TDA7801

Audio Special Purpose Overview

The TDA7801 is a quad bridge power amplifier designed for automotive audio applications, utilizing BCD6 technology to integrate high-performance digital-to-analog conversion with MOSFET outputs. It supports I2S digital input with selectable sampling frequencies of 44.1 kHz, 48 kHz, 96 kHz, and 192 kHz. The device delivers up to 4x28 W into 4 Ω loads at 14.4 V and achieves an outstanding 115 dB signal-to-noise ratio with over 105 dB dynamic range. It features comprehensive I2C bus diagnostics, including DC/AC load detection and thermal warnings, ensuring robust system reliability in automotive environments.

Audio Special Purpose Feature Summary

• Integrated 110 dB D/A converter with I2S/TDM digital input
• High output power: 4x28 W @ 4 Ω (14.4 V) or 4x72 W @ 2 Ω
• Full I2C bus control with advanced diagnostic features
• Pop-free operation during battery transitions

Audio Special Purpose Applications

• Digital car audio head units
• Automotive sound systems requiring direct digital connection
• Vehicle infotainment amplifiers

Audio Special Purpose Procurement Notes

The TDA7801 is listed as obsolete by STMicroelectronics. Verification of availability should focus on remaining stock from authorized distributors or secondary market sources. Ensure the specific package variant matches the design requirements, as the part number may vary by packaging type such as PowerSO-36 or Flexiwatt.

Audio Special Purpose Selection Notes

Select this component for designs requiring integrated digital-to-analog conversion to eliminate external DACs. Verify compatibility with I2S/TDM interfaces and ensure the host controller supports the required I2C diagnostic protocols. Consider the thermal management capabilities of the chosen package, as the device provides linear thermal protection but requires adequate heat dissipation for high-power operation.

Audio Special Purpose Part Context

The TDA7801 belongs to STMicroelectronics' family of digital-input audio amplifiers aimed at simplifying car audio system architectures. By integrating the D/A converter on-chip, it reduces component count and improves noise immunity compared to analog-only solutions. It is part of a broader series that includes variants like the TDA7808 and TDA7802, which share similar functional blocks but differ in packaging and specific interface configurations.

Audio Special Purpose Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. As the TDA7801 is obsolete, engineers must evaluate alternative STMicroelectronics digital audio amplifiers or third-party equivalents based on pin compatibility, power output, and interface support.