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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).
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