Coilcraft Q4339-BL Flyback Regulator Transformer
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Flyback Regulator Transformer

  • For flyback regulator applications using LM258X SIMPLE SWITCHER®
  • Recommended and approved by National Semiconductor
  • Input voltage: 18 – 36 V
  • 500 Vrms isolation between windings
  • RoHS-compliant – Tin-silver over tin over nickel over phos bronze.
  • COTS Plus tin-silver-copper and tin-lead terminations available
  • Custom versions available


ref #
Part number
Click to get parts
L at
0 Adc
±15% (µH)
L at Ipk
min (µH)
max (Vµsec)
max (µH)
DCR (Ohms)2 Turns
Output Ipk3
Pri Sec
T6 Q4339-BL 66 59.4 499.5 3.0 0.090 0.20 (8-7)
0.24 (6-5)
1 : 1.2
1 : 1.2
12 V, 0.63 A
12 V, 0.63 A
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