Document 715

4 W Forward Mode Transformers• Designed for forward topology operating at 250 kHz• Five outputs from 3.3 V to 15 V; 9 – 18 V input• 1500 Vrms isolation from primary and aux to the secondary• Specified by National Semiconductor for its LM5015
Two-Switch Forward Regulator
Core material Ferrite
Terminations RoHS tin-silver over tin over nickel over phos bronze.
Other terminations available at additional cost.
Weight 2.0 – 2.1g
Ambient temperature –40°C to +85°C
Storage temperature Component: –40°C to +85°C.
Tape and reel packaging: –40°C to +80°C
Resistance to soldering heat Max three 40 second reflows at+260°C, parts cooled to room temperature between cycles
Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30°C /85% relative humidity)
Packaging 350 per 13″ reel Plastic tape: 32 mm wide, 0.42 mm thick,
20 mm pocket spacing, 9.16 mm pocket depth
PCB washing Tested with pure water or alcohol only. For other solvents,
see Doc787_PCB_Washing.pdf.						Leakage
3PartInductance2	    DCR max (mOhms)
inductance4
number1nom (µH)
prisecauxmax (µH)
FCT1-33K2SL_120
4853
7200.195
FCT1-50K2SL_120
4888735
0.205
FCT1-90K2SL_120
48218745
0.165
FCT1-120K2SL_120
484207050.170
FCT1-150K2SL_120
485327320.215

Input		Turns ratio5
voltage
range (V)pri : sec   pri : aux	 Output6
9 – 181 : 1.0
1 : 2.8
3.3 V, 1.2 A
9 – 181 : 1.4
1 : 2.8
5 V, 0.8 A
9 – 18
1 : 2.3
1 : 2.8
9 V, 0.44 A
9 – 18
1 : 3.0
1 : 2.8
12 V, 0.33 A
9 – 18
1 : 3.71 : 2.8
15 V, 0.27 A

1. When ordering, please specify a packaging code:
FCT1-50K2SLD
D = 13″ machine ready reel. EIA-481 embossed plastic tape(350 parts per full reel). Quantities less than full reel available: in tape (not machine ready) or withleader and trailer ($25 charge).
B = Less than full reel. 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 measured at 250 kHz, 0.2 Vrms, 0 Adc.
3. DCR for the secondary is measured with the windings connected in parallel.
4. Leakage inductance is for the primary and is measured with the secondary shorted.
5. Turns ratio is with the secondary windings connected in parallel.
6. Output is with the secondary windings connected in parallel. Auxiliary winding output is 10 V, 20 mA.
7. Electrical specifications at 25°C.
0.004 /0,10
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Packaging:

1Primary
2
387

Recommended
Land PatternSecondary
65

0.080
2,0310.370
9,40

0.098
2,50

Dot above pin10.355 max
9,020.041
1,050.520 max
13,210.339
8,60
50.0280,70

40.430 max
10,92

Auxiliary
4
Secondary winding 7 – 6 not used on FCT1-120K2SL
and FCT1-150K2SL. For other parts, secondary windings to be connected in parallel on PC board.

Dimensions are ininches
mm

0.050
1,27

US +1-847-639-6400 sales@coilcraft.com
UK +44-1236-730595 sales@coilcraft-europe.com
Taiwan +886-2-2264 3646 sales@coilcraft.com.tw
China +86-21-6218 8074 sales@coilcraft.com.cn
Singapore + 65-6484 8412 sales@coilcraft.com.sg

1Document 715

0.098
2,50
8

Revised 02/18/09© Coilcraft Inc. 2021
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.