E-TDA7404D

Audio Special Purpose Overview

The E-TDA7404D is an automotive-grade audio signal processor designed for car radio applications. It features a BiCMOS process for low distortion and noise, with fully integrated digital audio filters. The device supports four stereo inputs and one mono input, managed via an I2C bus interface. Key functions include programmable bass, treble, and loudness controls, soft-step volume adjustment, and direct/soft mute capabilities. It provides four independent speaker outputs and a subwoofer stereo output. Operating on a 7.5V to 10.5V supply, it is housed in a 28-SOIC package.

Audio Special Purpose Feature Summary

• Four stereo inputs (three single-ended, one pseudo-differential) and one differential mono input
• Programmable second-order Bass, Treble, and Loudness filters via I2C interface
• Soft-step volume control with programmable transition times to reduce audible clicks
• Direct mute and digitally controlled soft-mute with S-shaped slope characteristics

Audio Special Purpose Applications

• Car radio signal processing
• Automotive audio systems requiring digital filter programming
• Multi-zone audio distribution with independent speaker attenuation

Audio Special Purpose Procurement Notes

Verify component authenticity as the TDA7404 series is listed as obsolete by major distributors. Confirm RoHS compliance status through official STMicroelectronics documentation or authorized channels before procurement. Check for moisture sensitivity level (MSL 3) handling requirements during storage and assembly.

Audio Special Purpose Selection Notes

Select this component for applications requiring high channel separation (up to 100 dB) and low output noise (15 µV typ). Ensure the design accommodates the 7.5V to 10.5V supply voltage range and utilizes the I2C interface for all filter and gain configurations. Consider the SO-28 package dimensions for PCB layout constraints.

Audio Special Purpose Part Context

The E-TDA7404D belongs to the TDA7404 family of audio processors from STMicroelectronics. It is specifically engineered for automotive environments, offering robust performance against electrical noise and temperature variations (-40°C to +85°C). The 'E' prefix typically denotes specific packaging or qualification variants within the standard TDA7404 product line.

Audio Special Purpose Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. As the base model is marked obsolete, consult STMicroelectronics for current equivalent automotive audio processors.