Coilcraft DA2257-AL PoE Transformer for TI LM5071and LM5072
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SMT 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
  • 2000 Vrmsisolation from primary and aux to secondaries
  • 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
  • RoHS-compliant. 260°C compatible. Tin-silver over tin over nickel over phos bronze terminations


Part number1
Click to get parts
L at 0 A2
L at Ipk3
min (µH)
DCR max4
L max5
Turns ratio Ipk2
DA2257-AL_ 35.0 30.0 0.225 (aux) 0.95 2 : 1 (pri : aux) 2.7 10 V, 0.05 A (aux)
0.138 (gate) 3.6 : 1 (pri : gate) 5.5 V, 0.05 A (gate)
0.010 (sec 1) 6 : 1 (pri : sec 1) 3.3 V, 2.0 A (sec 1)
0.018 (sec 2) 3.6 : 1 (pri : sec 2) 5.0 V, 1.0 A (sec 2)
0.062 (pri)
1 When ordering, please specify packaging code: e.g. DA2257-ALD
Packaging: D = 13" reel, machine-ready 
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 250 kHz, 0.2 Vrms, 0 Adc
3 Ipk is peak primary current drawn at minimum input voltage.
4 DCR measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
5 Leakage inductance measured on the primary winding with all secondary pins shorted.
6 Ambient temperature range: –40°C to +85°C
7 Storage temperature range: Component: −40°C to +85°C
Tape and reel packaging: −40°C to +80°C
8 Resistance to soldering heat: Three reflows at >217°C for 90 seconds (+260°C ±5°C for 20 – 40 seconds), allowing parts to cool to room temperature between.
9 Electrical specifications at 25°C.
10Refer 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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Updated: April 16, 2018