Coilcraft JA4429 Flyback Transformer for Linear Technology LT3799 Isolated LED Controller
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Flyback Transformer for
Linear Technology LT3799

  • Developed for Linear Technology for use with the LT3799 Isolated LED Controller with active power factor correction
  • Mounted on LT3799 Demo Board
  • Universal input; 24 Watt output
  • Isolation: 3000 Vrms, one minute primary to secondary; 500 Vrms primary to bias, tested for one minute
  • RoHS-compliant. 260°C compatible. Tin-silver over tin over nickel over phos bronze terminations.


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 ratio Ipk2
pri sec bias pri : secpri : bias
JA4429-AL 400 320 0.252 0.126 0.149 7.5 1 : 0.24 1 : 0.24 1.3 24 V, 1 A
1 Inductance measured at 100 kHz, 0.1 Vrms, 0 Adc
2 Ipk is peak primary current drawn at minimum input voltage.
3 DCR measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
4 Leakage inductance is for the primary and is measured with the secondary shorted.
5 Output is for the secondary. Bias winding output is 24 V, 20 mA.
6 Ambient temperature range: −40°C to +85°C
7 Storage temperature range: Component: −40°C to +85°C
Packaging tray: −40°C to +80°C
8 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.
9 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: April 16, 2018