Q3903-AL

Toroidal Transformer

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 by Texas Instruments for use with their UC3875 Phase Shift Resonant Controller.
Three 1 : 1 windings
Custom versions available

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Count	Unit price
1	$10.32
250	$9.21
500	$7.68
1000	$6.40
2500	$5.57
5000	$4.84

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Specifications

Electrical specifications at 25°C.

Part number	Inductance at 0A (µH) 1	DCR max (mΩ) 2	Isolation Voltage (Vrms)
Part number	Inductance at 0A (µH) 1	DCR max (mΩ) 2	Isolation Voltage (Vrms)
Q3903-AL	210	90.0	500

Notes

Inductance measured between pins 1 and 6, at 15.75 kHz, 0.015 Vrms, 0 Adc using an Agilent/HP 4192A impedance analyzer or equivalent.
DCR is per winding, measured at 25°C on a Cambridge Technology microohmmeter or equivalent. For other operating temperatures, use this DCR at Temperature calculator.

Termination:

RoHS compliant tin-silver over tin over nickel over brass. Other terminations available at additional cost.

Environmental

Environmental:

RoHS compliant

Ambient temperature range:

−40°C to +85°C

Storage temperature range:

Component: −40°C to +85°C
Packaging trays: −40°C to +80°C

Failures in Time (FIT) / Mean Time Between Failures (MTBF):

See FIT/MTBF Calculations

Schematics

Physical characteristics

General specification

Core Material:

Ferrite

Weight:

4.3 g

Packaging:

49 per tray

Washing

Moisture Sensitivity Level (MSL):

1 (unlimited floor life at <30°C / 85% relative humidity)

PCB Washing:

Tested with pure water or alcohol only. For other solvents, see Doc787_PCB_Washing.pdf

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