Failure Rate Calculation
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The steady-state FITs is calculated =
G Q S T
(failures / billion hours) per Telcordia Technologies Special Report
SR-332, Issue 1, May 2001.
Where: G
= chosen from Telcordia SR-332, Table 7-1 Q
= 1.0 (from from Telcordia SR-332, Table 7-4 for Quality Level
II ) S
= 1.0 (from from Telcordia SR-332, Table 7-6, assuming 50% electrical
stress level) T
= 2.0 (calculated for +85° C per Table 7-7 with Ea
activation energy = 0.15)
RF
Magnetics Steady
state FITs MTBF*
Chip inductors (all sizes) 1.0 1,000,000,000
Air core "Spring"
inductors (all sizes) 1.0 1,000,000,000
90 Series axial lead inductors 1.0 1,000,000,000
RFID transponder coils 1.0 1,000,000,000
Tunable inductors (Unicoils, Slot
Series) 2.0 500,000,000
Conical broadband inductors 38 26,315,789
Wideband RF transformers, chip
transformers, baluns, directional couplers 60 16,666,667
Power
Magnetics Steady
state FIT MTBF*
Power chip inductors (all sizes) 38 26,315,789
SMT inductors (DO, DS, DT, EPL, LPD, LPO, LPS, ME, MLC, MOS, MSD, MSS, MVR, SER, SLC and XPL Series) 38 26,315,789
Fixed inductors (PCH, PCV, DMT, Mag
Amps, etc.) 38 26,315,789
Transformers (including base/gate
drive, power factor controller, planar and CCFL) 38 26,315,789
Current sensors 38 26,315,789
EMI
Magnetics and LC Filters Steady
state FIT MTBF*
Filter coils (including PDLF, PTRF, CCDLF,
TTDLF, DLF) 38 26,315,789
Common mode chokes (including DLF,
PDLF, CCDLF, TTDLF, TRF, PTRF, TTTRF, P32xx, BU, USB Series) 38 26,315,789
Filtered connectors (including
TRFRJ, PCRJ) 38 26,315,789
Filter assemblies (including PxLP
and SxxP) 12 83,333,333
xDSL Magnetics Steady
state FIT MTBF*
xDSL transformers 38
26,315,789
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G
Q