STMicroelectronics TDA7491HVU13TR

Overview

TDA7491HVU13TR from STMicroelectronics is a dual-channel BTL Class-D audio amplifier IC designed for LCD TV and monitor audio systems. It delivers 20 W + 20 W continuous output into 8 Ω at 10% THD with 18 V supply, operates from a single 5–18 V rail, achieves 90% efficiency, features four fixed gain settings (20/26/30/32 dB), and integrates differential inputs and thermal/short-circuit protection.

For engineers reviewing the TDA7491HVU13TR datasheet, TDA7491HVU13TR pinout, TDA7491HVU13TR application, or TDA7491HVU13TR equivalent, this page provides verified electrical specs, EPU package layout, real-world performance curves (THD, PSRR, FFT), mode control logic (STBY/MUTE), and direct substitution guidance for TV audio power stage design.

Technical Context

The TDA7491HVU13TR implements a dual-channel, fully differential-input Class-D architecture with internal PWM generation (290–350 kHz switching frequency), integrated 3.3 V regulators for signal and power stages (VDDS, VDDPW), and open-drain diagnostic output (DIAG) for fault reporting. Its exposed-pad-up (EPU) PowerSSO-36 package enables direct PCB thermal coupling without external heatsink.

It supports external clock synchronization via SYNCLK pin, uses ROSC to set master oscillator frequency, and provides four discrete closed-loop gain options via GAIN0/GAIN1 digital inputs-enabling precise system-level sensitivity tuning without external feedback networks.

Key Specifications

Pinout & Package

Package: PowerSSO-36 exposed pad up (EPU), thermally enhanced for direct PCB copper connection; requires soldering of exposed pad to ground plane for optimal thermal performance (R_{th j-case} = 2–3 °C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel Class-D audio amplifier applications.

Compared with TDA7491HV13TR, the EPU variant offers superior top-side thermal transfer for convection-cooled layouts; versus TDA7491LPTR, it delivers 33% higher output power headroom and extended 18 V operation essential for universal TV power compatibility.

Availability

TDA7491HVU13TR is available at Aetrix Electronics and suitable for LCD TV audio subsystems, monitor integrated speaker systems, and digital signage media players requiring stable component supply, long-term lifecycle support, and consistent thermal performance across production batches.

Supply support for TDA7491HVU13TR 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 consumer ICs with strong analog and power portfolio depth.

The TDA7491HV series belongs to ST's high-efficiency audio power amplifier product line, engineered specifically for space-constrained, thermally demanding display applications where integration, reliability, and acoustic quality are co-optimized.

FAQ

What is the minimum recommended LC filter for 8 Ω loads?

The datasheet specifies a 33 µH inductor and 220 nF capacitor for 8 Ω loads at 18 V supply. This filter suppresses PWM carrier (290–350 kHz) while preserving audio bandwidth (20 Hz–20 kHz) and minimizing EMI radiation. Component tolerances must be ±10% for inductance and ±20% for capacitance to maintain THD <0.1% and stability.

How does the DIAG pin behave during thermal overload?

During thermal overload (T_j ≥ 150 °C), the DIAG pin pulls low in open-drain configuration and remains asserted until junction temperature drops below 140 °C hysteresis threshold. It also activates for overcurrent (I_OUT > 5 A) and undervoltage (V_CC < 4.5 V), enabling unified fault detection without additional monitoring circuitry.

Can GAIN0 and GAIN1 be left floating?

No - GAIN0 and GAIN1 must be actively driven to defined logic levels (0 V or >2.3 V) to ensure deterministic gain selection. Floating inputs may cause metastability, erratic gain behavior, or increased noise due to undefined internal biasing; tie unused configurations to VSS or SVCC via 10 kΩ resistors per datasheet recommendation.

Is external clock synchronization mandatory for stable operation?

No - the internal oscillator (set by ROSC resistor) provides fully autonomous operation. SYNCLK is optional and used only when synchronizing multiple amplifiers or aligning PWM edges with system video timing to avoid audible heterodyne artifacts in multi-display installations.