Coilcraft D1766-AL PoE Transformer for Linear Technology LTC4267
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Flyback Transformer for
Linear Technology LTC4267

  • Designed for use with Linear Technology LTC4267 PoE PD interface
  • 36 – 72 V input; 3.3 V 2.5 and 1.8 V output
  • 1500 Vrms primary to secondary isolation
  • Ideal for use in isolated converters and isolated power supplies
  • RoHS-compliant. 260°C compatible. Tin-silver (96.5/3.5) over tin over nickel over phos bronze terminations.


Part number1
Click to get parts
L at 0A2
±10% (µH)
L at Ipk3
min (µH)
DCR max4
max (µH)
Turns ratios Ipk3
D1766-AL_ 221 200 0.420 (1-3)
0.013 (8-5)
0.013 (7-6)
0.015 (10-9)
0.030 (12-11)
5.1 9.6 : 1 (pri : S1)
24 : 1 (pri : S2,S3)
1.5 3.3 V, 0.5 A (S3)
2.5 V, 1.5 A (S2)
1.8 V, 2.5 A (S1)
1 When ordering, please specify packaging code: e.g. D1766-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, 1.1 Vrms, 0 Adc
3 Ipk: 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 is for the primary winding with the secondary windings shorted.
6 All outputs are referenced to ground.
7 Ambient temperature range: –40°C to +125°C
8 Storage temperature range: Component: −40°C to +125°C
Tape and reel packaging: −40°C to +80°C
9 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.
10 Electrical specifications at 25°C.
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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Updated: April 16, 2018