STMicroelectronics TDA7492ETR

Overview

TDA7492ETR from STMicroelectronics is a dual-channel Class-D audio amplifier in PowerSSO-36 EPU package, delivering up to 79 W + 79 W into 4 Ω at 26 V supply with 10% THD, featuring differential inputs, four fixed-gain settings (20.8–32.8 dB), and integrated PLIMIT-based output power limiting for speaker protection. It operates across 7–26 V single supply and supports stereo BTL or mono PBTL configurations in home audio systems.

For engineers reviewing the TDA7492ETR datasheet, TDA7492ETR pinout, TDA7492ETR application, or TDA7492ETR equivalent, key selection considerations include output configuration flexibility (2×BTL vs. 1×PBTL), thermal shutdown behavior at 140–150 °C, gain-setting via analog voltage on GAIN pin, and diagnostic open-drain output on DIAG pin for fault reporting.

Technical Context

The TDA7492ETR implements two identical Class-D PWM amplifier channels with internal oscillator (500 kHz typical, adjustable via ROSC pin), gate drivers, and analog input stages with differential topology to suppress common-mode noise. Each channel includes independent power-stage ground (PGNDA/PGNDB) and supply rails (PVCCA/PVCCB), enabling true dual BTL operation or parallel mono mode by reconfiguring INPB/INNB to VDDS.

Smart protection logic integrates overcurrent detection (11.2 A high-side threshold), thermal shutdown (140 °C mute, 150 °C power-off), and programmable output voltage limiting via PLIMIT pin - where applied voltage linearly controls maximum duty cycle using an internal scaling law tied to VCC and load impedance.

Key Specifications

Pinout & Package

The TDA7492ETR is housed in a 36-pin PowerSSO package with exposed pad up (EPU), requiring PCB thermal pad connection to ground for heatsinking. The exposed pad (EP) serves as primary thermal path and must be soldered to a large copper area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TAS5634PHDR and TPA3116D2PWPR, the TDA7492ETR uniquely combines high output power (79 W × 2), analog programmable power limiting, open-drain diagnostics, and differential inputs in a thermally optimized PowerSSO package - making it optimal for mid-tier home audio where integration, protection, and thermal simplicity are prioritized over ultra-low THD or lowest cost.

Availability

TDA7492ETR is available at Aetrix Electronics and suitable for home audio receivers, powered speakers, soundbars, and multi-zone distribution systems requiring stable component supply, consistent thermal performance, and long-term production continuity.

Supply support for TDA7492ETR 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, Switzerland, specializing in analog, power, microcontrollers, and automotive ICs with strong emphasis on energy efficiency and industrial reliability.

The TDA7492ETR belongs to ST's TDA7xxx family of high-efficiency Class-D audio amplifiers designed specifically for cost-sensitive yet performance-demanding consumer audio equipment operating from wide-range DC supplies.

FAQ

What is the minimum recommended LC filter configuration for TDA7492ETR?

The datasheet specifies 22 µH inductors and 1 µF film capacitors per channel for 6 Ω loads with 26 V supply and 500 kHz switching. Inductor DCR must be ≤ 150 mΩ to avoid excessive conduction loss, and capacitor voltage rating should exceed 35 V to handle rail transients. Layout must minimize loop area between OUTx pins, filter components, and PGND.

How does the PLIMIT function interact with speaker impedance?

PLIMIT sets a maximum effective output voltage based on VCC and load resistance - e.g., at 24 V supply and 4 Ω load, max PLIMIT voltage is 2.44 V. Exceeding this clamps duty cycle to prevent overvoltage stress on speakers. The relationship is defined by internal scaling: D_max ≈ 8.8 × V_PLIMIT, adjusted for R_load and power-stage losses.

Can TDA7492ETR drive 3 Ω speakers in stereo mode?

No - stereo BTL mode is rated only down to 4 Ω per channel. Driving 3 Ω loads risks overcurrent triggering due to higher peak currents. However, the device supports 3 Ω in mono PBTL mode (110 W), where both channels drive a single load in parallel - confirmed by Table 7 and Figure 3 in the datasheet.

What happens during simultaneous STBY and MUTE assertion?

When STBY is low (< 0.5 V) and MUTE is high (> 2.5 V), the device enters standby mode regardless of MUTE state - all internal blocks power down, quiescent current drops to 1 µA, and outputs float. MUTE only affects behavior when STBY is high; asserting STBY overrides MUTE functionality completely.