SAGAMI’s Litz Wire Inductors for Class-D Audio Amplifiers

Critical for Audio Quality and Thermal Performance

Class-D amplifiers operate at switching frequencies of several hundred kHz. An LC low-pass filter at the output removes these switching components while allowing the audio signal to pass through to the speaker. The filter inductor therefore has a significant impact on both audio quality and the amplifier's thermal performance.

High-frequency ripple currents cause AC losses in both the core and winding. At the same time, magnetic stray fields can affect EMI performance and, consequently, overall system performance. These effects become increasingly significant as output power increases. Learn more about Power Inductors.

What Are the Benefits of Litz Wire in Class-D Output Filter Inductors?

The 7G23R series uses a winding made up of many thin, individually insulated strands. This distributes the high-frequency current across the entire conductor cross-section, keeping AC losses low at typical Class-D switching frequencies. The effect is clearly demonstrated by the 7G23R-100M 10uH: at no load, it generates about half as much heat as its predecessor, the 7G23G-100M. This reduces thermal stress and provides additional flexibility for compact layouts.

Typical applications include high-power audio amplifiers, AV receivers, and other Class-D designs where high output power, low heat generation, and excellent audio quality are required.

Key Features

• Litz wire winding for low AC losses
• Low-loss core material for high output power and clear, distortion-free sound
• Low magnetic stray field
• Low DC resistance for reduced conduction losses
• High current rating to handle demanding power stages
• Operating temperature range from -40°C to +125°C

Your Contact Person

For more information, please contact Sebastian Gebhart.