Document 824
For Texas Instruments
Forward Mode Transformers 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.
• 1500Vrms, one minute isolation, primaryandbias 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)
Packaging 175 per 13″ reel 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.
Leakage
inductance4
max (µH)
Input
DCR max (Ohms)3
pri sec bias
Turns ratio6
pri : sec pri : bias
Part
Inductance2
min (µH)
voltage5
range (V)
number1
Output7
JA4249-CL_
JA4667-AL_
90
90
0.0180 0.015 0.320
0.0175 0.047 0.320
0.120
0.085
10 – 57
10 – 57
1 : 0.80
1 : 1.9
1 : 1.9
1 : 1.9
5 V, 5 A
12 V, 2 A
2. Inductance is measured at 250 kHz, 0.2 Vrms, 0 Adc.
1. When ordering, please specify a packaging code:
JA4667-ALD
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.
Packaging: D = 13″ machine ready reel. EIA-481 embossed plastic
tape (175 parts per full reel). Quantities less than full
reel available: in tape (not machine ready) or with
leader and trailer ($25 charge).
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.
B = Less than full reel. In an effort to simplify our part
numbering system, Coilcraft is eliminating the need
for multiple packaging codes. When ordering, simply
change the last letter of your part number from B to D.
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.
Dot indicates pin 1
1
12
1
12
1
2
7
8
0.118
3,00
0.028
0,70
Primary
Secondary
0.810
20,57
Recommended
Land Pattern
max
0.050
1,27
0.118
3,00
4
3
12
11
7
5
Bias
6
6
0.130
3,3
0.930
23,62
0.827
21,0
Parts manufactured prior
to December 2011 may
be marked differently.
Primary windings and secondary windings
to be connected in parallel on PC board.
0.430
10,92
max
0.004 / 0,10
0.969
24,6
1.181
30,00
inches
mm
max
Dimensions are in
Document 824 Revised 09/26/19
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
© Coilcraft Inc. 2021
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.
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