STMicroelectronics TDA7265A

Overview

TDA7265A from STMicroelectronics is a Class AB dual-channel audio power amplifier in Multiwatt11 package, delivering 25 + 25W into 8Ω loads at ±20V supply with 10% THD. It integrates mute and standby functions referenced to +VS, features pop-free turn-on/off, short-circuit and thermal overload protection, and targets Hi-Fi music centers and stereo TV sets.

For engineers reviewing the TDA7265A datasheet, TDA7265A pinout, TDA7265A application, or TDA7265A equivalent, key selection criteria include split/single-supply operation (±5V to ±25V), mute/standby threshold voltages (VS−6V and VS−2.5V), quiescent current (80–130 mA), thermal shutdown at 145°C, and bridge-mode capability up to 50W.

Technical Context

The TDA7265A implements dual independent Class AB output stages with internally limited peak output current (4.5 A) and junction-to-case thermal resistance of 2°C/W. Its mute and standby logic uses a single pin (Pin 5) with three voltage thresholds relative to +VS, enabling discrete control states without external logic.

It supports both split-supply (±VS) and single-supply (0V/VS) configurations, with input offset voltage ≤ ±20 mV, open-loop gain of 80 dB, and slew rate of 10 V/µs - ensuring low distortion (<0.7% THD across 100 Hz–15 kHz at 1–15 W) and stable frequency response up to 100 kHz.

Key Specifications

Pinout & Package

Package: Multiwatt11 (vertical, 11-pin, metal tab thermally connected to Pin 6 / −VS). Mounting requires heatsinking due to R_{th j-case} = 2°C/W and P_tot = 30 W at T_case = 70°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TDA7265A, TDA7297 offers superior efficiency and lower distortion but demands more external components and loses analog-compatible mute control; LM4766 delivers higher power and linearity but requires full discrete protection design and increases BOM count and layout complexity.

Availability

TDA7265A is available at Aetrix Electronics and suitable for home audio receivers, stereo TV sets, and desktop speaker systems requiring stable component supply, long-lifecycle availability, and consistent thermal performance across production batches.

Supply support for TDA7265A 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, designing and manufacturing analog, mixed-signal, power, and microcontroller solutions for automotive, industrial, and consumer markets.

The TDA7265A belongs to ST's audio power amplifier product line, engineered specifically for cost-effective, thermally robust stereo amplification in space-constrained consumer electronics with integrated protection and analog control interfaces.

FAQ

What supply voltage range is supported by the TDA7265A?

The TDA7265A operates from ±5 V to ±25 V DC supply rails. Absolute maximum rating is ±25 V, but recommended operating range is ±16 V to ±22.5 V for optimal power output and thermal margin. At ±20 V, it delivers 25 W per channel into 8 Ω with 10% THD. Single-supply operation is also supported using 0 V and +VS, with appropriate DC-blocking capacitors.

How does the MUTE/ST-BY pin (Pin 5) function?

Pin 5 controls three operational states referenced to +VS: Play mode when voltage < VS−6 V; Mute mode between VS−6 V and VS−2.5 V; Standby mode when > VS−2.5 V. In standby, quiescent current drops to 3 mA and output stages disable. The thresholds are internally generated and do not require external resistors - compatible with simple open-collector or microcontroller GPIO interfacing.

Can the TDA7265A be used in bridge-tied-load (BTL) configuration?

Yes - the TDA7265A supports BTL operation by configuring one channel as inverting and the other as non-inverting, driving a single 8 Ω load. At ±16 V supply, it delivers up to 50 W at 10% THD. Thermal limits require reduced supply voltage (≤±16 V) for 8 Ω loads; higher impedances (e.g., 16 Ω) allow full ±25 V operation. Output power and dissipation must be recalculated per BTL equations.

What protection features are built into the TDA7265A?

The TDA7265A integrates short-circuit protection (across Out/GND, Out/+VS, and Out/−VS), thermal overload shutdown at 145°C junction temperature, and internal current limiting (4.5 A peak). It also features pop-free turn-on/off circuitry that suppresses output transients. No external protection components are required for standard speaker loads, though proper PCB layout and heatsinking remain essential for reliability.