Re:An alternative to solid tantalum capacitors
by dragontamer on Wednesday March 29, 2017 @09:32AM
(#13986015)
> Could you provide some insight into why for tantalums the ESR is specified, while for these ceramics they are not?
Ceramics are highly frequency dependent. Almost every parameter changes with frequency: capacitance, ESR, ESL... you gotta look at charts.
For the most part, when picking a Ceramic Cap... you pick a dielectric (NP0 for voltage and temperature stability and accuracy... X5R for "high" values like 10uF).
> How should I go about filtering them at Farnell/Mouser
The only methodology that seems to work for me is to learn the various types of dielectrics. For the most part, the properties of NP0 ceramic capacitors are the same across all the companies.
Class 1 (typically NP0) and Class 2 (typically X7R... but X7S, X5R or whatever is fine) are your main types. Class 1 for temperature and voltage stability and accuracy at the nanoFarad range, Class 2 for "high" values like 10uF.
Ceramics are highly frequency dependent. Almost every parameter changes with frequency: capacitance, ESR, ESL... you gotta look at charts.
For the most part, when picking a Ceramic Cap... you pick a dielectric (NP0 for voltage and temperature stability and accuracy... X5R for "high" values like 10uF).
> How should I go about filtering them at Farnell/Mouser
The only methodology that seems to work for me is to learn the various types of dielectrics. For the most part, the properties of NP0 ceramic capacitors are the same across all the companies.
Class 1 (typically NP0) and Class 2 (typically X7R... but X7S, X5R or whatever is fine) are your main types. Class 1 for temperature and voltage stability and accuracy at the nanoFarad range, Class 2 for "high" values like 10uF.