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JA4249-CLD

更新时间： 2022-02-26 12:17:32
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Forward Mode Transformers

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JA4249-CLD 数据手册

  
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)  
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 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 (mOhms)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  
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.  
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.  
Packaging: D = 13″ machine 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.  
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 12/16/11  
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. 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.  
1

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