3D Model Datasheet

DA2257-AL PoE Transformer

for TI LM5071 and LM5072

Developed for Texas Instruments LM5071 and LM5072 PD Controllers
Specified in TI application note AN-1430
Designed to operate in continuous mode at 250 kHz with input voltage of 14 – 60 V
Can accept 12 V input from auxiliary sources.
Dual secondaries, separate aux and gate windings
Industry standard EP13 surface mount package
Coilcraft's DA2383-AL and FA2519-AL are also specified by TI for LM5071 and LM5072
The FA2677-AL is specified by TI for LM5072

Buy Now:

Count	Unit price
1	$2.57
175	$2.36
700	$2.14
1400	$1.79
2800	$1.59
5000	$1.45

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

Packaging

D = 13" machine-ready reel

. in stock, ready to ship today.

Request a Sample:

Typical Application

Works with Texas Instruments LM5071

Input Voltage	Output				Power	Fsw
Input Voltage	Sec1	Sec2	Gate	Aux	Power	Fsw
14 V — 60 V	3.3 V , 2 A	5 V , 1 A	5.5 V , 0.05 A	10 V , 0.05 A	11.6 W	250 kHz

Specifications

Electrical specifications at 25°C.

Part number 1 (Hover for schematics)	Inductance at 0A (µH) 2 (Tolerance: ±10%)	Inductance min at 2.7 A (µH)	DCR max (Ω) 3					Leakage Inductance max (µH) 4	Turns Ratio	Isolation Voltage (Vrms) 5
Part number 1 (Hover for schematics)	Inductance at 0A (µH) 2 (Tolerance: ±10%)	Inductance min at 2.7 A (µH)	Pri	Sec1	Sec2	Gate	Aux	Leakage Inductance max (µH) 4	Pri : Sec1 : Sec2 : Gate : Aux	Isolation Voltage (Vrms) 5
DA2257-AL_	35.0	30.0	0.062	0.010	0.018	0.138	0.225	0.95	1 : 0.167 : 0.278 : 0.278 : 0.5	2000

Notes

When ordering, please specify packaging code: e.g. DA2257-ALD
Inductance is for the primary, measured at 250 kHz, 0.2 Vrms, 0 Adc.
DCR measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
Leakage inductance is for the primary winding with all other pins shorted.
2000 Vrmsisolation from primary and aux to secondaries.

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

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

See FIT/MTBF Calculations

Schematics

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:

6.35g

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 with pure water or alcohol only. More Info.

Warehouses

Language settings

Currency settings

DA2257-AL PoE Transformer

for TI LM5071 and LM5072

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