陶瓷电容失效率计算
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Doc. No : MT-FRR8_E
Failure rate of Monolithic Ceramic Capacitors
QA section, M.L.C.Group
FUKUI MURATA MFG, CO.,LTD
1. Basic standards
Test of failure rate shall be performed in accordance with
MIL-STD-690, MIL-C-39014, MIL-HDBK-217, and JIS-C-5003.
2. Failure mode
Failure modes are Open, Short, and other electrical items which
are critical defects for Monolithic Ceramic Capacitors.
3. Calculation of failure rate
3-1. Confidence level
Failure rate is calculated in the confidence level 60%.
3-2. Formula of failure rate
FR = ( r/T ) x K x 109 ( Fit )
FR : Failure rate ( Fit= 0.0001%/1000 hours )
r : Number of accumulated failures ( r x K=0.917, if r=0 )
T : Accumulated component hours
K : Coefficient of confidence level 60% ( Please refer to table 1)