STMicroelectronics TDA749213TR

Overview

TDA749213TR from STMicroelectronics is a dual-channel BTL Class-D audio amplifier IC designed for high-efficiency stereo output in space-constrained consumer displays. It delivers 50 W + 50 W continuous power into 6 Ω at 10% THD with 25 V supply, operates from 8–26 V single supply, achieves 90% efficiency, and supports four fixed gain settings (21.6–33.6 dB) - used in LCD TV audio subsystems requiring minimal heatsinking.

For engineers reviewing the TDA749213TR datasheet, TDA749213TR pinout, TDA749213TR application, or TDA749213TR equivalent, key selection considerations include differential input noise immunity, external clock synchronization capability, thermal overload protection behavior, and PowerSSO-36 EPU package thermal performance under sustained 40 W/channel load conditions.

Technical Context

The TDA749213TR integrates two identical Class-D PWM amplifier channels with independent differential inputs, internal 310 kHz oscillator (adjustable via ROSC), and open-drain diagnostic output (DIAG) signaling overtemperature, overcurrent, or undervoltage events. Each channel drives a BTL load using complementary high-side/low-side MOSFETs with 0.2 Ω R_DS(on).

It features dual regulated 3.3 V supplies: VDDPW powers the power stage, while VDDS powers signal blocks; both referenced to ground. Gain is set by GAIN0/GAIN1 logic inputs, and synchronization is supported via SYNCLK pin in master or slave mode - enabling multi-device timing alignment without external PLL.

Key Specifications

Pinout & Package

Package: PowerSSO-36 EPU (Exposed Pad Up), thermally enhanced surface-mount package with integrated heatsink interface; EP pad must be soldered to large copper area connected to PGND for thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TAS5756M and TPA3116D2, the TDA749213TR uniquely balances analog interface simplicity, differential noise rejection, and hardware-based synchronization - making it optimal for legacy-display audio systems prioritizing reliability over programmability.

Availability

TDA749213TR is available at Aetrix Electronics and suitable for LCD TV audio subsystems, commercial display audio modules, home theater soundbars, and digital signage players requiring stable component supply across multi-year production cycles.

Supply support for TDA749213TR 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, designing and manufacturing analog, mixed-signal, power, and microcontroller solutions for automotive, industrial, and consumer markets.

The TDA749213TR belongs to ST's high-efficiency audio amplifier product line, engineered specifically for flat-panel display manufacturers needing compact, thermally efficient, and noise-immune stereo amplification without digital complexity.

FAQ

What is the minimum recommended LC filter configuration for 8 Ω speakers?

For 8 Ω loads, ST specifies a 33 μH inductor and 220 nF capacitor as the standard LC filter (Figure 33). This configuration suppresses PWM carrier energy above 300 kHz while preserving audio bandwidth up to 20 kHz. Layout must minimize loop area between OUTx pins and filter components to reduce EMI radiation.

How does the DIAG pin behave during thermal overload?

During thermal overload, the DIAG pin pulls low (open-drain sink) and remains asserted until junction temperature falls below 140 °C hysteresis threshold. The pin also activates for overcurrent (4.8–6.0 A) and undervoltage (<7 V); it does not indicate which fault occurred - system firmware must correlate with STBY/MUTE state and supply monitoring.

Can GAIN0 and GAIN1 be left floating?

No - GAIN0 and GAIN1 must be actively driven to logic high or low; floating states result in undefined gain and potential instability. ST recommends connecting unused inputs to VDDS (for logic high) or SGND (for logic low) using 10 kΩ resistors to ensure deterministic operation across voltage and temperature.

Is the PowerSSO-36 EPU package lead-free and RoHS compliant?

Yes - the TDA749213TR uses an ECOPACK®-compliant PowerSSO-36 EPU package that is fully lead-free and RoHS compliant (Directive 2011/65/EU), with halogen-free molding compound and matte-tin lead finish meeting JEDEC J-STD-020 moisture sensitivity level 3 requirements.