Coilcraft Q4435-BL Surface Mount Flyback Regulator Transformer
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Q4435-BL Surface Mount
Flyback Regulator Transformer

  • For flyback regulator applications using LM258X SIMPLE SWITCHER®
  • Recommended and approved by National Semiconductor
  • Input voltage: 4 – 6 V
  • 500 Vrms isolation between windings
  • RoHS-compliant – 260°C compatible. Tin-silver over tin over copper clad steel.
  • COTS Plus tin-silver-copper and tin-lead terminations available
  • Custom versions available


ref #
Part number
Click for
L at
0 Adc
±15% (µH)
L at Ipk
min (µH)
max (Vµsec)
max (µH)
DCR (Ohms)2 Turns
Output Ipk3
Pri Sec
T1 Q4435-BL 22 19.0 166.5 0.7 0.020 0.025 1 : 1 5 V, 1.6 A 4.85
1 Leakage inductance measured across the primary at 0.10 Vrms, 100 kHz.
2 DCR measured at 25°C. For other operating temperatures,
use this DCR at Temperature calculator.
3 DC current at which the primary inductance is measured.
4 Ambient temperature range: −40°C to +85°C
5 Storage temperature range: Component: −40°C to +85°C
Packaging trays: −40°C to +80°C
6 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: April 16, 2018