Coilcraft JA4249-CL, JA4667-AL Forward Mode Transformers for TI TPS23756
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Forward Mode Transformers
for TI TPS23756 PoE Interface

  • Developed for use with Texas Instruments TPS23756 High Power / High Efficiency PoE Interface and DC / DC Controller.
  • Designed for forward topology operating at 250 kHz with an extended input voltage range of 10 – 57 V.
  • 1500 Vrms isolation from primary and bias to secondary
  • 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
min (µH)
DCR max (mOhms)3 Leakage
max (µH)
range (V)
Turns ratio6 Output7
pri sec bias pri : sec pri : bias
JA4249-CL_ 90 0.0180 0.015 0.320 0.120 10 – 57 1 : 0.80 1 : 1.9 5 V, 5 A
JA4667-AL_ 90 0.0175 0.047 0.320 0.085 10 – 57 1 : 1.9 1 : 1.9 12 V, 2 A
1 When ordering, please specify packaging code: e.g. JA4667-ALD

D = 13" machine-ready reel
EIA 481 embossed plastic tape (170 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 DCR for the secondary is measured with the windings connected in parallel. DCR at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
4 Leakage inductance is for the primary winding with the secondary windings shorted.
5 Maximum duty cycle at minimum input voltage is 0.72.
6 Turns ratio is with the primary windings and secondary windings connected in parallel..
7 Output is with the secondary windings connected in parallel. Bias winding output is 12 V, 20 mA
8 Ambient temperature range: −40°C to +125°C
9 Storage temperature range: Component: −40°C to +125°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.

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Updated: April 30, 2018