TDA7385

Overview

The TDA7385 is an AB class audio power amplifier designed for high-end car radio applications. It features a fully complementary PNP/NPN configuration enabling rail-to-rail output voltage swing without bootstrap capacitors. The device delivers up to 4 x 42 W at 4 Ω maximum, or 4 x 23 W at 4 Ω with 14.4 V supply and 10% THD. It operates within an 8 V to 18 V supply range and includes an internal fixed gain of 26 dB. Packaged in Flexiwatt 25, it integrates clipping detection, mute/standby functions, and comprehensive fault diagnostics.

Feature Summary

• Rail-to-rail output capability using a fully complementary PNP/NPN configuration that eliminates the need for external bootstrap capacitors.
• Integrated on-board clipping detector to simplify gain compression operations during high-power audio reproduction.
• Comprehensive fault diagnostics facility capable of detecting output shorts to ground or supply, reversed battery conditions, and thermal shutdown events.
• Low external component count design featuring internally fixed gain and no requirement for external compensation networks.

Applications

• High-end automotive radio systems
• Quad bridge car audio amplification
• Automotive infotainment audio processing

Procurement Notes

Verify the specific suffix when ordering, as E-TDA7385 denotes an ECOPACK compliant variant while standard TDA7385 may lack this environmental certification. Confirm package orientation requirements, as Flexiwatt 25 packages are available in horizontal and vertical configurations. Ensure compatibility with existing PCB layouts due to potential differences in pinout orientation between variants. Check current production status, as original TDA7385 units may be discontinued in favor of updated versions.

Selection Notes

Select this component for designs requiring high output power with minimal external passive components. The absence of bootstrap capacitors simplifies board layout and reduces bill of materials cost. Verify that the application supports the required 14.4 V nominal automotive supply voltage. Consider the integrated protection features if system reliability against wiring errors or load dump events is critical. Ensure thermal management solutions accommodate the Flexiwatt 25 package characteristics.

Part Context

The TDA7385 belongs to STMicroelectronics' portfolio of Class-AB automotive audio amplifiers. It is engineered specifically for demanding car radio environments where high fidelity and robustness are required. The device represents a solution for quad bridge configurations, offering significant power output in a compact form factor suitable for modern vehicle interior constraints.

Replacement Considerations

E-TDA7385 serves as a direct replacement, primarily differing by ECOPACK compliance. TDA7388 and TDA7388A are listed as similar alternatives within the same product family, offering comparable quad bridge capabilities for automotive radio applications.