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Document 574 -1
Forward-Mode Transformers
* * * *
For 30 Watt Telecommunications
Designed to meet 30 W PoE objectives of IEEE 802.3at. Operates at 250 kHz with 36 - 72 Volts input 1500 Vrms isolation, primary and bias to the secondary Bias winding output: 12 V; sync winding output: 5 V
Core material Ferrite Terminations RoHS tin-silver over tin over nickel over phos bronze. Other terminations available at additional cost. Weight 10.1 - 10.7 g Ambient temperature -40C to +125C Storage temperature Component: -40C to +125C. Packaging: -40C to +80C Resistance to soldering heat Max three 40 second reflows at +260C, parts cooled to room temperature between cycles Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30C / 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 175 per 13 reel Plastic tape: 44 mm wide, 0.4 mm thick, 32 mm pocket spacing, 12.0 mm pocket depth PCB washing Only pure water or alcohol recommended
Part Inductance2 number1 min (H) FCT1-33D3SL_ FCT1-50D3SL_ FCT1-120D3SL_ FCT1-195D3SL_ FCT1-240D3SL_ 72.9 72.9 72.9 72.9 72.9
DCR max (mOhms)3 pri sec bias sync 27.5 27.5 27.5 27.5 27.5 5.0 10.0 28.5 32.0 72.5 250 250 250 235 235 160 160 160 120 120
Leakage Turns ratio5 inductance4 max (H) pri : sec pri : bias pri : sync 0.425 0.420 0.175 0.235 0.235 1 : 0.33 1:1 1 : 0.44 1:1 1:1 1:1 1 : 1.44 1 : 0.88 1 : 1.78 1 : 0.88 1 : 0.56 1 : 0.56 1 : 0.56 1 : 0.44 1 : 0.44
Output 3.3 V, 9 A 5 V, 6 A 12 V, 2.5 A 19.5 V, 1.55 A 24 V, 1.25 A
Recommended output inductor6 SER2013-472 SER1360-103 MSS1278-563 MSS1278-154 MSS1278-224
1. When ordering, please specify termination and packaging codes: FCT1-240D3SLD Termination: L = RoHS tin-silver over tin over nickel over phos bronze. Special order: T = RoHS tin-silver-copper (95.5/4/0.5) or S = non-RoHS tin-lead (63/37). 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 is measured at 250 kHz, 0.2 Vrms, 0 Adc. 3. DCR for the primary and secondary is with the windings connected in parallel. 4. Leakage inductance is for the primary windings with the secondary windings shorted. 5. Turns ratio is with the primary windings and the secondary windings connected in parallel. 6. These inductors are recommended for 30% ripple current. Ripple less than 30% may require the use of physically larger inductors. Allowing higher ripple current to make use of smaller inductors may create a risk of discontinuous output current. 7. Operating temperature range -40C to +125C. 8. Electrical specifications at 25C. Refer to Doc 362 "Soldering Surface Mount Components" before soldering.
1 2 11 12
Output inductor
Pri
4 3 5
Sec
10 9 8
Bias
6
Sync
7
The primary windings and the secondary windings are to be connected in parallel on the PC board.
Specifications subject to change without notice. Please check our website for latest information.
Document 574-1
Revised 10/28/08
(c) Coilcraft, Inc. 2009
Document 574-2
Forward-Mode Transformers - 30 Watts
Dot indicates pin 1
1 12
FCT1-xxD3SL
0.810 max 20,57
6
7
1.181 max 30,00
0.450 max 11,43
0.004 /0,10
0.084 2,13
0.969 24,6
0.827 21,0
6
0.028 7 0,72
0.130 3,30
1
0.930 23,62
0.050 1,27
Recommended Land Pattern
1 12
0.118 3,0
0.118 3,0
Dimensions are in
inches mm
Specifications subject to change without notice. Please check our website for latest information.
Document 574-2
Revised 10/28/08
(c) Coilcraft, Inc. 2009

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