WA8515 Forward Mode Transformer | Coilcraft
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Forward Mode Transformer
for 25 Watt Applications

  • Developed for Texas Instruments TPS23754 PWM Controller
  • Designed for forward topology operating at 250 kHz
  • Input voltage range: 20 – 57 V, excellent for PoE applications
  • 1500 Vrms one minute isolation primary and bias to secondary
  • Secondary winding output: 5 V, 4.8 A
  • RoHS-compliant. 260°C compatible. Tin-silver-copper over tin over nickel over phos bronze terminations


Part number
Click to get parts
min (µH)
DCR max (mOhms)2 Leakage
max (µH)
range (V)
Turns ratio4 Output5
pri sec bias pri : sec pri : bias
WA8515-ALD 90 146 25 494 0.816 20 − 57 1 : 0.406 1 : 0.813 5.0 V, 4.8 A
1 Inductance measured at 250 kHz, 0.1 Vrms, 0 Adc.
2 DCR for the secondary is measured with the windings connected in parallel. For other operating temperatures, use this DCR at Temperature calculator.
3 Leakage inductance is for the primary and is measured with the secondary shorted.
4 Turns ratio is with the secondary windings connected in parallel. 
5 Output is with the secondary windings connected in parallel. Bias winding output is 12 V, 20 mA.
6 Ambient temperature range: −40°C to +85°C
7 Maximum part temperature: +125°C (ambient + temperature rise)
8 Storage temperature range: Component: −40°C to +125°C
Tape and reel packaging: −40°C to +80°C
9 Resistance to soldering heat: Max three 40 second reflows at +260°C allowing parts to cool to room temperature between cycles.
10 Electrical specifications at 25°C.
Refer to Soldering Coilcraft Components before soldering.
PCB washing: Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.

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Updated: November 08, 2018