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Forward Mode Transformers
for 25 Watt PoE Applications

  • Designed for forward topology operating at 250 kHz; Input voltage range: 33 – 57 V
  • Three versions for 3.3, 5.0 and 12 Volt output
  • 1500 Vrms isolation from primary and bias to secondary
  • Bias winding output: 12 V, 20 mA
  • RoHS-compliant. 260°C compatible. Tin-silver over tin over nickel over phos bronze terminations

SPECIFICATIONS


Part number1
Click to get parts
Inductance2
nom (µH)
DCR max (Ohms)3 Leakage
inductance4
max (µH)
Turns ratio5 Output6
pri sec aux pri : sec pri : aux
FCT1-33M22SL_ 95 115 8.0 347 1.44 1 : 0.16 1 : 0.63 3.3 V, 7.2 A 
FCT1-50M22SL_ 95 144 18.0 298 0.880 1 : 0.25 1 : 0.53 5.0 V, 4.8 A 
FCT1-120M22SL_ 95 150 62.5 352 0.725 1 : 0.53 1 : 0.53 12 V, 2.0 A 
1 When ordering, please specify packaging code: e.g. FCT1-120M22SLD
  Packaging: D = 13" machine-ready reel
EIA 481 embossed plastic tape (175 parts per full reel).
B = Less than full reel
In tape, but not machine-ready. To have a leader and trailer added ($25 charge), use code letter D instead.
2 Inductance measured at 250 kHz, 0.1 Vrms, 0 Adc.
3 DCR for the secondary is measured with the windings connected in parallel. DCR at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
4 Leakage inductance is for the primary winding and is measured with the secondary windings shorted.
5 Turns ratio for secondary is with the windings connected in parallel. 
6 Output of the secondary is with the windings connected in parallel. Bias winding output is 12 V, 20 mA.
7 Ambient temperature range: −40°C to +85°C
8 Storage temperature range: Component: −40°C to +85°C
Tape and reel packaging: −40°C to +80°C
9 Resistance to soldering heat: Three reflows at >217°C for 90 seconds (+260°C ±5°C for 20 – 40 seconds), allowing parts to cool to room temperature between.
10 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 11, 2017