KA5038-BL Flyback Transformer for ON Semi NCP1236 | Coilcraft
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Flyback Transformer for
ON NCP1236 PWM Controller

  • Developed for ON Semiconductor NCP1236 Fixed Frequency PWM Controller
    and NCP4305FBDAP 65W Off-Line AC/DC Adapter
  • Universal input; 66 Watt output
  • Isolation: 3000 Vrms, one minute primary to secondary
  • Copper shield minimizes EMI radiation
  • RoHS-compliant. 260°C compatible. Tin-silver over tin over copper over steel.


Part number
Click to get parts
L at 0 A1
±10% (µH)
L at Ipk2
min (µH)
DCR max (Ohms)3 Leakage
L max4
Turns ratio5 Ipk2
pri sec bias pri : sec pri : aux
KA5038-BL 560 480 0.198 0.007 0.236 5.6 1 : 0.188 1 : 0.156 2.8 19 V, 3.5 A
1 Inductance measured at 50 kHz, 0.1 Vrms, 0 Adc
2 Ipk is peak primary current drawn at minimum input voltage.
3 DCR is with the primary windings connected in series and the secondary windings connected in parallel. DCR measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
4 Leakage inductance is for both windings of the primary and is measured with the secondary windings shorted.
5 Turns ratios are with the primary windings connected in series and the secondary windings connected in parallel.
6 Output is for the secondary. Aux winding output is 15.5 V, 20 mA.
7 Ambient temperature range: −40°C to +85°C
8 Storage temperature range: Component: −40°C to +125°C
Packaging tray: −40°C to +80°C
9 Maximum part temperature: +125°C (Ambient + temperature rise)
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.
PCB washing: Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info

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Updated: February 08, 2019