STMicroelectronics TDA7563B

Overview

TDA7563B from STMicroelectronics is a quad-channel Class SB (high-efficiency) car audio power amplifier in Flexiwatt27 and PowerSO36 packages, delivering up to 4 × 50 W into 4 Ω at 14.4 V with 10% THD, featuring integrated I²C diagnostics, independent front/rear soft mute/play control, selectable 30 dB / 16 dB gain, and DC/AC load detection for automotive head units.

For engineers reviewing the TDA7563B datasheet, TDA7563B pinout, TDA7563B application, or TDA7563B equivalent, this device supports real-time speaker fault reporting via I²C, thermal foldback with linear shutdown, clipping detection with programmable 2%/10% thresholds, and dual-mode operation (power amplifier or line driver), making it critical for robust, service-aware infotainment systems.

Technical Context

The TDA7563B implements a DMOS-based quad bridge output stage using Multipower BCD technology, enabling high efficiency (Class SB) with up to 50% lower dissipation than conventional Class AB under average listening conditions. Its internal diagnostics engine performs turn-on and permanent AC/DC load analysis per channel via subsonic current pulses and voltage threshold comparisons.

I²C interface supports full digital control: standby/mute sequencing, gain selection, high-efficiency mode enable/disable, and read-back of fault status (short-to-GND/Vs, open/shorted speaker, clipping). Each channel features independent short-circuit protection, DC offset detection, and thermal warning with fast muting.

Key Specifications

Pinout & Package

Available in Flexiwatt27 (vertical/horizontal) and PowerSO36 (slug-up) packages. Thermal resistance junction-to-case is 1 °C/W for both packages, enabling high-power operation with minimal thermal derating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TDA7563B, TDA7561 sacrifices diagnostics and flexibility for lower cost, while TPA5560-Q1 trades integrated analog fault sensing for higher peak efficiency and digital control-making TDA7563B optimal when embedded diagnostics and analog robustness are mandatory.

Availability

TDA7563B is available at Aetrix Electronics and suitable for automotive infotainment systems, commercial vehicle audio platforms, and marine entertainment systems requiring stable component supply, long-lifecycle support, and production-grade qualification.

Supply support for TDA7563B 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, specializing in automotive, industrial, and power management ICs with AEC-Q100 qualified product lines.

The TDA7563B belongs to ST's TDA7xxx automotive audio amplifier family, engineered specifically for high-reliability, diagnostics-enabled car radio applications with emphasis on thermal resilience and I²C-integrated system monitoring.

FAQ

What package variants are available for the TDA7563B?

The TDA7563B is offered in three mechanical variants: Flexiwatt27 vertical (TDA7563B), Flexiwatt27 horizontal (TDA7563BH), and PowerSO36 slug-up (TDA7563BPD). All share identical electrical specifications and thermal resistance (1 °C/W junction-to-case), but differ in mounting orientation and PCB footprint compatibility.

How does the I²C diagnostics function detect an open speaker?

The TDA7563B applies a subsonic current pulse during turn-on or permanent diagnostics and measures resulting voltage thresholds. For open-load detection in power amplifier mode, it identifies loads >130 Ω; in line-driver mode, the threshold is >400 Ω. These values are stored and readable via I²C register DB1–DB4 without interrupting audio playback.

Can the TDA7563B operate in both Class AB and Class SB modes?

No-TDA7563B uses a proprietary Class SB architecture optimized for high efficiency (up to 75% at 4 Ω, 1 kHz), not a switchable AB/SB mode. Its "STD" and "HI-EFF" labels refer to internal bias configurations within Class SB, both delivering superior efficiency over traditional Class AB while maintaining low THD.

What is the maximum safe operating temperature for continuous 4 × 50 W output?

At 4 × 50 W into 4 Ω with 14.4 V supply, junction temperature must remain ≤150 °C. With R_{th j-case} = 1 °C/W and case temperature held ≤70 °C (via heatsink), the device sustains full output continuously. Derating begins above 70 °C case temperature per Figure 28's thermal foldback curve.