Flyback transformers for Silicon Laboratories Si3402 PD Controller | Coilcraft
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JA4641 Flyback Transformer

  • Developed for Silicon Laboratories Si3402 PD Controller up to 15 W
  • Designed to operate in continuous mode at 250 kHz
  • 36 – 72 Vdc input
  • AEC-Q200 Grade 3 (−40°C to +85°C)
  • 1500 Vrms, one minute isolation (hipot) between primary and secondary
  • RoHS-compliant. 260°C compatible. Tin-silver over tin over nickel over phos bronze terminations


Part number1
Click for
L at 0 A
L at 2 A3
DCR max (Ohms) Leakage
L max
Turns ratio Power
pri     sec    pri : sec
JA4641-ALD 40 36 0.10 0.275 0.56 : 2 15 24 V, 0.625 A
1. Packaging: D = 13" machine-ready reel
EIA 481 embossed plastic tape (175 parts per full reel).Quantities less than full reel available: in tape (not machine ready) or with leader and trailer ($25 charge).
2. Inductance is for the primary, measured at 200 kHz, 0.2 Vrms, 0 Adc.
3. Minimum inductance for the primary, measured at 200 kHz, 0.2 Vrms, 2 Adc.
4. Leakage inductance is for the primary, measured with secondary windings shorted together.
5. Ambient temperature range: −40°C to +85°C
5. Maximum part temperature: −40°C to +125°C (Ambient + temp rise)
6. Storage temperature range: Component: −40°C to +125°C
Tape and reel packaging: −40°C to +80°C
7. Resistance to soldering heat: Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles
8. Electrical specifications at 25°C.
Refer to Soldering Coilcraft Components before soldering.
PCB washing: Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.

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Updated: July 30, 2019