Document 608
For Silicon Laboratories Si3400
Flyback Transformers and Si3401 PD Controllers
• Designed for Power over Ethernet PD controllers for appli-
cations up to 15 Watts.
• Operates in continuous conduction mode with 36 – 57 V input
• 1500 Vrms isolation between primary and secondary
Core material Ferrite
Terminations RoHS tin-silver over tin over nickel over phos
bronze. Other terminations available at additional cost.
Weight 6.57 – 6.71 g
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 175 per 13″ reel Plastic tape: 32 mm wide,
0.5 mm thick, 28 mm pocket spacing, 12.93 mm pocket depth
PCB washing Only pure water or alcohol recommended
Inductance Inductance
Leakage
DCR max (Ohms)4
Part
Power
(W)
at 0 A2
at Ipk3
inductance5 Turns ratio6 Ipk3
number1
±10% (µH)
min (µH)
pri
sec
max (µH)
pri : sec
(A)
Output7
FA2924-AL_
FA2805-CL_
FA2925-AL_
15
15
15
40.0
40.0
40.0
36.0
36.0
36.0
0.100
0.108
0.100
0.025
0.040
0.155
0.666
0.621
0.566
13 : 4
5 :2
1 :1
2.0
2.0
2.0
3.3 V, 4.5 A
5.0 V, 3.0 A
12.0 V, 1.25 A
1. When ordering, please specify packaging code:
FA2925-ALD
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 for the primary, measured at 200 kHz, 0.2 Vrms, 0 Adc.
3. Ipk is peak primary current drawn at minimum input voltage.
4. DCR for the secondary is per winding.
Dot above pin1
5. Leakage inductance measured between pins 1 and 2 with all secondary pins shorted.
6. Turns ratio is with the secondary windings connected in parallel.
7. Output is with the secondary windings connected in parallel.
8. Electrical specifications at 25°C.
0.500
12,70
max
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
0.004/0,10
0.039
1,00
0.699
17,75
max
0.050
1,27
0.028
0,70
0.512
13,00
7
8
0.080
2,03
0.590
14,99
2
10
1
Pri
1
Sec
0.530
13,46
Recommended
Land Pattern
max
10
9
Secondary windings to be
connected in parallel on PC board
5
1
0.098
2,50
0.098
2,50
6
inches
mm
Dimensions are in
Specifications subject to change without notice.
Please check our website for latest information.
Document608 Revised10/29/08
© Coilcraft, Inc. 2009