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Cx Family Common Mode Chokes
0402CT Low Profile Chip Inductors
XAL7050 High-inductance Shielded Power Inductors
XGL4020 Ultra-low DCR Power Inductors

HA4000-AL Planar Transformer

for Texas Instruments LM5027

RoHS compliant
  • 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.

Buy Now:
Count Unit price
1 $7.32
1000 $7.10
5000 $6.46

For high volume or non-stock items, request a quote.

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Typical Application

Works with Texas Instruments LM5027

Input Voltage Output 1 Power Fsw
Sec Aux
36 V 78 V 3.3 V , 30 A 10 V , 0.07 A 99 W 200 kHz


Electrical specifications at 25°C.

Part number 2
(Hover for schematics)
min (µH) 3
DCR max (mΩ) 4 Leakage
max (µH) 5
Turns Ratio Isolation
Voltage (Vrms) 6
Pri Sec1 Aux Pri : Sec1 : Sec2 : Aux
HA4000-AL_ 270 56 0.5 294 0.6 1 : 0.083 : 0.083 : 0.583 1500
  1. Output is with the secondary windings connected in series. Bias winding output is 10 V, 65 mA.
  2. When ordering, please specify a packaging code: HA4000-ALD.
  3. Inductance is for the primary, measured across pins 2 and 4 at 200 kHz, 0.1 Vrms, 0 Adc.
  4. DCR for the primary is measured from pin 2 to pin 4. DCR for the secondary is for each winding.
  5. Leakage inductance is for the full primary and is measured with the secondary shorted.
  6. 1500 Vdc isolation, primary and auxiliary to secondaries.


  • RoHS-compliant. 260°C compatible. Matte tin over nickel over brass terminations.


  • D = 13″ machine ready reel. EIA-481 embossed plastic tape (200 parts per full reel). Quantities less than full reel available: in tape (not machine ready) or with leader and trailer ($25 charge).
  • B = Less than full reel. In an effort to simplify our part numbering system, Coilcraft is eliminating the need for multiple packaging codes. When ordering, simply change the last letter of your part number from B to D.
RoHS compliant
Ambient temperature range:
–40°C to +85°C
Storage temperature range:
Component: –40°C to +85°C.
Tape and reel packaging: –40°C to +80°C
Failures in Time (FIT) / Mean Time Between Failures (MTBF):



Physical characteristics



Tape and Reel specification

Parts per reel Reel dimensions (mm) Tape dimensions (mm) Orientation
13" (330 mm) A B C D E W P Po P1 H T part_or_v-(1).gif
200 330 100 13 50,4 44,4 44 32 4 2 9,35 0,37

General specification

Core Material:
11.9 g
200/13″ reel Plastic tape: 44 mm wide, 0.37 mm thick, 32 mm pocket spacing, 9.35 mm pocket depth


Moisture Sensitivity Level (MSL):
1 (unlimited floor life at <30°C / 85% relative humidity)
Resistance to soldering heat:
Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles
Refer to Soldering Coilcraft Components before soldering.
PCB Washing:
Only pure water or alcohol recommended

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