Flyback and Forward Transformers for Power over Ethernet (PoE) | Coilcraft
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Flyback & Forward Transformers
for Power over Ethernet

  • Flyback and forward transformers for PoE applications up to 72 W
  • Operates with 9 – 57 V and 33 – 57 V input
  • Dual outputs can also be configured as one single higher power output
  • 1500 Vrms, 1 minute isolation (hipot) from primary and auxillary to each secondary
  • RoHS-compliant. 260°C compatible. Tin-silver-copper over tin over nickel
    over phos bronze terminations

SPECIFICATIONS


Flyback Transformers

Part number1
Click to get parts
Power
(W)
L2
at 0 A
±10 (µH)
Isat3
(A)
DCR (mOhms) Leakage4
L max
(µH)
Turns ratio Output5
pri sec1 sec2 aux pri : sec1 : sec2: aux
POE21PR-33ED 21 21 6.2 31 10 10 80 0.30 1 : 0.231 : 0.231 : 0.692 3.3 V, 3.2 A
POE23PR-33ED 23 54 3.2 62 6.5 6.5 58 0.67 1 : 0.125 : 0.125 : 0.375 3.3 V, 3.5 A
POE22PR-50ED 22 21 6.2 31 17 17 80 0.40 1 : 0.333 : 0.333 : 0.750 5.0 V, 2.2 A
POE30PR-50ED 30 48 3.6 62 10 10 85 0.40 1 : 0.188 : 0.188 : 0.375 5.0 V, 3.0 A
POE24PR-12ED 24 21 6.3 31 52 52 72 0.15 1 : 0.750 : 0.750 : 0.666 12 V, 1.0 A
POE36PR-12ED 36 41 4.2 62 23 23 85 0.28 1 : 0.375 : 0.375 : 0.375 12 V, 1.5 A

Forward Mode Transformers

Part number1
Click to get parts
Power
(W)
L2
at 0 A
(µH)
DCR (mOhms) Turns ratio 4
L
max
(µH)
Output Volt-time6
product
(V-µsec)
pri sec1 sec2 aux pri : sec1 : sec2: aux
POE33PR-33ED 33 128±25% 17 12.5 12.5 145 1 : 0.625 : 0.625 : 0.75 0.10 3.3 V, 5.0 A 106.5
POE53PR-33ED 53 100±15% 30 6.5 6.5 120 1 : 0.167 : 0.167 : 0.50 0.40 3.3 V, 8.0 A 106.5
POE35PR-50ED 35 128±15% 17.6 23 23 340 1 : 0.875 : 0.875 : 1.75 0.15 5.0 V, 3.5 A 106.5
POE70PR-50ED 70 100±15% 30 10 10 120 1 : 0.250 : 0.250 : 0.50 0.40 5.0 V, 7.0 A 71
POE38PR-12ED 38 128±15% 17.6 122 122 340 1 : 2.125 : 2.125 : 1.75 1.15 12 V, 1.6 A 71
POE72PR-12ED 72 100±15% 38 27 27 120 1 : 0.583 : 0.583 :0.50 0.25 12 V, 3.0 A 71
1 Packaging: D = 13" machine-ready reel
EIA 481 embossed plastic tape (150 parts per full reel). Quantities less than full reel available: in tape (not machine ready) or with leader and trailer ($25 charge).
2 Inductance is for the primary, measured at 200 kHz, 0.1 Vrms, 0 Adc
3 DC current at 25°C that causes an inductance drop of < 10% from its value without current
4 Leakage inductance measured between pins 1 and 3 with all other pins shorted
5 Output is for each secondary. Output of the aux winding is 10 V, 50 mA
6 Based on 280 mT at 25°C and number of turns on pins 1 – 3 A
7 Ambient temperature range: −40°C to +125°C
8 Storage temperature range: Component: −40°C to +165°C
Tape and reel packaging: −40°C to +80°C
9 Resistance to soldering heat: Max three reflows at +260°C for 40 seconds, allowing parts to cool to room temperature between cycles.
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: January 15, 2019