TDA7803A-48X

Overview

The TDA7803A-48X is a single-chip quad bridge automotive power amplifier manufactured by STMicroelectronics. It utilizes advanced BCD technology to integrate a full D/A converter, digital inputs for I2S or TDM connections, and powerful MOSFET output stages. The device supports 24-bit digital processing with a dynamic range exceeding 110 dB and an S/N ratio of 115 dB. It operates within a supply voltage range of 6 V to 18.5 V and functions across temperatures from -40°C to +105°C. Packaged in a 27-Flexiwatt vertical through-hole configuration, it delivers up to 4 x 47 W into 2 Ω loads at 14.4 V.

Feature Summary

• High efficiency Class AB operation (SB-I) optimized for uncorrelated music signals, reducing dissipated output power by up to 50% compared to conventional solutions.
• Integrated full D/A converter enabling direct connection to I2S or TDM digital audio sources without external DACs.
• Comprehensive diagnostic array accessible via the I2C bus, including DC/AC load detection, offset detection, clipping detection, and thermal protection.
• Start-stop compatibility allowing operation down to 6 V supply voltage.

Applications

• Automotive front/rear/surround speaker amplification
• Digital car audio systems requiring high-efficiency Class AB performance
• Vehicle infotainment systems compatible with start-stop battery profiles

Procurement Notes

Verify that the specific ordering suffix matches the required package type. The TDA7803A-48X designation corresponds to the Flexiwatt-27 vertical through-hole package. Confirm AEC-Q101 qualification status if required by the specific application environment, as package variants may differ in automotive qualification levels.

Selection Notes

Select this component when a digital input interface is preferred over analog inputs to reduce system noise and complexity. Ensure the design accommodates the 27-Flexiwatt vertical package requirements for adequate thermal dissipation. Verify that the host microcontroller supports the required I2S/TDM frame formats and I2C control protocols.

Part Context

This part belongs to the TDA7803A series of high-efficiency digital input automotive quad power amplifiers. It is designed to replace traditional analog Class AB amplifiers in modern vehicle architectures by integrating signal processing directly on the chip. The series supports various packaging options, including PowerSO-36 and different Flexiwatt configurations, to suit diverse PCB layout constraints.

Replacement Considerations

Direct pin-compatible replacements include other TDA7803A variants such as TDA7803A-ZSX (PowerSO-36), though package differences require mechanical adaptation. Cross-referencing with TDA7808 is possible for evaluation purposes but requires schematic verification due to potential functional differences.