Coilcraft DA2032, DA2033, DA2034 Flyback Transformers for Linear Technology LT3750 / LT3751
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Flyback Transformers for
Linear Technology LT3750 / LT3751

  • Designed for use with Linear Technology LT3750 Capacitor Charger Controller
  • Smaller footprint than other transformers for this application
  • For charging capacitors to 300 V
  • 3 – 24 V input
  • Shown on LT3750 application note for use in a 300 V, 3 A charging circuit (DA2032); a 300 V, 6 A charging circuit (DA2033); and a 300 V, 9 A charging circuit (DA2034)
  • 1500 Vrms primary to secondary isolation and 750 Vrms winding to core isolation, tested for one minute.
  • DA2033-AL and DA2034-AL are also specified for the LT3751 Controller.
  • RoHS-compliant. 260°C compatible. Tin-silver over tin over nickel over phos bronze terminations


Part number1
Click to get parts
L at 0A2
±10% (µH)
L at Ipk3
min (µH)
DCR max (Ohms) Leakage
max (µH)
Turns ratio
pri : sec
pri4 sec
DA2032-AL_ 10.0 9.0 0.013 1.60 0.150 1 : 10 67 3.0
DA2033-AL_ 10.0 9.0 0.015 1.10 0.144 1 : 10 76 5.0
DA2034-AL_ 10.0 9.0 0.018 1.75 0.250 1 : 10 128 10.0
1 When ordering, please specify packaging code: e.g. DA2034-ALD
  Packaging: D = 13" machine-ready reel
EIA 481 embossed plastic tape (DA2032-AL and DA2033-AL: 200 parts per full reel;
DA2034-AL: 175 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.
2 Inductance is for the primary, measured at 100 kHz, 0.1 Vrms, 0 Adc
3 Peak primary current drawn at minimum input voltage.
4 DCR is at 25°C with the primary windings connected in parallel. For other operating temperatures, use this DCR at Temperature calculator.
5 Leakage inductance is for the primary windings connected in parallel with the secondary windings shorted.
6 Capacitance measured at 100 kHz, 0.1 Vrms from pin 3 to pin 1 with all other pins shorted.
7 Ambient temperature range: −40°C to +125°C
8 Storage temperature range: Component: −40°C to +125°C
Tape and reel packaging: −40°C to +80°C
9 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.
10 Electrical specifications at 25°C.
Refer to Soldering Coilcraft Components before soldering.

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Updated: April 16, 2018