STMicroelectronics TDA7801H

Overview

TDA7801H from STMicroelectronics is a BCD6-technology quad bridge Class-D audio power amplifier with integrated 110 dB D/A conversion, I²S digital input (44.1–192 kHz sampling), and full I²C diagnostics for automotive infotainment systems. It delivers 4×28 W into 4 Ω at 14.4 V (10% THD) and features MOSFET outputs, independent channel short-circuit protection, and linear thermal warnings.

For engineers reviewing the TDA7801H datasheet, TDA7801H pinout, TDA7801H application, or TDA7801H equivalent, key selection criteria include its Flexiwatt27 horizontal package compatibility, dual-mode I²C/legacy operation, speaker-level DC/AC load detection, and configurable gain (four levels) for low-noise line-out functionality.

Technical Context

The TDA7801H implements a fully balanced transresistance output stage per channel using BCD6 process technology, enabling co-integration of high-resolution D/A conversion (115 dB S/N) and robust MOSFET power stages. Its diagnostic architecture supports real-time per-channel fault reporting-including open-load, short-to-rail, clipping, and thermal events-via dedicated I²C registers and an open-drain CD/DIAG pin.

It operates in three configurable modes: amplifier (full output), tristate (outputs disabled), and standby (minimal quiescent current). The PLL-filter/ENABLE pin serves dual roles: loop filter capacitor connection and global enable control, while I²C address selection (two options) and 8-channel TDM support are exclusive to PowerSO36-not applicable to TDA7801H's Flexiwatt27 package.

Key Specifications

Pinout & Package

Package: Flexiwatt27 (horizontal), thermally enhanced through-tab GND mounting, suitable for surface-mount assembly with vertical heat dissipation orientation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-channel automotive audio amplifier applications.

Compared with TDA7801PD, TDA7801H offers lower assembly cost and simpler thermal design for manual or semi-automated assembly, while TDA7802 provides measurable THD+N and sampling rate improvements at higher BOM cost-making TDA7801H optimal for cost-sensitive mid-tier automotive audio platforms.

Availability

TDA7801H is available at Aetrix Electronics and suitable for automotive infotainment head units, aftermarket stereo modules, and commercial vehicle entertainment systems requiring stable component supply across multi-year production cycles.

Supply support for TDA7801H includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in automotive, industrial, and power management ICs with broad AEC-Q100-qualified product portfolios.

The TDA7801H belongs to ST's TDA7xxx automotive audio amplifier family, designed specifically for cost-effective, diagnostics-rich, quad-channel amplification in entry-to-mid-tier car radios and head units.

FAQ

What is the maximum junction temperature and thermal resistance (R_thJA) for TDA7801H in Flexiwatt27 horizontal package?

The TDA7801H has a maximum junction temperature of 150 °C. For the Flexiwatt27 horizontal package, the typical junction-to-ambient thermal resistance (R_thJA) is 45 °C/W with a 200 cm² 2-oz copper heatsink area. This value assumes standard PCB layout per ST's AN4501 guidelines-reduced R_thJA is achievable with enhanced copper pour and thermal vias under the tab.

Does TDA7801H support I²S data alignment modes other than standard MSB-first, left-justified format?

No. The TDA7801H accepts only standard I²S format (MSB-first, left-justified, WS high for left channel) as defined in Section 7.2 of the datasheet. It does not support right-justified, DSP, or PCM modes. TDM operation is supported but requires specific SD1_3/SD2_4 timing and is functionally distinct from alternate I²S alignments.

Can the CD/DIAG pin be used to trigger an interrupt on a microcontroller without external components?

Yes-the CD/DIAG pin is an open-drain output with internal 20 kΩ pull-down. To interface with a 3.3 V microcontroller GPIO configured as interrupt input, connect a 4.7 kΩ external pull-up to 3.3 V. The pin asserts low on any fault event (clipping, thermal warning, short-circuit, or POR), and debouncing must be handled in firmware due to transient pulse durations as short as 10 µs.

Is the "legacy mode" electrically identical to I²C mode, or does it disable diagnostic functionality?

Legacy mode disables I²C communication and diagnostic register access entirely. In this mode, the I2C Data (Pin 26) acts as active-low mute, and I2C Clock (Pin 27) acts as active-high enable. All diagnostics-including CD/DIAG pin reporting-are retained, but configuration (gain, soft-mute, etc.) becomes static and fixed at power-on defaults.