STMicroelectronics TDA7498TR

Overview

TDA7498TR from STMicroelectronics is a dual-channel BTL Class-D audio amplifier in PowerSSO-36 EPU package, delivering 100 W + 100 W into 6 Ω at THD = 10% and VCC = 36 V, with wide single-supply operation (14–39 V), 90% efficiency, and four selectable fixed gains (25.6–37.6 dB). It serves as the main power stage in active stereo speaker systems requiring high-output, low-heat, and noise-immune differential input architecture.

For engineers reviewing the TDA7498TR datasheet, TDA7498TR pinout, TDA7498TR application, or TDA7498TR equivalent, key selection considerations include its dual BTL output topology, exposed-pad thermal management, differential input rejection, synchronized multi-device clocking capability, and integrated protection logic for overvoltage, undervoltage, overcurrent, and thermal overload.

Technical Context

The TDA7498TR integrates two identical fully differential Class-D amplifier channels, each with independent PWM generation driven by an internal oscillator (290–330 kHz) or externally synchronized via SYNCLK. Its architecture uses BTL output stages with complementary high-side/low-side MOSFETs per channel, controlled by a feedback loop that sets closed-loop gain through resistor networks selected by GAIN0/GAIN1 pins.

It features dual regulated supplies: VDDPW (3.3 V for power stage) and VDDS (3.3 V for signal blocks), referenced to separate grounds (PGND and SGND), plus diagnostic open-drain output (DIAG) tied to all protection events. Thermal shutdown activates at 150 °C junction temperature, with mute mode triggered at 145 °C.

Key Specifications

Pinout & Package

Package: PowerSSO-36 EPU (exposed pad up), with thermal pad electrically connected to ground for direct heatsink mounting. Dimensions: 10.3 mm × 7.5 mm × 2.3 mm (typ.), R_{th j-case} = 2 °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 TPA3116D2PWP and MAX98357AETE+T, the TDA7498TR uniquely combines high output power (100 W × 2), differential analog inputs, hardware-configurable gain, and multi-unit clock synchronization - making it irreplaceable in high-fidelity, high-power active speaker and professional audio applications requiring noise resilience and thermal robustness.

Availability

TDA7498TR is available at Aetrix Electronics and suitable for active speaker systems, home theater receivers, professional stage monitors, and automotive aftermarket amplifiers requiring stable component supply, long-lifecycle support, and consistent thermal performance across ambient temperatures from –40 °C to +85 °C.

Supply support for TDA7498TR 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 sensors for industrial, automotive, and consumer markets.

The TDA7498TR belongs to ST's high-power audio amplifier product line, engineered specifically for compact, thermally efficient, and noise-immune Class-D solutions in active loudspeakers and premium home audio equipment.

FAQ

What is the minimum supply voltage required for full 100 W output capability?

The TDA7498TR achieves 100 W + 100 W into 6 Ω only at VCC ≥ 36 V, as specified in the datasheet's characterization curves. At lower voltages - e.g., 34 V - maximum output drops to 80 W + 80 W into 8 Ω. The absolute minimum operating voltage is 14 V, but usable output power falls below 10 W per channel below 24 V.

Can the TDA7498TR drive 4 Ω speakers safely?

Yes, but with derated output power and careful thermal design. The datasheet specifies safe operation down to 4 Ω with appropriate LC filter sizing and heatsinking. At VCC = 36 V and RL = 4 Ω, peak current reaches ~7 A (OCP threshold), limiting continuous output to ~120 W total. Derating by 20% and ensuring R_{th j-amb} ≤ 3.5 °C/W is recommended.

How does the DIAG pin behave during thermal overload?

During thermal overload (junction temperature ≥ 145 °C), the TDA7498TR first enters mute mode (50% duty cycle outputs, 70 dB attenuation) while keeping DIAG in high-impedance state. Only when Tj reaches 150 °C does OTP trigger full shutdown and pull DIAG high-Z - signaling a critical fault condition requiring system-level intervention or cooldown before restart.

Is external compensation required for stability with different LC filter configurations?

No external compensation is required. The TDA7498TR's internal feedback loop is designed for unconditional stability with standard second-order LC filters (e.g., 22 µH + 680 nF for 8 Ω). Stability is verified across 4–8 Ω loads and cutoff frequencies from 20–40 kHz. Layout adherence to ST's reference design - especially ground plane integrity and filter component placement - is essential.