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Document 616
Toroidal Transformer – Q3903-AL
• Specified by ON Semiconductor for use with their NCP1605 PFC
Controller.Referenced as X25, pulse transformer on evaluation
board NCP1605FORWGEVB and Application Note AND8292.
• Recommended byTexas Instruments for use with their UC3875
Phase Shift Resonant Controller.
• Three 1:1 windings
• 500 Vrms, one minute winding-to-winding isolation.
Core material Ferrite
Terminations  RoHS compliant tin-silver over tin over nickel over
brass. Other terminations available at additional cost.
Weight  4.3 g
Ambient temperature  –40°C to +85°C
Storage temperature  Component: –40°C to +85°C.
Tray packaging: –40°C to +80°C
Moisture Sensitivity Level (MSL)  1 (unlimited floor life at <30°C /
85% relative humidity)
Failures in Time (FIT) / Mean Time Between Failures (MTBF)
38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332
Packaging  49 per tray
PCB washing  Tested with pure water or alcohol only. For other solvents,
see Doc787_PCB_Washing.pdf
Part Inductance1 DCR max2
number
min (µH)
(Ohms)
Q3903-AL
210
0.090
Inter-winding
isolation
(Vrms)
500
1. Inductance measured between pins 1 and 6, at 15.75 kHz, 0.015 Vrms,
0 Adc using an Agilent/HP 4192A impedance analyzer.
2. DCR is per winding, measured on Cambridge Technology micro-
ohmmeter or equivalent.
3. Electrical specifications at 25°C.
1
2
3
Notch indicates pin1
0.72
18,29
0.95
24,13
6
5
0.65
16,51
4
1
6
2
5
3
0.01256 × 0.30
0,319 × 0,75
1
0.475
12,07
0.19 ± 0.02
4,83 ± 0,51
0.140
3,56
6
4
1:1:1
34
0.638
16,21
0.051
1,3
Recommended
PC Board Layout
Dimensions are in
inches
mm
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Document 616  Revised 05/27/09
© Coilcraft Inc. 2013
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.