Failure Rate Calculation Failure in Time Values (FIT, MTBF)

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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 50%
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, 50% electrical stress, 85°C operating temperature, and 0.15 eV activation energy.

Failure Rate Calculation

Failure in Time Values (FIT, MTBF)

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