STMicroelectronics TDA7561H

Overview

TDA7561H from STMicroelectronics is a quad-channel Class-AB automotive audio power amplifier in Flexiwatt25 (horizontal) package, implementing DMOS output stages and full I²C-controlled diagnostics. It delivers 4 × 25 W into 4 Ω at 14.4 V/1 kHz/10% THD, supports selectable 26 dB or 12 dB gain, and integrates independent short-circuit protection per channel for car radio head units.

For engineers reviewing the TDA7561H datasheet, TDA7561H pinout, TDA7561H application, or TDA7561H equivalent, key selection criteria include its diagnostic-enabled fault reporting via I²C, dual-gain configuration for line-out compatibility, DC offset detection (±2 V threshold), and thermal shutdown with R_th(j-case) ≤ 1 °C/W.

Technical Context

The TDA7561H operates as a bridge-tied load (BTL) quad amplifier using Multipower BCD process and DMOS power transistors, enabling low-distortion audio output (0.02–0.05% THD at 12 dB gain) and high efficiency across 8–18 V supply range. Its I²C interface supports dynamic configuration of mute, standby, soft-play, and gain selection without external logic.

Diagnostics are implemented in two modes: turn-on pulse-based detection (short-to-GND/Vs, open/shorted speaker) and permanent real-time monitoring with 100 ms acquisition window. Fault status-including clipping, DC offset (>±2 V), and four independent short-circuit flags-is reported digitally over I²C, eliminating need for discrete sense circuitry.

Key Specifications

Pinout & Package

Package: Flexiwatt25 (horizontal), 25-pin single-in-line (SIL) thermally enhanced power package with exposed metal tab for heatsink attachment.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad automotive amplifier applications.

Compared with TDA7561H, the vertical TDA7561 offers identical functionality in a mechanically distinct package, while TDA7562H increases output capability and ESD robustness at the cost of higher thermal design complexity.

Availability

TDA7561H is available at Aetrix Electronics and suitable for automotive head units, aftermarket stereo receivers, commercial vehicle audio systems, and marine audio distribution requiring stable component supply across extended temperature and lifecycle demands.

Supply support for TDA7561H 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, mixed-signal, and power ICs for automotive, industrial, and consumer markets.

The TDA7561H belongs to ST's automotive audio amplifier product line, engineered specifically for cost-sensitive, high-reliability car radio applications requiring integrated diagnostics and flexible I²C configurability.

FAQ

What is the maximum safe operating temperature for the TDA7561H?

The TDA7561H has a maximum junction temperature of 150 °C and a thermal resistance of ≤1 °C/W from junction to case. To maintain reliability, the case temperature must remain ≤70 °C under full load, requiring a heatsink with thermal resistance ≤0.5 °C/W when dissipating 85 W. Ambient temperature must not exceed 85 °C in sealed enclosures.

How does the I²C diagnostic reporting work during normal operation?

The TDA7561H performs permanent diagnostics every 1 ms in restart mode or initiates a 100 ms full diagnostic cycle upon detecting overload. Fault data-including short-to-GND/Vs, open load, clipping, and DC offset-are stored in dedicated I²C registers (e.g., DB1–DB4) and readable by the host MCU without interrupting audio playback or requiring hardware polling lines.

Can the TDA7561H drive 2 Ω speakers safely?

Yes-the TDA7561H is rated for 4 × 60 W into 2 Ω loads at 14.4 V with 10% THD. However, continuous operation at this level requires strict thermal management: heatsink surface temperature must stay ≤70 °C, and supply voltage must remain ≥12 V to prevent current limiting. Derating to 45 W/channel is recommended for sustained 2 Ω use.

What is the purpose of the 12 dB gain mode beyond line output?

The 12 dB gain mode reduces input sensitivity and output noise (EIN2 = 12–20 µV), making it ideal not only for line-out but also for driving high-impedance loads like active crossovers or DSP inputs. It lowers THD to 0.02% typ. and improves PSRR by 10 dB versus 26 dB mode, enhancing immunity to supply ripple in noisy automotive environments.