TA7818-AL flyback transformer for Microsemi PD70211 PD Controller | Coilcraft
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SMT Flyback Transformer for
Microsemi PD70211 PD Controller

  • Selected for the Microsemi PD70211EVB51F-12 evaluation board.
  • Designed for 51 W PoE++ IEEE 802.3at-2009 applications.
  • 12 V, 4.25 A output; 36 – 57 Volt input; operates at 250 kHz
  • Auxiliary winding output: 13 V, 30 mA
  • 1500 Vrms isolation, one minute pri to sec; 500 Vrms pri to aux; 1000 Vrms all windings to the core
  • RoHS-compliant  260°C compatible. Tin-silver-copper over tin over nickel over phos bronze terminations


Part number
Click to get parts
L at 0A1
±10% (µH)
L at Ipk2
min (µH)
DCR max3
L max (µH)4
Turns ratio5 Ipk3
pri : sec pri : aux
TA7818-AL 24.0 22.0 0.024 (pri)
0.008 (sec)
0.13 (aux)
0.3 1 : 0.5 1 : 0.6 5.0 12 V, 4.25 A
1 Inductance is for the primary, measured at 10 kHz, 0.1 Vrms, 0 Adc
2 Ipk: Peak primary current drawn at minimum input voltage.
3 DCR for the primary and secondary is with windings connected in parallel. DCR measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
4 Leakage inductance is for the primary, measured with all other pins shorted.
5 Turns ratio is with primary windings connected in parallel and secondary windings connected in parallel
6 Output is with the secondary windings connected in parallel. Output of the auxiliary winding is 13 V, 30 mA
7 Ambient temperature range: –40°C to +125°C
8 Storage temperature range: Component: −40°C to +125°C
Tape and reel packaging: −40°C to +80°C
9 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: November 04, 2019