3D Model Datasheet

SMT Flyback Transformers

for Silicon Laboratories Si3402

Specified by Silicon Laboratories for Si3402 PD Controller up to 15W output
Designed for IEEE 802.3af-compliant PoE applications
Power inductor DO5010H-333 also specified for the circuit.

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Count	Unit price
1	$3.84
175	$3.30
700	$2.06
1400	$1.61
2800	$1.38
5000	$1.27

For high volume or non-stock items, request a quote.

Packaging

D = 13" machine-ready reel

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Typical Application

Works with Skyworks Si3401/Si3402

Part number	Input Voltage	Output 1	Power	Fsw
FA2924-AL_	36 V — 72 V	3.3 V , 4.5 A	15 W	200 kHz
FA2805-CL_	36 V — 72 V	5 V , 3 A	15 W	200 kHz
FA2925-AL_	36 V — 72 V	12 V , 1.25 A	15 W	200 kHz

Specifications

Electrical specifications at 25°C.

Part number 2 (Hover for schematics)	Inductance at 0A (µH) 3 (Tolerance: ±10%)	Inductance min at 2 A (µH)	DCR max (Ω) 4		Leakage Inductance max (µH) 5	Turns Ratio 6	Isolation Voltage (Vrms) 7
Part number 2 (Hover for schematics)	Inductance at 0A (µH) 3 (Tolerance: ±10%)	Inductance min at 2 A (µH)	Pri	Sec	Leakage Inductance max (µH) 5	Pri : Sec	Isolation Voltage (Vrms) 7
FA2924-AL_	40.0	36.0	0.100	0.025	0.666	1 : 0.3	1500
FA2805-CL_	40.0	36.0	0.108	0.040	0.621	1 : 0.4	1500
FA2925-AL_	40.0	36.0	0.100	0.155	0.566	1 : 1	1500

Notes

Output is with the secondary windings connected in parallel.
When ordering, please specify packaging code: e.g. FA2925-ALD
Inductance is for the primary, measured at 200 kHz, 0.2 Vrms, 0 Adc.
DCR for the secondary is per winding.
Leakage inductance measured between pins 1 and 2 with all secondary pins shorted.
Turns ratio is with the secondary windings connected in parallel.
1500 Vrms, one minute isolation between primary and secondary.

Termination:

RoHS-compliant. 260°C compatible. Tin-silver over tin over nickel over phos bronze terminations. Other terminations available at additional cost.

Packaging:

D = 13″ machine-ready reel. EIA-481 embossed plastic tape (175 parts per full reel). Quantities less than full reel available: in tape (not machine ready) or with leader and trailer ($25 charge).
B = Less than full reel. In an effort 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.

Environmental

Environmental:

RoHS compliant

Ambient temperature range:

–40°C to +85°C

Storage temperature range:

Component: –40°C to +85°C.
Tape and reel packaging: –40°C to +80°C

Maximum part temperature:

+125°C

Failures in Time (FIT) / Mean Time Between Failures (MTBF):

See FIT/MTBF Calculations

Schematics

Secondary windings to be connected
in parallel on the PC board

Physical characteristics

Tape and Reel specification

Parts per reel	Reel dimensions (mm)					Tape dimensions (mm)						Orientation
13" (330 mm)	A	B	C	D	E	W	P	Po	P1	H	T
175	330	100	13	38,4	32,4	32	28	4	2	12,93	0,5

General specification

Core Material:

Ferrite

Weight:

6.57 – 6.71 g

Packaging:

175 per 13″ reel Plastic tape: 32 mm wide, 0.5 mm thick, 28 mm pocket spacing, 12.93 mm pocket depth

Soldering/Washing

Moisture Sensitivity Level (MSL):

1 (unlimited floor life at <30°C / 85% relative humidity)

Resistance to soldering heat:

Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles

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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SMT Flyback Transformers

for Silicon Laboratories Si3402

Selected configuration not available

Typical Application

Specifications

Termination:

Packaging:

Schematics

Physical characteristics

Tape and Reel specification

General specification

Soldering/Washing

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Warning