Würth Elektronik's online platform for simple component selection and performance simulation. Try REDEXPERT and calculate your losses in real-time.

Introduction & Tutorials

The most important features at a glance

  • The world’s most accurate AC loss model
  • Inductor simulation and selection for DC/DC converters
  • Ability to compare inductance/current and temperature rise/DC current using interactive measurement curves
  • Filter settings for over 20 electrical and mechanical parameters
  • Online platform based on measured values
  • Available in seven languages
  • No login required
  • Order free samples directly
  • Direct access to product datasheets

World‘s most accurate AC loss model

Inductor losses are one of the critical factors in the design of an efficient power supply. In REDEXPERT you can determine accurately your total AC losses at any operating condition, with our world’s most accurate AC loss model for Power Inductors, which incorporate the AC core and AC wire losses.

Measured in real DC/DC application

Switching Frequency: 10 kHz ... 10 MHz
Duty Cycle: 0.1... 0.9

Advantages of Würth Elektronik AC loss model

Model based on actual components

  • All types of core materials
  • All core shapes (not only ring cores)
  • Air gap and fringing effects
  • Effects and changes in winding structure

Point of operation

The Model was measured with a pulsating square wave voltage, which is applied across the inductor and results in a triangular current with DC offset.

Compared to Steinmetz (blue), the Würth Elektronik (red) model has a higher accuracy over a wider range of duty cycles.

Changeable ambient temperature and measurement conditions

Display inductance value dependent on ambient temperature

Temperature Rise vs. DC current chart considering ambient temperature

Impedance determination considering DC-Bias


Impedance / Frequency

Enter your desired attenuation and frequency and REDEXPERT will propose suitable ferrites and common mode chokes based on system model calculations.

Available applications

  • DC/DC converters
  • WPT resonance tank
  • Pulse designer
  • Attenuation designer

Advantages for registered users

  • Compare up to 16 products
  • Add up to 5 chart markers
  • Compare losses in the article table and filter for lowest loss or temperature rise
  • Use manual loss calculation independent of converter topology
  • Full access to all charts