STMicroelectronics TDA7266M

Overview

TDA7266M from STMicroelectronics is a mono bridge audio power amplifier designed for TV and portable radio systems, delivering 7W into 8Ω at 11V supply with fixed 26dB closed-loop gain, THD ≤0.2% at 1W, and integrated standby/mute control. It operates from 3–18V, requires no bootstrap, SWR, or Boucherot capacitors, and features thermal overload and short-circuit protection.

For engineers reviewing the TDA7266M datasheet, TDA7266M pinout, TDA7266M application, or TDA7266M equivalent, key selection criteria include its wide supply range (3–18V), internally fixed gain architecture, dual independent control inputs (ST-BY and MUTE), low external component count, and Multiwatt15 package thermal performance.

Technical Context

The TDA7266M implements a Class AB bridge-tied load (BTL) output stage with internal biasing and current limiting, enabling single-supply operation without output coupling capacitors. Its ST-BY and MUTE pins accept independent TTL/CMOS-compatible logic thresholds (1.3V typical for ST-BY, 2.9V for MUTE), with exponential RC turn-on sequencing to suppress pop-noise.

Thermal protection activates at 150°C junction temperature (TW), and supply rejection is 56dB at 100Hz. The device uses BiCMOS BI20II process technology and integrates input resistance (25–30kΩ), output offset voltage (≤120mV), and quiescent current (65mA typ. at 11V).

Key Specifications

Pinout & Package

Package: Multiwatt15 (vertical, 15-pin, thermally enhanced plastic power package with integral heat slug; case-to-ambient Rth ≈ 40°C/W on 25cm² 2oz Cu).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar mono bridge audio amplifier applications.

Compared with TDA7265 and TPA3110D2, the TDA7266M offers optimal balance of simplicity (no external passive network), robustness (Class AB thermal behavior), and supply flexibility (3–18V), making it ideal for cost-sensitive, space-constrained consumer audio where 7W suffices.

Availability

TDA7266M is available at Aetrix Electronics and suitable for TV audio subsystems, portable radio front-ends, set-top box audio outputs, and compact home audio docks requiring stable component supply and long-term industrial availability.

Supply support for TDA7266M 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, MCU, power, and sensor solutions for automotive, industrial, and consumer markets.

The TDA7266M belongs to ST's legacy audio power amplifier product line, engineered specifically for cost-effective, low-component-count mono audio amplification in space- and power-constrained consumer electronics.

FAQ

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

The TDA7266M requires ≥25 cm² of 2-ounce copper connected to PW-GND and VCC pads for reliable operation at full 7W output in still air. Layout must include thermal vias under the exposed slug (pins 8/9) to inner ground planes. Without this, junction temperature exceeds 150°C above 4W output at 25°C ambient.

Can ST-BY and MUTE be tied together for simplified control?

Yes - STMicroelectronics' Application Note AN2117 confirms tying ST-BY and MUTE together via a resistor divider (e.g., 47kΩ + 10µF RC) enables single-wire control in low-cost designs. This configuration delays both functions identically, suppressing pop-noise during power cycling without microcontroller involvement.

Does the TDA7266M support differential input signals?

No - the TDA7266M has a single-ended IN1 input referenced to S-GND. It does not accept true differential (balanced) inputs. For noise-immune operation, use shielded cable routing and keep IN1 traces short and adjacent to S-GND; common-mode rejection is not specified and should not be assumed.

What is the maximum safe continuous output power into 4Ω?

At VCC = 11V, the TDA7266M delivers 12W into 4Ω at THD = 10%, but thermal limits constrain continuous operation to ≤5W due to 33W max Ptot and Rth j-case = 1.4°C/W. Sustained >5W into 4Ω requires forced airflow or heatsink attachment to prevent thermal shutdown.