Jason, I just learned something new. It has been a good day. Thanks, rich! On 12/3/2017 7:13 AM, 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/00= 05 > > Relevant stackoverflow post "How to derate a ceramic capacitor for DC > bias": > https://electronics.stackexchange.com/questions/280719/how-to-derate-a-ce= ramic-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 already >>>> 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 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .