TDA7494

Overview

The TDA7494 is a Class AB power amplifier designed for high-quality sound and TV applications. It operates on a single supply ranging from 11V to 35V, delivering up to 10W output power into an 8Ω load at THD=10% with a 28V supply. The device features integrated DC volume control, three switchable voltage-controlled input pins, and stand-by/mute functions. It includes short-circuit protection, thermal overload protection, and soft clipping capabilities.

Feature Summary

• Integrated linear volume control with DC coupling
• Three switchable voltage-controlled input selection pins
• Built-in mute and stand-by functions for noise reduction
• Short-circuit and thermal overload protection mechanisms

Applications

• High-fidelity audio amplification systems
• Television internal audio processing
• Active speaker configurations

Procurement Notes

Verify component authenticity through authorized STMicroelectronics distributors or certified partners. Confirm the Multiwatt-15 package integrity and pin alignment before installation. Check datasheet revisions for any updates to absolute maximum ratings or electrical characteristics. Ensure proper thermal management solutions are implemented given the package's thermal resistance specifications.

Selection Notes

Select this component for designs requiring integrated volume control and input switching within a single IC. Consider the 11V to 35V single-supply operation range for compatibility with standard TV power rails. Evaluate the need for external Boucherot cells, which are not required for stable operation in most cases. Assess thermal dissipation requirements based on the expected output power and ambient temperature conditions.

Part Context

This part belongs to the TDA74xx series of audio amplifiers by STMicroelectronics. It utilizes Multipower Bi50II technology. The device is specifically engineered for consumer electronics where space efficiency and integrated control features are prioritized over discrete component implementations.

Replacement Considerations

No direct public substitute part numbers are confirmed in the provided documentation. Designers should evaluate functional equivalents that match the Multiwatt-15 footprint and Class AB architecture if sourcing becomes unavailable due to obsolescence.

FAQ

Is a Boucherot cell required for stable operation?

No, the TDA7494 does not require a Boucherot cell for stable operation under normal conditions.

How is input selection managed?

Input selection is managed via three switchable voltage-controlled input pins (IN 1, IN 2, IN 3) controlled by specific voltage levels.