TDA7391

Overview

The TDA7391 is a bridge Class-AB audio power amplifier designed for high-power automotive radio applications. It delivers up to 40W into 4Ω or 45W into 3.2Ω loads. The device operates on a single supply voltage ranging from 8V to 18V. Key electrical parameters include a fixed internal gain of 30dB, an input bias current of 10µA, and a maximum output current of 6A. It supports both differential and single-ended input modes within a Multiwatt-11 package.

Feature Summary

• Features an exclusive fully complementary output stage that minimizes external component requirements by eliminating the need for bootstrap capacitors, Boucherot cells, and SVR capacitors.
• Includes an onboard clipping detector to facilitate the implementation of gain compression systems for audio protection.
• Provides comprehensive protection mechanisms including short circuit (to ground, supply, and across load), thermal overload, inductive load handling, load dump, open ground, and ESD protection.

Applications

• High-power car radio amplifiers
• Automotive audio boosters
• End-level car radio equipment

Procurement Notes

Verify component status as the TDA7391 is listed as Not Recommended for New Designs (NRND) or obsolete in certain distributor records. Confirm availability through authorized channels if replacement parts are required. Ensure compatibility with existing PCB layouts using the Multiwatt-11 package before finalizing procurement decisions.

Selection Notes

Select this component for designs requiring a single-channel mono bridge amplifier with high power output capabilities. It is suitable for applications needing differential or single-ended inputs without complex external biasing networks. Consider its AEC-Q100 qualification for automotive reliability standards when integrating into vehicle audio systems.

Part Context

The TDA7391 belongs to the STMicroelectronics TDA7391 series of automotive Class-AB audio power amplifiers. This series is engineered specifically for demanding automotive environments, offering robust performance and integrated protections. It serves as a solution for manufacturers seeking to reduce bill-of-materials complexity while maintaining high audio fidelity in vehicle infotainment systems.

Replacement Considerations

Check for direct substitutes within the TDA7391 family, such as the TDA7391LV for low-voltage operation or the TDA7391PD variant. Verify pinout and thermal characteristics match the original design constraints before implementing any alternative components.