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Flyback Transformers for
Power over Ethernet

  • Developed for Powered Devices (PD) in IEEE 802.3af compliant PoE applications
  • Designed to operate in continuous mode
  • 36 – 72 V input with versions for 3 Watt, 7 Watt and 13 Watt output
  • Bias winding output: 12 V, 20 mA
  • 250 kHz switching frequency
  • 1500 Vrms, 1 minute isolation (hipot) from primary and bias to secondary; 500 Vrms, 1 minute isolation between all other windings
  • RoHS-compliant. 260°C compatible. Tin-silver over tin over nickel over phos bronze terminations
  • Samples of parts in red are available in Coilcraft Designer's Kit C395

SPECIFICATIONS


Parts in red type are included in Coilcraft Designer's Kit C395
Part number1
Click for
samples
Power
(W)
L at 0 A2
±10%
(µH)
L  at Ipk3
min
(µH)
DCR (Ohms)4 Leakage
L max5
(µH)
Turns ratio6 Ipk3
(A)
Output7
pri bias sec pri:sec pri:bias
POE30P-33L_ 3 310 279.0 1.02 2.01 0.066 4.75 : 0.19 : 0.70 0.3 3.3 V, 0.91 A
POE30P-50L_ 3 310 279.0 1.02 2.01 0.118 4.50 : 0.28 : 0.70 0.3 5.0 V, 0.6 A
POE30P-12L_ 3 310 279.0 1.04 2.01 0.700 4.25 : 0.70 : 0.70 0.3 12 V, 0.25 A
POE70P-33L_ 7 155 139.5 0.414 0.822 0.036 4.00 : 0.19 : 0.667 0.65 3.3 V, 2.12 A
POE70P-50L_ 7 155 139.5 0.414 0.822 0.060 3.60 : 0.262 : 0.667 0.65 5.0 V, 1.4 A
POE70P-12L_ 7 155 139.5 0.414 0.822 0.343 3.25 : 0.667 : 0.667 0.65 12  V, 0.6  A
POE13P-33L_ 13 127 114.3 0.255 0.310 0.024 1.25 : 0.166 : 0.50 1.0 3.3 V, 4.0 A
POE13P-50L_ 13 127 114.3 0.222 0.348 0.039 0.950 : 0.25 : 0.50 1.0 5.0 V, 2.6 A
POE13P-12L_ 13 127 114.3 0.199 0.308 0.065 0.650 : 0.50 : 0.50 1.0 12 V, 1.08 A
POE13P-19L_ 13 127 114.3 0.290 0.355 0.066 0.800 : 0.567 : 0.50 1.0 19.5 V, 0.67 A
POE13P-24L_ 13 127 114.3 0.255 0.315 0.067 0.600 : 0.667 : 0.50 1.0 24 V, 0.54 A
1 When ordering, please specify packaging code: e.g. POE13P-12LD
Packaging: D = 13" machine-ready reel
EIA 481 embossed plastic tape
POE30P (350 parts per full reel); POE70P (200 parts per full reel);
POE13P (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, 0.1 Vrms, 0 Adc
3 Ipk is the peak primary current drawn at minimum input voltage.
4 DCR for the secondary is per winding, measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
5 Leakage inductance is measured between pins 3 and 4 with all other pins shorted.
6 Turns ratio is with the secondary windings connected in parallel.
7 Output of the secondary is with the windings connected in parallel. Bias winding output is 12 V, 20 mA.
8 Ambient temperature range: −40°C to +85°C
9 Storage temperature range: Component: −40°C to +85°C
Tape and reel packaging: −40°C to +80°C
10 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.
11 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: March 20, 2017