Coilcraft HA3648-BL Planar Transformer for Texas Instruments LM5037
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Planar Transformer for
Texas Instruments LM5037

  • Specifically developed for use with the TI LM5037 Dual Mode PWM Controller
  • Designed as half bridge in forward topology
  • Auxiliary winding provides 10 V to the chipset
  • 1500 Vdc isolation, primary to secondary
  • RoHS-compliant. 260°C compatible. Matte tin over nickel over brass terminations.


Part number1
Click to get parts
nom (V)
(A rms)
min (µH)
max (µH)
DCR max4
Turns ratio
pri : sec1 : sec2 : aux
HA3648-BL_ 50 5 10 30.0 0.040 4.8
2 : 1 : 1 : 2
1 When ordering, please specify packaging code: e.g. HA3648-BLD
  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 measured on an Agilent/HP 4284 across the primary at 250 kHz, 0.1 Vrms, 0 Adc.
3 Leakage inductance is for the primary, measured at 250 kHz, 0.1 Vrms, 0 Adc with secondary winding shorted.
4 DCR for the secondary is across both windings (from pin 6 to pin 10), measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
5 Ambient temperature range: −40°C to +85°C
6 Storage temperature range: Component: −40°C to +85°C
Tape and reel packaging: −40°C to +80°C
7 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.
8 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