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
Photo 
Pricing 
Materials declaration
JA4249
JA4667 
PDF data sheet
SPECIFICATIONS
Dimensions
Schematic
Tape and reel specifications
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| 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, 5 A |
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| 1 | When ordering, please specify packaging code: e.g. JA4667-ALD | |
| Packaging: | 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. |
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| 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. | |
| 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 T&R 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. | ||