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Document 824
Forward Mode Transformers ForTexasInstruments
TPS23756 PoE Interface
• Developed for the TI 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, one minute isolation, primary and bias to secondary
Core material Ferrite
Terminations  RoHS tin-silver (96.5/3.5) over tin over nickel over phos
bronze. Other terminations available at additional cost.
Weight  12.1 – 13.1 g
Ambient temperature  –40°C to +125°C
Storage temperature  Component: –40°C to +125°C.
Tape and reel packaging: –40°C to +80°C
Resistance to soldering heat  Max three 40 second reflows at
+260°C, parts cooled to room temperature between cycles
Moisture Sensitivity Level (MSL)  1 (unlimited floor life at <30°C /
85% relative humidity)
Mean Time Between Failures (MTBF) / Failures in Time (FIT)
26,315,789 hours / 38 per billion hours, Calculated per Telcordia SR-322
Packaging 175 per 13reel  Plastic tape: 44 mm wide, 0.4 mm thick,
32 mm pocket spacing, 11.9 mm pocket depth
PCB washing  Tested with pure water or alcohol only. For other solvents,
see Doc787_PCB_Washing.pdf.
Part Ind uctance2     DCR m ax (mOh ms)3 inLdeuacktaagnec e4  voInltpaugte 5  Tu rns ratio6
number1
min (µH)
pri sec bias max (µH) range (V) pri : sec   pri : biasOutput7
JA4249-CL_
JA4667-AL_
90
0.0180 0.015 0.320
0.120
10 – 57
1 : 0.80
1 : 1.9   5 V, 5 A
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 a packaging code:
JA4667-ALD
Packaging: D = 13machine 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 measured at 250 kHz, 0.2 Vrms, 0 Adc.
0.028
0,70
1
0.118
3,00
6
Dot indicates pin 1
0.827
21,0
0.430
10,92
max
12 0.118
3,00
0.810
20,57
max
0.050
1,27
7
0.130
3,3
Parts manufactured prior
to December 2011 may
be marked differently.
1
3. DCR for the secondary is measured with the windings connected in
parallel.
4. Leakage inductance is for the primary and is measured with the
secondary 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. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
12
Recommended
Land Pattern
0.930
23,62
17
28
Primary
Secondary
4 12
3 11
5
Bias
6
Primary windings and secondary windings
to be connected in parallel on PC board.
0.969
24,6
1.181
30,00
max
0.004 / 0,10
Dimensions are in
inches
mm
US +1-847-639-6400 sales@coilcraft.com
UK +44-1236-730595 sales@coilcraft-europe.com
Taiwan +886-2-2264 3646 sales@coilcraft.com.tw
China +86-21-6218 8074 sales@coilcraft.com.cn
Singapore + 65-6484 8412 sales@coilcraft.com.sg
Document 824  Revised 12/16/11
© Coilcraft Inc. 2013
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.