 8 Jan 2025 18:02:02 -0000 (UTC), Cursitor Doom > <cd999666@notformail.com> wrote: > >>On Tue, 7 Jan 2025 23:57:23 -0000 (UTC), Phil Hobbs wrote: >> >>> john larkin <jl@glen--canyon.com> wrote: >>>> On Tue, 7 Jan 2025 18:59:33 -0000 (UTC), Cursitor Doom >>>> <cd999666@notformail.com> wrote: >>>> >>>>> On Tue, 07 Jan 2025 08:22:37 -0800, john larkin wrote: >>>>> >>>>>> On Tue, 7 Jan 2025 15:19:08 -0000 (UTC), Cursitor Doom >>>>>> <cd999666@notformail.com> wrote: >>>>>> >>>>>>> Gentlemen, >>>>>>> >>>>>>> Is there a type of MOSFET which is normally 'on' with zero or low >>>>>>> positive gate voltage wrt source, but turns 'off' when Vgs is >>>>>>> increased to a higher positive 'threshold' value? >>>>>>> >>>>>>> CD >>>>>> >>>>>> A p-channel JFET would do that. >>>>>> >>>>>> Supertex makes some great depletion-mode NFETS, and someone else >>>>>> has equivalents. They make nice constant-current loads and current >>>>>> limiters. >>>>>> >>>>>> What are you trying to do? >>>>> >>>>> Thanks, John, but I don't want to start another lengthy thread here >>>>> which would no doubt happen if I explained - and everyone chipping >>>>> in a different idea so I end up losing track. So - no comment! :) >>>> >>>> Well, OK. I like to post problems here to brainstorm possibilities. >>>> Even silly ideas help me think about possibilities. >>>> >>>> But one can get lost-in-space too. Confusion is good, but not >>>> forever. >>>> >>>> Depletion fets are great fun. I like to discharge power supply caps >>>> with a depletion fet and an LED. It discharges linearly and winks out >>>> at 2 or 3 volts. >>>> >>>> >>>> >>> BTW I discover that there are 1700V SiC JFETs, such as the Qorvo >>> UF3N170400B7S. >>> >>> Cheers >>> >>> Phil Hobbs >> >>That is truly impressive. I'll have to look the price up now, just out >>of curiosity. > > Ixys, now Littlefuse, makes a 4700 volt mosfet. It's about $100. Wow! I am just so out of touch with what's available today. Fortunately, since I'm not a designer, I can afford to be. :)