TDA7389

Overview

The TDA7389 is a Class-AB audio power amplifier packaged in Flexiwatt 25, designed for high-end car radio applications. It features four bridge-connected channels delivering up to 45 W per channel into a 4 Ω load at maximum output, or 28 W per channel at 14.4 V supply with 10% THD. The device utilizes a fully complementary PNP/NPN output configuration enabling rail-to-rail voltage swing without bootstrap capacitors. Electrical characteristics include a typical voltage gain of 26 dB, low output noise, and integrated protections against short circuits, thermal overload, and reversed battery conditions.

Feature Summary

• Fully complementary PNP/NPN output configuration enables rail-to-rail output voltage swing without requiring external bootstrap capacitors.
• Integrated diagnostic facility detects output shorts to ground, shorts to the supply voltage, and thermal shutdown events.
• Includes clipping detector functionality alongside standby and mute control capabilities.
• Comprehensive protection suite covers output short circuits, very inductive loads, overtemperature with soft limiting, load dump voltage, fortuitous open ground, and reversed battery conditions.

Applications

• High-end car radio systems
• Automotive audio power amplification
• Quad bridge speaker driving

Procurement Notes

Verify component authenticity through authorized STMicroelectronics distributors or certified partners. Confirm package integrity upon receipt, as the Flexiwatt 25 housing requires careful handling during installation. Review the official datasheet for absolute maximum ratings and thermal management guidelines before integration. Ensure design compliance with automotive electrical standards regarding load dump and reverse polarity protection.

Selection Notes

Select this component for designs requiring high-power quad bridge amplification in automotive environments. The fixed internal gain of 26 dB simplifies input stage design by eliminating external compensation networks. Evaluate thermal dissipation requirements carefully, as the device supports significant power output within the Flexiwatt 25 package. Consider the automute feature for managing power states based on supply voltage levels.

Part Context

The TDA7389 belongs to STMicroelectronics' portfolio of AB-class audio power amplifiers tailored for automotive use. It shares architectural similarities with other models in the series but offers specific power outputs and protection features suited for premium vehicle audio systems. The product is currently listed as obsolete, indicating it has been superseded by newer generations in the manufacturer's lineup.

Replacement Considerations

Consult STMicroelectronics documentation for current active replacements within the TDA73xx series. Verify pin compatibility and thermal performance when transitioning from this obsolete part to newer alternatives.