Coilcraft HA4000-AL Planar Transformer for Texas Instruments LM5027
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Planar Transformer for
Texas Instruments LM5027

  • Developed for use with the TI LM5027 Voltage Mode Active Clamp Controller.
  • Chosen by NSC for T1 on the LM5027 Evaluation Board, and is described in Application Note AN‑1976.
  • Auxiliary winding provides 10 V to the chipset.
  • 1500 Vdc isolation, primary and auxiliary to secondaries
  • RoHS-compliant. 260°C compatible. Matte tin over nickel over brass terminations.


Part number1
Click for samples
min (µH)  
DCR max3
max (µH) 
range (V)
pri : sec1 : sec2 : aux
HA4000-AL_ 270 56
0.6 36 – 78 12 : 1 : 1 : 7 3.3 V, 30 A
1 When ordering, please specify packaging code: e.g. HA4000-ALD
  Packaging: D = 13" machine-ready reel
EIA 481 embossed plastic tape (200 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 across pins 2 and 4 at 200 kHz, 0.1 Vrms, 0 Adc.
3 DCR for the primary is measured from pin 2 to pin 4. DCR for the secondary is for each winding. DCR at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
4 Leakage inductance is for the full primary and is measured with the secondary shorted.
5 Output is with the secondary windings connected in series. Bias winding output is 10 V, 65 mA.
6 Ambient temperature range: −40°C to +85°C
7 Storage temperature range: Component: −40°C to +85°C
Tape and reel packaging: −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