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.
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)
Failures in Time (FIT) / Mean Time Between Failures (MTBF)
38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332
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 Only pure water or alcohol recommended
Leakage
Input
voltage
range (V)
DCR max (mOhms)3
Turnsratio5
Part
Inductance2
nom (µH)
inductance4
max (µH)
number1
pri
sec
aux
pri : sec
pri : aux
Output6
FCT1-33K2SL_
FCT1-50K2SL_
FCT1-90K2SL_
FCT1-120K2SL_
FCT1-150K2SL_
120
120
120
120
120
48
48
48
48
48
53
88
218
420
532
720
735
745
705
732
0.195
0.205
0.165
0.170
0.215
9
9
9
9
9
–
–
–
–
–
18
18
18
18
18
1 : 1.0
1 : 1.4
1 : 2.3
1 : 3.0
1 : 3.7
1 : 2.8
1 : 2.8
1 : 2.8
1 : 2.8
1 : 2.8
3.3 V, 1.2 A
5 V, 0.8 A
9 V, 0.44 A
12 V, 0.33 A
15 V, 0.27 A
1. When ordering, please specify a packaging code:
FCT1-50K2SLD
Packaging: D = 13″ machine ready reel. EIA-481 embossed plastic tape
(350 parts per full reel).
Dot above pin1
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 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.
0.355
9,02
max
6. Output is with the secondary windings connected in parallel. Auxiliary winding output is 10 V, 20 mA.
7. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
0.004/0,10
0.041
1,05
0.520
max
13,21
Recommended
Land Pattern
1
8
7
0.339
8,60
0.028
0,70
Primary
0.080
2,03
0.370
9,40
0.098
2,50
Secondary
5
2
1
4
6
5
3
0.430
10,92
max
Auxiliary
0.098
2,50
4
1
0.050
1,27
8
Secondary winding 7
and FCT1-150K2SL. For other parts, secondary
windings to be connected in parallel on PC board.
–
6 not used on FCT1-120K2SL
inches
mm
Dimensions are in
Specifications subject to change without notice.
Please check our website for latest information.
Document715 Revised02/18/09
© Coilcraft, Inc. 2009
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