TDA8425/V7,112

Overview

The TDA8425 is a monolithic bipolar integrated stereo sound circuit designed for hi-fi audio and television sound applications. It features digitally controlled functions via the I2C-bus, including source selection, volume, balance, bass, treble, and mute controls. The device supports linear, pseudo, spatial, and forced mono modes. Key electrical parameters include a supply voltage range of 10.8 V to 13.2 V, an input sensitivity of 300 mV for full power output, and a signal-to-noise ratio of 86 dB. Total harmonic distortion is typically 0.05%, with channel separation of 80 dB. It operates within a temperature range of 0°C to 70°C and is housed in a 20-DIP package.

Feature Summary

• I2C-bus digital control for volume, balance, bass, treble, and mute functions
• Multiple audio modes: linear stereo, pseudo stereo, spatial stereo, and forced mono
• Dual stereo channels with independent left/right volume control (±6 dB to -64 dB)
• Integrated power-on reset and bias generation

Applications

• Hi-fi audio systems
• Television sound processing
• Consumer audio equipment

Procurement Notes

Verify the manufacturer origin, as the part was originally produced by Philips Semiconductors. Confirm the package type is 20-DIP (SOT146-1) and check for RoHS compliance status if required for modern manufacturing standards. Ensure the operating voltage matches the 10.8 V to 13.2 V specification.

Selection Notes

Select this component for applications requiring I2C-controlled analog audio processing with stereo output. Ensure the system design provides a stable 12 V supply within the 10.8 V to 13.2 V range. Verify that the microcontroller interface supports standard I2C timing (up to 100 kHz). Consider the thermal dissipation capabilities given the 450 mW total power dissipation limit at temperatures up to 70°C.

Part Context

The TDA8425 is part of the NXP (formerly Philips) audio processor family. Similar parts include the TDA8421, TDA8424, and TDA8426, which offer comparable stereo audio processing functionalities with I2C interfaces. These components are designed for integration into consumer electronics requiring high-fidelity sound reproduction.

Replacement Considerations

Direct replacements may include TDA8421, TDA8424, or TDA8426 from NXP Semiconductors. Verify pin compatibility and software register mapping when substituting, as minor functional differences may exist between variants.