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TA7818-AL flyback transformer

for Microsemi PD70211 PD Controller

RoHS compliant
  • Selected for the Microsemi PD70211EVB51F-12 evaluation board.
  • Designed for 51 W PoE++ IEEE 802.3at-2009 applications.

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Count Unit price
1 $5.06
240 $4.35
480 $3.78
1200 $3.29
2400 $2.82
4800 $2.58

For high volume or non-stock items, request a quote.

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Typical Application

Works with Microsemi PD70211

Input Voltage Output 1 Power Fsw
Sec Aux
36 V 57 V 12 V , 4.25 A 13 V , 0.03 A 51 W 10 kHz


Electrical specifications at 25°C.

Part number
(Hover for schematics)
at 0A (µH) 2
(Tolerance: ±10%)
min at   5 A (µH)
DCR max (Ω) 3 Leakage
max (µH) 4
Turns Ratio 5 Isolation
Voltage (Vrms) 6
Pri Sec Aux Pri : Sec : Aux
TA7818-AL 24.0 22.0 0.024 0.008 0.130 0.3 1 : 0.5 : 0.6 1500
  1. Output is with the secondary windings connected in parallel. Output of the auxiliary winding is 13 V, 30 mA
  2. Inductance is for the primary, measured at 10 kHz, 0.1 Vrms, 0 Adc.
  3. DCR is with the windings connected in parallel.
  4. Leakage inductance is for the primary winding, measured with all other pins shorted.
  5. Turns ratio is with primary windings connected in parallel and secondary windings connected in parallel.
  6. 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.
RoHS compliant
Ambient temperature range:
–40°C to +125°C
Storage temperature range:
Component: –40°C to +125°C
Tape and reel packaging: –40°C to +80°C
Failures in Time (FIT) / Mean Time Between Failures (MTBF):



The primary windings and the secondarty
windings to be connected in parallel on
the PC board.

Physical characteristics



General specification

Core Material:
25.4 g
24 parts per tray


Moisture Sensitivity Level (MSL):
1 (unlimited floor life at <30°C / 85% relative humidity)
Resistance to soldering heat:
Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles
Refer to Soldering Coilcraft Components before soldering.
PCB Washing:
Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.