Daniel Dourneau wrote: >> David VanHorn wrote: >>> I don't know if I can quickly put my finger on it, but Jim Williams of >>> Linear had published a rather good formula to predict capacitor lifetime >>> based on temperature, ripple current, applied voltage, etc.. >> >> That would be something really useful. I tried to find it through Google, >> but no luck. Can you add any information that might help in finding? >> > MIL HDBK 217E Thanks; good hint -- lots of results with Google :) See http://www.sqconline.com/reliability/capacitor1.html for an online version. For Russell: the capacitor types covered are (the full document probably contains the full description of the abbreviations): CP: Capacitor, Paper Dielectric, DC (Hermetica... CA: Capacitor, By-Pass, Radio-Interference Red... CZ, CZR: Capacitor, Feed through, Radio-Interf... CQ, CQR: Capacitor, Fixed Plastic (or Paper-Pl... CH: Capacitor, Fixed, Metaliized (Paper, Paper... CHR: Capacitor, Fixed, Metallized Paper, Paper... CFR: Capacitor, Fixed, Plastic (or Metalized P... CRH: Capacitor, Fixed Supermetallized Plastic ... CM: Capacitors, Fixed, Mica Dielectric... CMR: Capacitor, Fixed, Mica Dielectric, Establ... CB: Capacitor, Fixed, Mica Dielectric, Button ... CY: Capacitor, Fixed, Glass Dielectric... CYR: Capacitor, Fixed, Glass Dielectric, Estab... CK: Capacitor, Fixed, Ceramic Dielectric (Gene... CKR: Capacitor, Fixed, Ceramic Dielectric (Gen... CC, CCR: Capacitor, Fixed, Ceramic Dielectric ... CDR: Capacitor, Chip, Multiple Layer, Fixed, C... CSR: Capacitor, Fixed, Electrolytic (Solid Ele... CWR: Capacitor, Fixed, Electrolytic (Tantalum)... CL: Capacitor, Fixed, Electrolytic (Nonsolid E... CLR: Capacitor, Fixed, Electrolytic (Nonsolid ... CRL: Capacitor, Fixed, Electrolytic (Nonsolid ... CU, CUR: Capacitor, Fixed, Electrolytic (Alumu... CE: Capacitor, Fixed, Electrolytic (DC, Alumin... CV: Capacitor, Variable, Ceramic Dielectric (T... PC: Capacitor, Variable (Piston Type, Tubular ... CT: Capacitor, Variable, Air Dielectric (Trimm... CG: Capacitor, Fixed or Variable, Vacuum Diele... Gerhard -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist