STMicroelectronics TDA7295

Overview

TDA7295 from STMicroelectronics is a monolithic Class AB audio power amplifier in Multiwatt15 package, designed for high-fidelity applications including home stereo systems, self-powered loudspeakers, and premium television audio stages. It delivers up to 80W music power into 4Ω or 8Ω loads with ±40V supply capability, integrated mute/standby control, and DMOS output stage enabling high current drive without secondary breakdown.

For engineers reviewing the TDA7295 datasheet, TDA7295 pinout, TDA7295 application, or TDA7295 equivalent, key selection considerations include its ±40V operating range, 70–90 dB stand-by attenuation, thermal shutdown at 145°C, and compatibility with bridge-tied load (BTL) configurations using dual devices.

Technical Context

The TDA7295 employs a DMOS-based unity-gain output buffer with local linearizing feedback and Miller compensation to minimize crossover distortion while maintaining wide bandwidth (20Hz–20kHz) and low THD (0.005% typ. at 1kHz). Its BCD 100 mixed bipolar-MOS process enables safe operation under reactive loads without second-breakdown limitations.

Protection architecture combines SOA monitoring with dynamic thermal sensing: it enters mute mode at 145°C junction temperature and full stand-by at 150°C. Mute and stand-by functions are CMOS-compatible, independently controlled, and optimized to eliminate switching transients-no Boucherot cells required under standard conditions.

Key Specifications

Pinout & Package

Package: Multiwatt15 (15-pin vertical SIP, 22.2 mm length, 4.55 mm width, 1.27 mm pitch), thermally enhanced with exposed metal tab for heatsink mounting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TDA7295, TDA7297 offers reduced voltage headroom and lower peak power but identical pinout and control interface; LM3886TF provides higher PSRR and lower noise floor but demands external mute logic and SOA protection circuitry - increasing BOM count and layout complexity.

Availability

TDA7295 is available at Aetrix Electronics and suitable for home stereo amplifiers, self-powered loudspeakers, premium television audio subsystems, and Hi-Fi subwoofer modules requiring stable component supply and long-term industrial availability.

Supply support for TDA7295 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, specializing in analog, power, and microcontroller solutions for industrial, automotive, and consumer markets.

The TDA7295 belongs to ST's high-voltage audio amplifier product line, engineered specifically for single-package, high-power Class AB performance in space- and thermal-constrained Hi-Fi and broadcast audio equipment.

FAQ

What is the maximum safe supply voltage for the TDA7295?

The absolute maximum supply voltage is ±40 V DC, as specified in the Absolute Maximum Ratings table. Operation beyond this level risks permanent damage to the DMOS output stage and internal bias circuitry. For reliable long-term use, ST recommends staying within ±36 V under worst-case thermal conditions, especially when driving low-impedance loads or operating at elevated ambient temperatures.

Does the TDA7295 require external Boucherot cells for stability?

No - the TDA7295 is designed for unconditional stability without Boucherot cells under standard conditions (VS ≥ ±25 V). The datasheet explicitly states they are "normally not necessary." Only in edge cases involving highly reactive loads and supply voltages below ±25 V should R6/C10 be added, per Figure 1 guidance.

How does the thermal protection sequence work?

At 145°C junction temperature, the device enters mute mode (60–80 dB attenuation) while remaining powered. At 150°C, it transitions fully into stand-by mode (70–90 dB attenuation, ~1–3 mA IQ). Both thresholds are monitored via on-die thermal sensors, and recovery is automatic once junction temperature falls below hysteresis thresholds (~140°C for mute, ~145°C for stand-by).

Can the TDA7295 be used in bridge-tied load (BTL) configuration?

Yes - the datasheet provides a validated dual-TDA7295 BTL schematic (Figure 18) delivering 100 W into 8 Ω at ±22 V. Critical requirements include matched supply decoupling, symmetrical PCB layout, and isolation of +PWVs/−PWVs rails between devices to prevent ground loop distortion and ensure balanced current sharing.