TDA7803A-ZST

Overview

The STMicroelectronics TDA7803A-ZST is a high-efficiency digital input automotive quad power amplifier with built-in diagnostics, compatible with start-stop systems. It integrates a full D/A converter and powerful MOSFET output stages in advanced BCD technology. The device supports I2S or TDM digital inputs and features Class SBI operation for optimized efficiency. Key electrical parameters include a supply voltage range of 6 V to 18.5 V, an operating temperature range of -40°C to +105°C, and a dynamic range exceeding 110 dB. Output capabilities reach 4 x 27 W into 4 Ω loads at 14.4 V with 10% THD.

Feature Summary

• High Efficiency: Class SBI (SB-Improved) operation reduces dissipated output power by up to 50% compared to conventional Class AB solutions under average listening conditions.
• Digital Integration: Features a full D/A converter with 24-bit processing, supporting standard I2S and TDM formats (4Ch, 8Ch, 16Ch) with sample rates from 44.1 kHz to 192 kHz.
• Automotive Diagnostics: Includes comprehensive diagnostic functions via the I2C bus, such as DC/AC load detection, offset detection, clipping detection, and thermal protection.
• Start-Stop Compatibility: Designed to operate down to 6 V supply voltage, ensuring compatibility with modern vehicle battery profiles.

Applications

• Automotive audio systems requiring high efficiency and digital integration
• Vehicle infotainment systems with start-stop functionality
• Multi-channel speaker configurations (Front/Rear Left/Right)
• Applications requiring integrated diagnostic monitoring for reliability

Procurement Notes

Verify that the specific ordering suffix matches the required package type. The TDA7803A-ZSX variant uses PowerSO-36, while the TDA7803A-48X uses Flexiwatt-27. Confirm the package style (Surface Mount vs. Through Hole) aligns with the design requirements before procurement.

Selection Notes

Select the TDA7803A-ZST when a Surface Mount Device (SMD) solution in the PowerSO-36 package is required. Ensure the application supports the necessary I2S/TDM digital interface and I2C control bus. Verify that the PCB layout accommodates the exposed top pad for thermal management, given the high power dissipation capabilities.

Part Context

The TDA7803A series represents STMicroelectronics' approach to high-performance automotive audio amplification. It combines analog output stages with digital signal processing to reduce system complexity. The ZST suffix indicates the specific tape and reel packaging configuration for the PowerSO-36 surface mount variant within this product family.

Replacement Considerations

Direct replacements depend on the required package. For PowerSO-36 SMD, consider other TDA7803A variants with different suffixes if available. For Flexiwatt-27 packages, the TDA7803A-48X is the through-hole equivalent. Cross-referencing pinouts and thermal characteristics is essential when substituting.