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NA5730-AL Flyback Transformer

for TI TPS23751 and TPS23752 PoE Interface

RoHS compliant
  • Developed for Texas Instruments TPS23751 and TPS23752.

Buy Now:
Count Unit price
1 $4.17
175 $3.57
700 $3.11
1400 $2.63
2800 $2.25
5000 $2.06

For high volume or non-stock items, request a quote.

. in stock, ready to ship today.
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Typical Application

Works with Texas Instruments TPS23751/2

Input Voltage Output 1 Power Fsw
Sec Bias
33 V 57 V 5 V , 4.5 A 12 V , 0.02 A 22.5 W 250 kHz


Electrical specifications at 25°C.

Part number 2
(Hover for schematics)
at 0A (µH) 3
(Tolerance: ±10%)
min at   2.1 A (µH) 4
DCR max (Ω) 5 Leakage
max (µH) 6
Turns Ratio 7 Isolation
Voltage (Vrms) 8
Pri Sec Drive Bias Pri : Sec : Drive : Bias
NA5730-AL_ 62.0 55.8 0.107 0.004 0.060 0.122 2.0 1 : 0.125 : 0.125 : 0.29 1500
  1. Output of the secondary is with the windings connected in parallel. Bias winding output is 12 V, 20 mA. Drive winding output is 5 V, 10 mA.
  2. When ordering, please specify packaging code: e.g. NA5730LD
  3. Inductance is for the primary, measured at 250 kHz, 0.1 Vrms, 0 Adc
  4. Peak primary current drawn at minimum input voltage.
  5. DCR for the primary and the secondary is with windings connected in parallel. DCR measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
  6. Leakage inductance is for the primary, measured with the windings connected in parallel and with the secondary windings shorted.
  7. Turns ratio is with the primary windings and the secondary windings connected in parallel.
  8. 1500 Vrms, one minute isolation, primary and bias to secondary and drive.


  • RoHS-compliant  260°C compatible. Tin-silver-copper over tin over nickel over phos bronze terminations. Other terminations available at additional cost.


  • 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).
  • 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.
RoHS compliant
Ambient temperature range:
–40°C to +125°C
Storage temperature range:
Component: −40°C to +125°C
Tape and reel packaging: −40°C to +80°C
Failures in Time (FIT) / Mean Time Between Failures (MTBF):



Primary windings and secondary
windings to be connected
in parallel on the PC board

Physical characteristics



Tape and Reel specification


Parts per reel Reel dimensions (mm) Tape dimensions (mm) Orientation
13" (330 mm) A B C D E W P Po P1 H T
175 330 100 13 50,4 44,4 44 28 4 2 11,9 0,4

General specification

Core Material:
11.3 g
175 per 13″ reel Plastic tape: 44 mm wide, 0.4 mm thick, 28 mm pocket spacing, 11.9 mm pocket depth


Moisture Sensitivity Level (MSL):
1 (unlimited floor life at <30°C / 85% relative humidity)
Resistance to soldering heat:
Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles
Refer to Soldering Coilcraft Components before soldering.
PCB Washing:
Tested with pure water or alcohol only. More info.