TDA7389A

Overview

The TDA7389A is an obsolete AB class audio power amplifier designed for high-end car radio applications. It features a Flexiwatt27 package and utilizes a fully complementary PNP/NPN configuration to enable rail-to-rail output voltage swing without bootstrap capacitors. The device provides four bridge channels with a maximum output power of 4 x 45 W at 4 Ω, or 4 x 28 W at 14.4 V supply. Key electrical parameters include a typical quiescent current of 350 mA, a fixed internal gain of 26 dB, and a maximum power dissipation of 80 W at a case temperature of 70°C.

Feature Summary

• Integrated diagnostic capabilities including clipping detection, offset detection, and thermal shutdown monitoring.
• Comprehensive protection mechanisms covering output short circuits, inductive loads, reversed battery polarity, and load dump voltages.
• Low external component count achieved through internally fixed gain and elimination of external compensation requirements.

Applications

• High-end automotive radio systems
• Quad bridge car audio amplification
• AB class audio power amplification

Procurement Notes

Verify the obsolete status of this component before initiating any design-in process. Confirm that the Flexiwatt27 vertical package dimensions align with existing board layouts. Ensure that alternative components are identified to support long-term production viability given the discontinuation status.

Selection Notes

Select this component only if the specific Flexiwatt27 footprint is mandatory for the application. Verify that the system can accommodate the required 22 µF minimum SVR capacitor value for optimal pop performance. Confirm that the input stage compatibility with ground-compatible signals meets the source interface requirements.

Part Context

This part belongs to the TDA7389 series of quad bridge amplifiers from STMicroelectronics. It shares functional similarities with the TDA7388 but utilizes a distinct Flexiwatt27 package instead of the Flexiwatt25. The device is engineered specifically for automotive environments requiring robust protection against harsh electrical conditions.

Replacement Considerations

Public confirmed substitute part numbers: None available.