0408_R2 www.NICcomp.com Tech Support: [email protected] AGING CHARACTERISTIC PRODUCTS: CERAMIC CAPACITORS SERIES: NCA, NCD, NCM, NCMA, NMC, NMC-H, NMC-L, NMC-M AND NMC-P Reference: EIA-521 & EIA-198-1F (Section 1.1.2- see below) EIA-198-1F TYPICAL AGING RATE OF DIELECTRIC DIELECTRIC CAPACITANCE VALUE CLASS • • • CLASS I NPO (COG) < 0.1% CLASS II X7R, X5R 1.5% ~ 4% PER DECADE HOUR CLASS III Y5V 7% PER DECADE HOUR THE AGING PHENOMENON; LOSS OF CAPACITANCE OVER TIME, IS REVERSED (RESULTING IN RECOVERY OF LOST CAPACITANCE VALUE) WHEN THE DIELECTRIC IS HEATED ABOVE IT’S CURIE TEMPERATURE (~+125°C). PCB REFLOW SOLDERING ASSEMBLY USING CERAMIC CHIP CAPACITORS (MLCCs) WILL RESULT TO DE-AGE THE DIELECTRIC AND RESET THE AGING PROCESS. POST SOLDER ASSEMBLY IN-CIRCUIT TEST (ICT) LIMITS SHOULD BE ADJUSTED TO ACCOUNT FOR DIELECTRIC AGING (SEE TABLE BELOW). EIA-198-1F DIELECTRIC CLASS DIELECTRIC TOLERANCE SUGGESTED POST- SOLDERING HEAT IN-CIRCUIT TEST (ICT) LIMITS CLASS 1 NPO (COG) ± 5% ± 5% CLASS 2 X7R, X5R ± 5% +13% / -5% ± 10% +18% / -10% CLASS 3 Y5V +80% / -20% +120% / -20% CLASS 3 Z5U ± 20% +40% / -20% EIA-198-1-F EIA STANDARD - Ceramic Dielectric Capacitors Classes I, II, III and IV – Part I: Characteristics and Requirements 1.1.2 Class II Class II ceramic dielectrics exhibit a predictable change with time and voltage. Compensation for the aging effect is made by referencing capacitance limits to a future time deemed to be most useful to the buyer; 1,000 hours is normally chosen ISO 9001–2000 REGISTERED