TDA7801SMTR

Overview

The TDA7801SMTR is a quad bridge audio power amplifier from STMicroelectronics, designed for automotive applications using BCD technology. It integrates high-performance D/A conversion and MOSFET outputs to achieve an outstanding 115 dB signal-to-noise ratio with over 105 dB dynamic range. The device supports I2C, I2S, and TDM interfaces, allowing flexible configuration via the I2C bus. It operates within a supply voltage range of 8V to 18V and functions reliably in temperatures from -40°C to 105°C. Housed in a 27-Flexiwatt surface-mount package, it provides comprehensive diagnostics and protection features.

Feature Summary

• Integrated 110 dB D/A conversion and digital inputs (I2S/TDM) for high-fidelity audio performance.
• MOSFET output stage delivering up to 4x72 W into 2 Ω loads.
• Full I2C bus control for independent channel mute/play, gain selection, and digital diagnostics.
• Built-in diagnostic array including DC/AC load detection, clipping detection, and thermal warnings.

Applications

• Automotive car audio systems
• High-power car radios
• Digital input quad power amplification

Procurement Notes

Verify component authenticity as this part may be obsolete or subject to product change notices. Confirm the specific suffix matches the required package and reel specifications. Check current availability status through authorized distributors, as stock levels fluctuate. Ensure compatibility with existing PCB footprints for the 27-Flexiwatt SMD package before procurement.

Selection Notes

Select this model when digital audio inputs (I2S/TDM) are required alongside high power output. It is suitable for designs needing integrated D/A conversion to minimize external components. Consider the 27-Flexiwatt package for its thermal dissipation capabilities in compact automotive enclosures. Verify that the system architecture supports I2C configuration and diagnostic monitoring.

Part Context

The TDA7801SMTR belongs to the TDA7801 family of digital input quad power amplifiers. It shares core functionality with variants like TDA7801PD but differs in packaging. The SMTR suffix indicates a Tape & Reel (TR) format, optimized for automated surface-mount assembly processes compared to tube-packaged alternatives.

Replacement Considerations

Direct replacements include other TDA7801 variants such as TDA7801PD, though package differences must be accounted for. Cross-reference with TDA7802 if I2C-only interface suffices. Verify pinout and thermal requirements when substituting with similar STMicroelectronics automotive audio amplifiers.