Coilcraft C1154 Dual Output Flyback Transformer
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Dual Output Flyback Transformer
for PoE

  • Developed for Maxim MAX5941A PoE Interface/PWM Controller
  • 18 – 72 V input
  • Secondary windings for 3.3 V and 2.5 V output
  • 14 V bias winding output; 5 V drive winding output
  • 1500 Vrms, one minute primary/bias to secondary/drive isolation
  • RoHS-compliant. 260°C compatible. Tin-silver (96.5/3.5) over tin over nickel over phos bronze terminations


Part number1
Click for samples
L at 0A2
±10% (µH)
L at Ipk3
min (µH)
DCR max4
max (µH)
Turns ratio Ipk2
C1154-BL_ 255.0 229.5 0.335 (N1)
0.020 (N2)
0.017 (N3)
0.200 (N4)
0.745 (N5)
5.0 1 : 0.10 (N1 : N2)
1 : 0.075 (N1 : N3)
1 : 0.125 (N1 : N4)
1 : 0.425 (N1 : N5)
0.25 3.3 V (N2)
2.5 V (N3)
1 When ordering, please specify packaging code: e.g. C1154-BLD
  Packaging: D = 13" machine-ready reel
EIA 481 embossed plastic tape (200 parts per full reel). Quantities less than full reel available: in tape (not machine ready) or with leader and trailer ($25 charge).
B = Less than full reel
In an effort to simplify our part numbering system, Coilcraft is eliminating the need for multiple packaging codes. When ordering, simply change the last letter of your part number from B to D.
2 Inductance is for the primary, measured at 275 kHz, 1.0 Vrms
3 Ipk: Peak primary current drawn at minimum input voltage.
4 DCR measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
5 Leakage inductance is for the primary winding with the secondary windings shorted.
Refer to Soldering Coilcraft Components before soldering.
PCB washing: Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info

Your comments and suggestions are welcome. Contact [email protected]
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Updated: February 18, 2020