SMT PoE Transformer
for NSC LM5071 and LM5072
- Developed for National Semiconductor LM5071 and LM5072 PD Controllers
- Specified in NSC 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 Vrms isolation from primary and aux to secondaries
- Coilcraft's DA2383-AL and FA2519-AL are also specified by NSC for LM5071 and LM5072
- The FA2677-AL is specified by NSC for LM5072
- RoHS-compliant. 260°C compatible. Tin-silver over tin over nickel over phos bronze terminations
Photo 
Pricing 
Materials declaration 
PDF data sheet
SPECIFICATIONS
Dimensions 
Schematic
Tape and reel specifications
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| 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) | ||||||||
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| 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. |
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| 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 | Leakage inductance measured on the primary winding with all secondary pins shorted. | |
| 5 | Ambient temperature range: | –40°C to +85°C |
| 6 | Storage temperature range: | Component: –40°C to +85°C T&R packaging: –40°C to +80°C |
| 7 | 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. | |
| 8 | Electrical specifications at 25°C. | |
| Refer to Soldering Coilcraft Components before soldering. | ||