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Forward Mode Transformers
for 30 Watt Telecommunications

  • Designed for applications up to 30 Watts in forward converter topologies.
  • Developed to meet IEEE 802.3at-2009 standard.
  • 36 – 72 V input
  • 250 kHz switching frequency
  • 1500 Vrms winding to winding isolation
  • 12 V aux winding output; 5 V sync winding output
  • RoHS-compliant. 260°C compatible. Tin-silver over tin over nickel over phos bronze terminations

SPECIFICATIONS


Part number1
Click to get parts
L min2
(µH)
DCR max (Ohms) Leakage
L max4
(µH)
Turns ratio5 Output
pri3 sec3 bias sync pri : sec pri : bias pri : sync
FCT1-33D3SL_ 72.9 27.5 5.0 250 160 0.425 : 0.33 : 1 : 0.56 3.3 V, 9 A
FCT1-50D3SL_ 72.9 27.5 10.0 250 160 0.420 : 0.44 : 1 : 0.56 5 V, 6 A
FCT1-120D3SL_ 72.9 27.5 28.5 250 160 0.175 : 1 : 1 : 0.56 12 V, 2.5 A
FCT1-195D3SL_ 72.9 27.5 32.0 235 120 0.235 : 1.44 : 0.88 : 0.44 19.5 V, 1.55 A
FCT1-240D3SL_ 72.9 27.5 72.5 235 120 0.235 : 1.78 : 0.88 : 0.44 24 V, 1.25 A
1 When ordering, please specify packaging code: e.g. FCT1-240D3SLD
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 tested at 250 kHz, 0.2 Vrms, 0 Adc
3 DCR is 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 with the secondary windings shorted.
5 Turns ratio is with the primary windings and the secondary windings connected in parallel.
6 Ambient temperature range: −40°C to +125°C
7 Storage temperature range: Component: −40°C to +125°C
Tape and reel packaging: −40°C to +80°C
8 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.
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: October 30, 2017