STMicroelectronics TDA7266D13TR

Overview

TDA7266D13TR from STMicroelectronics is a dual-channel bridge-tied-load (BTL) audio power amplifier IC designed for compact stereo audio systems. It delivers 5W + 5W output into 8Ω loads at 9.5V supply with 10% THD, features internally fixed 26 dB gain, integrated stand-by/mute control, and operates from 3.5–12V single supply-used in LCD TV audio stages, PC motherboard sound outputs, and portable multimedia speakers.

For engineers reviewing the TDA7266D13TR datasheet, TDA7266D13TR pinout, TDA7266D13TR application, or TDA7266D13TR equivalent, key selection criteria include thermal resistance (15°C/W on recommended PCB), mute attenuation (≥60 dB), stand-by threshold (0.8–1.8 V), quiescent current (50–60 mA), and absence of external bootstrap/SVR capacitors.

Technical Context

The TDA7266D13TR employs a BiCMOS BTL architecture with internal biasing and fixed closed-loop gain, eliminating need for external gain-setting resistors or bootstrap networks. Its thermal protection activates at 150°C junction temperature, and short-circuit protection limits peak output current to 1.5 A.

Stand-by and mute functions are independently controlled via dedicated pins (Pin 9 and Pin 8), each with defined voltage thresholds and hysteresis. The device uses separate signal ground (S-GND) and power ground (PW-GND) routing to minimize THD+noise and prevent oscillation-critical for high-fidelity low-power audio playback.

Key Specifications

Pinout & Package

Package: PowerSO-20 (Slug Down), thermally enhanced surface-mount package with exposed copper slug for direct PCB heat transfer. Dimensions: 15.8 × 13.9 mm, 20-pin, lead-free compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual BTL audio amplifier applications.

Compared with TDA7266D13TR, TDA7265D offers higher power but increases BOM and layout complexity, while TPA3110D2 improves efficiency at the cost of EMI management overhead and larger solution size-making TDA7266D13TR optimal for cost-sensitive, space-constrained Class-AB stereo audio where simplicity and low noise are prioritized.

Availability

TDA7266D13TR is available at Aetrix Electronics and suitable for LCD TV audio subsystems, PC motherboard sound outputs, and portable multimedia speaker designs requiring stable component supply, consistent thermal performance, and long-term industrial availability.

Supply support for TDA7266D13TR 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, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.

The TDA7266D13TR belongs to ST's TDA audio amplifier product line, engineered specifically for cost-effective, low-EMI stereo audio amplification in space- and thermal-constrained consumer electronics-emphasizing integration, reliability, and ease of use.

FAQ

What is the minimum recommended PCB copper area and via count for thermal management?

The datasheet specifies a 3×3 cm ground copper area with 15 thermal vias (0.3 mm diameter) under the PowerSO-20 slug to achieve R_{th j-amb} = 15°C/W. This configuration supports up to 5W dissipation with ≤75°C temperature rise above 50°C ambient-verified in ST's AN668 application note and evaluation board layout.

Can TDA7266D13TR drive 4Ω speakers?

Yes, but with derated supply voltage: maximum VCC = 6.5 V for 4Ω loads to limit dissipated power to ≤5W and avoid thermal shutdown. At 6.5V/4Ω, output power is ~3.5W+3.5W at 10% THD. Exceeding this risks thermal protection activation during sustained output.

How should ST-BY and MUTE pins be sequenced to prevent pop noise?

At power-on: assert ST-BY first, wait 100–200 ms for internal bias stabilization, then de-assert MUTE. At power-off: assert MUTE first, then de-assert ST-BY. This sequence prevents capacitor charging transients from appearing at speaker terminals-confirmed in Figures 1 and 2 of the preliminary datasheet.

Is the TDA7266D13TR RoHS-compliant and halogen-free?

Yes-the PowerSO-20 package is lead-free and RoHS-compliant per STMicroelectronics' product change notice PCN 12-0127. Halogen content meets IEC 61249-2-21 standards (<900 ppm bromine/chlorine, <1500 ppm total halogens), verified in ST's material declaration report MD-00012487.