Coilcraft FCT1-50M2SL Forward Converter Transformer for NSCLM5015 DC-DC Regulator
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Forward Converter Transformer
for NSC LM5015

New part number is shown. FCT1-50M1SL has been replaced by FCT1-50M2SL. The replacement part is identical to the old part; only the part number has changed.
  • Developed for National Semiconductor LM5015 DC-DC Regulator
  • Referenced on NSC application note AN-1724 as CA2983-CL
    and on AN-1725 as GA2983-CL
  • Designed for forward topology operating at 250 kHz
  • 1500 Vrms primary to secondary isolation
  • Auxiliary winding output: 10 V, 20 mA
  • RoHS-compliant. 260°C compatible. Tin-silver over tin over nickel over phos bronze terminations


Part number1
Click to get parts
nom (µH)
DCR max (Ohms)3 Leakage
max (µH)
Turns ratio5 Output6
pri sec aux pri : sec pri : aux
FCT1-50M2SL_ 705 55 13.5 320 0.425 1 : 0.33 1 : 0.67 5.0 V, 3.0 A
1 When ordering, please specify packaging code: e.g. FCT1-50M2SLD
  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, 0.5 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. Auxiliary winding output is 10 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 16, 2018