AN503: SCM5B Failure Rate Calculation and Prediction
Application Note
Failure rate calculations for the SCM5B modules are derived from the MIL-HDBK-217E specification. The stress-analysis method is used at ground benign environment, 35°C temperature, and quality level of B-2 to D-1 depending on the part. Our specified humidity level is 95% RH noncondensing.
MODEL FAILURES/106 HRS MTBF (HRS)
SCM5B30/31/32/37/392-xx 1.54 650,000
SCM5B33-xx 2.14 468,000
SCM5B40/41-xx 1.46 680,000
SCM5B38/39/42/43/49-xx 1.35 740,000
SCM5B34/35/36-xx 1.48 675,000
SCM5B45-xx 1.84 545,000
SCM5B47-xx 1.50 670,000
SCMPB01, 05 1.83 546,000
SCMPB02, 06 2.16 463,000
SCMPB03 0.19 5,150,000
SCMPB04 0.23 4,430,000
Estimated actual failure rates are predicted to be much lower due to 100% powered burn-in for 48 hours at 85°C. The typical measured failure rate for the 5B modules is 0.34 failures per 106 hours (2,900,000 hours MTBF).