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Failure Rate Calculation

 FIT View data sheet in Acrobat PDF format

The steady-state FITs is calculated = GQST (failures / billion hours) per Telcordia Technologies Special Report SR-332, Issue 1, May 2001.

Where:
G = chosen from Telcordia SR-332, Table 7-1 (90% upper confidence level)
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 eV)


RF Magnetics
Steady state FITs
(failures/billion hours)
MTBF*
(hours)
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 FITs 
(failures/billion hours)

MTBF*
Power chip inductors (PS, FS – all sizes) 38 26,315,789
SMT inductors (DH, DO, DS, DT, EPL, LPD, LPO, LPS, ME, MLC, MOS, MSD, MSS, MVR, PFL, SER, SLC, XAL, XFL and XPL Series) 38 26,315,789
Coupled power inductors (LPD, MSD, PFD) 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 FITs 
(failures/billion hours)

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 FITs 
(failures/billion hours)

MTBF*
xDSL transformers 38 26,315,789
* Calculated from FITs (MTBF=109 (hours) / FITs)