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Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: John R Walliker <jrwalliker@gmail.com> Newsgroups: sci.electronics.design Subject: Re: Cap C-V test Date: Sun, 4 May 2025 15:11:26 +0100 Organization: A noiseless patient Spider Lines: 29 Message-ID: <vv7sie$1epp4$1@dont-email.me> References: <sik71k9uvbqacp964bvlc5317ga12gu9al@4ax.com> <vv6bc3$lohn$1@dont-email.me> <loid1kl3cb3c0m0hi5dvno24q5vk545gof@4ax.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Sun, 04 May 2025 16:11:27 +0200 (CEST) Injection-Info: dont-email.me; posting-host="908031b3c195349a05358289dd02a955"; logging-data="1533732"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19nTIXTTAWLXNML+jNq4KFm0W15u8hvCKU=" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:8ytnawebiBLjXzwBM6G4cmLG0e8= In-Reply-To: <loid1kl3cb3c0m0hi5dvno24q5vk545gof@4ax.com> Content-Language: en-US On 04/05/2025 03:17, john larkin wrote: > On Sun, 4 May 2025 02:11:47 +0200, Lasse Langwadt <llc@fonz.dk> wrote: > >> On 5/1/25 22:09, john larkin wrote: >>> >>> https://www.dropbox.com/scl/fi/a7425c69k3w8wx8tqjpq5/X110_CV_Test.jpg?rlkey=pc3c0b12ncswv6ajrn148stdk&raw=1 >>> >>> >>> The DUT is a Venkel 2.2 uF 100v 1812-size ceramic cap. I need to run >>> it at 48 volts. 0.8 uF is probably OK. I have room on my board so I >>> guess I'll add another cap in parallel. >> >> or in series, I believe there are some automotive standards that call >> for that on high current lines because ceramics tend to fail short with >> mechanical stress >> > > Two of those caps in series would make about half the capacitance of > two in parallel, but ESR and ESL would suffer by 4:1. > > We don't see many ceramic cap failures. Our worst parts are "sealed" > relays that actually aren't. Some switches, too. > > We don't use surface-mount film caps. They are awful. Even the PPS type? John