STMicroelectronics TDA7802PDTR

Overview

TDA7802PDTR from STMicroelectronics is a quad-channel Class-AB digital-input audio power amplifier in PowerSO36 package, delivering 4 × 28 W into 4 Ω at 14.4 V with 110 dB A-weighted dynamic range, 24-bit resolution, and built-in diagnostics including DC/AC load detection and independent front/rear clipping detection - deployed in automotive infotainment head units requiring start-stop battery compatibility.

For engineers reviewing the TDA7802PDTR datasheet, TDA7802PDTR pinout, TDA7802PDTR application, or TDA7802PDTR equivalent, key selection criteria include I²C-configurable gain modes, 6–14.4 V supply operation, 44.1–192 kHz sample rate support, flexible serial port (I²S/TDM), and AEC-Q100 Rev G qualification for automotive thermal and reliability validation.

Technical Context

The TDA7802 integrates a full 24-bit D/A converter, programmable PLL locking to 50×Fs or 64×Fs, and four fully balanced MOSFET output stages with independent channel thermal protection. Its SB-I high-efficiency architecture reduces average dissipation by up to 50% versus conventional Class AB under real-world music signals.

Digital diagnostics are communicated via I²C bus, supporting per-channel speaker status reporting (open/short, thermal warning, DC offset), while hardware control mode (no I²C) and dedicated UNMUTEhw pin enable simplified integration in cost-sensitive designs.

Key Specifications

Pinout & Package

PowerSO36 package features exposed thermal slug on underside for direct PCB heatsinking; 36-pin SMD footprint with dual VCC12/VCC34 supplies and dedicated PWGND pins per channel to minimize ground bounce.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TDA7801TR and MAX9879ETN+, the TDA7802PDTR uniquely combines AEC-Q100 Rev G compliance, 1 Ω driving, per-channel diagnostics, and start-stop operation - making it the only option qualified for safety-critical automotive cabin audio where thermal margin and fault visibility are mandatory.

Availability

TDA7802PDTR is available at Aetrix Electronics and suitable for automotive infotainment head units, aftermarket cabin audio systems, and commercial vehicle entertainment platforms requiring stable component supply, long lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for TDA7802PDTR 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, designing and manufacturing microcontrollers, power ICs, sensors, and analog chips for automotive, industrial, and consumer markets.

The TDA7802 belongs to ST's automotive audio power amplifier product line, engineered specifically for high-fidelity, thermally efficient, and diagnostics-rich cabin audio systems in start-stop vehicles.

FAQ

What is the minimum operating voltage for TDA7802PDTR in start-stop applications?

The TDA7802PDTR operates continuously from 6 V to 14.4 V, enabling uninterrupted audio playback during engine cranking and idle-stop cycles. Its internal regulation and SB-I efficiency architecture maintain stable output power and low distortion across this range without external brownout protection circuitry.

Does TDA7802PDTR require an external PLL loop filter?

Yes - Pin 11 (PLLen) is a dedicated PLL loop filter connection point requiring an external RC network (typically 10 kΩ + 1 nF) to stabilize the internal programmable PLL that locks to 50×Fs or 64×Fs input clocks. Omission causes unstable sampling clock generation and audible artifacts.

Can TDA7802PDTR drive 2 Ω speakers in all channels simultaneously?

Yes - the PowerSO36 variant supports 4 × 72 W into 2 Ω at 14.4 V (THD = 10%), enabled by its 1 Ω driving capability per channel. This requires strict adherence to thermal layout guidelines: 400 mm² copper pour per VCC plane, ≥0.5 mm thermal vias under the slug, and forced airflow >0.5 m/s.

How does the CDdiag pin report individual channel faults?

CDdiag is an open-drain wire-OR output that pulls low on any active fault: overcurrent (per channel), thermal warning, POR, or DC offset. Fault source is identified only via I²C register reads (e.g., DIAG_CH1_STATUS); the pin itself provides system-level interrupt signaling without channel discrimination.