STMicroelectronics TDA7265

Overview

TDA7265 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 stand-by functions controlled via Pin 5, features pop-free turn-on/off, thermal shutdown at 145°C, and short-circuit protection. Designed for Hi-Fi music centers and stereo TV sets.

For engineers reviewing the TDA7265 datasheet, TDA7265 pinout, TDA7265 application, or TDA7265 equivalent, key selection criteria include split/single-supply operation (±5V to ±25V), 60 dB mute attenuation, 110 dB stand-by attenuation, 80–130 mA quiescent current, and thermal resistance of 2°C/W junction-to-case.

Technical Context

The TDA7265 employs complementary bipolar output stages with internal current limiting and thermal foldback. Its dual-channel architecture operates independently under split supply (±VS) or single-ended configuration using external biasing, supporting both stereo and bridge-tied-load (BTL) modes up to 50W at ±16V/8Ω.

Mute and stand-by are implemented via a single pin (Pin 5) referenced to +VS, with three distinct voltage thresholds: ≥+VS−2.5V (stand-by), +VS−6V to +VS−2.5V (mute), and ≤+VS−6V (play). Input offset voltage is ±20 mV, and open-loop gain is 80 dB.

Key Specifications

Pinout & Package

Package: Multiwatt11 (vertical, 11-pin, tab connected to Pin 6/−VS), TO-220 compatible footprint with integrated heat slug for direct heatsink mounting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TDA7265, TDA7293 offers higher power and bandwidth at the cost of complexity and thermal management overhead, while LM1875 provides basic amplification at lower cost and integration level but lacks system-level features like integrated muting and supply-flexible operation.

Availability

TDA7265 is available at Aetrix Electronics and suitable for Hi-Fi music centers, stereo television sets, and home audio docking stations requiring stable component supply and long-term industrial availability.

Supply support for TDA7265 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, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.

The TDA7265 belongs to ST's audio power amplifier product line, engineered specifically for cost-effective, high-fidelity stereo audio systems requiring integrated protection, low-noise performance, and flexible supply operation.

FAQ

What supply configurations does the TDA7265 support?

The TDA7265 supports both split-supply (±VS) and single-supply operation. In split mode, it uses +VS and −VS rails with GND as reference; in single-supply mode, −VS is tied to GND and input signals are DC-biased to mid-rail. The datasheet Figure 2 shows a verified single-supply schematic with BSX33 transistor-based level shifting.

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

Pin 5 voltage is referenced to +VS: ≥+VS−2.5V activates stand-by (3 mA IQ), +VS−6V to +VS−2.5V enables mute (60–70 dB attenuation), and ≤+VS−6V enables play mode. This three-state control eliminates need for external logic or voltage translators in system power management.

Can the TDA7265 be used in bridge-tied-load (BTL) configuration?

Yes - Pins 9 (OUT(L)) and 10 (OUT(R)) can be driven in anti-phase to drive a single 8Ω load with up to 50W output at ±16V. ST specifies derating to ±16V maximum for 8Ω BTL to limit dissipation; higher loads (e.g., 16Ω) allow full ±25V operation per the bridge application note on page 8.

What thermal management is required for continuous 25W/channel operation?

At 25W/channel into 8Ω with ±20V supply, junction temperature rise is ~60°C above case. With R_{th j-case} = 2°C/W, a heatsink with ≤1.5°C/W thermal resistance (including interface paste and mounting hardware) is required to maintain T_j ≤ 85°C ambient. PCB copper pour alone is insufficient for sustained output.