Failure Rate Calculation
Failure in Time Values (FIT, MTBF)
Our steady state FIT values are calculated per Telcordia SR-332 Issue 4 (2016). These calculations are based on the following conditions:
Environment Ground, Fixed, Controlled
Device Method I-D
Quality Level II
Electrical stress 100%
Operating Temperature 85°C
Activation energy 0.15 eV
MTBF = 109 (hours) / FIT
| Telcordia SR-332 Issue 4* | ||||
|---|---|---|---|---|
| 90% UCL | 60% UCL | |||
| RF Magnetics | FITs (ppb hours) |
MTBF (hours) |
FITs (ppb hours) |
MTBF (hours) |
| Chip inductors, air core inductors, RFID coils | 0.27 | 3.70E+09 | 0.23 | 4.348E+09 |
| Tunable inductors | 4.97 | 2.01E+08 | 3.59 | 2.786E+08 |
| Broadband conical inductors | 0.67 | 1.49E+09 | 0.51 | 1.961E+09 |
| Wideband RF transformers / baluns / chip transformers | 13.92 | 7.18E+07 | 9.71 | 1.030E+08 |
| Power Magnetics | ||||
| SMT and THT power inductors | 0.67 | 1.49E+09 | 0.51 | 1.961E+09 |
| Coupled power inductors | 15.43 | 6.48E+07 | 10.55 | 9.479E+07 |
| Transformers / Current sensors | 15.43 | 6.48E+07 | 10.55 | 9.479E+07 |
| EMI Magnetics | ||||
| CM chokes | 15.43 | 6.48E+07 | 10.55 | 9.479E+07 |
*Note: All calculations are based on the following conditions: Ground, Fixed, Controlled Environment, I-D Device Method, Quality Level II, 100% electrical stress, 85°C operating temperature, and 0.15 eV activation energy.