I didn't know this, and it's very interesting, thank you. At 14:13 2017-12-03, Jason White wrote: >The effective capacitance of general purpose ceramic capacitors is a >function of the DC voltage across it. In many cases the capacitance can >drop to less than half of the rated capacitance when you get near the >voltage rating of the part. > >The severity of this effect is highly dependant on the specific type of >ceramic capacitor you have - X7R, Y5V, C0G, etc. > >For decoupling a 50V part will typically perform "better" than a 6.3V one >of the same type and rating. > >See muRata's explanation: >https://www.murata.com/en-us/support/faqs/products/capacitor/mlcc/char/000= 5 > >Relevant stackoverflow post "How to derate a ceramic capacitor for DC >bias": >https://electronics.stackexchange.com/questions/280719/how-to-derate-a >-ceramic-capacitor-for-dc-bias > >On Sunday, December 3, 2017, Electron wrote: > >> >> Thank you for all replies. I would like to address one in particular: >> >> Just one question, why 50V? Just because it's very difficult to find 100= nF >> ceramic capacitors of lower voltage, or 50V specification is truly neede= d >> (but why? it's a 3.3V circuit after all). >> >> Thank you. >> >> Have a nice sunday, >> Mario >> >> >> At 00:15 2017-12-03, Richard Pope wrote: >> >Mario, >> > Yes! I won't go in to the reasons why. I bypass the Oscillator >> >and/or oscillators and all of the digital ICs. Linear VRs are also >> >bypassed but look at the datasheet to get the proper values. I mostly >> >use 0.1uF 50V Ceramics. I have at times used 0.01uF 50V Ceramics. >> >Thanks, >> >rich! >> > >> >On 12/2/2017 12:18 PM, Electron wrote: >> >> Hello, >> >> it may seem a banal question, but as it's the first time I use an >> external >> >> oscillator (with integrated crystal), I am not sure. The datasheet >> makes no >> >> mention whatsoever to the need to use a bypass capacitor in the power >> line: >> >> >> >> https://global.kyocera.com/prdct/electro/product/pdf/clock_k_e.pdf >> >> >> >> But is this truly the case? >> >> >> >> Should I put a (100nF?) bypass capacitor anyway in your opinion? >> >> >> >> Space on the board may be used for something else otherwise, so I don= 't >> >> want to put useless components. But then again who does. >> >> >> >> Also, I guess there's no advantage in grounding the metalcase on this >> >> integrated oscillator, like I use to do with Xtals. Maybe it's alread= y >> >> grounded but I haven't received it yet.. I ask in case it's not. >> >> >> >> Thank you. >> >> >> >> Kind regards, >> >> Mario >> >> >> > >> > >> >--- >> >This email has been checked for viruses by Avast antivirus software. >> >https://www.avast.com/antivirus >> > >> >-- >> >http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >> >View/change your membership options at >> >http://mailman.mit.edu/mailman/listinfo/piclist >> >> -- >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> > > >--=20 >Jason White >--=20 >http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >View/change your membership options at >http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .