STMicroelectronics TDA7564BH

Overview

TDA7564BH from STMicroelectronics is a quad-channel Class SB (high-efficiency) car audio power amplifier in Flexiwatt25 horizontal package, 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, selectable gain, and full fault protection including DC offset, clipping, and thermal monitoring.

For engineers reviewing the TDA7564BH datasheet, TDA7564BH pinout, TDA7564BH application, or TDA7564BH equivalent, this device supports automotive infotainment system design requiring real-time speaker load validation, thermal-aware high-power amplification, and I²C-configurable audio channel management under constrained board space and thermal budgets.

Technical Context

The TDA7564BH implements a DMOS-based BCD process output stage enabling Class SB operation - a proprietary ST architecture combining AB-linearity with SB-level efficiency - achieving up to 50% lower dissipation than conventional Class AB under average listening conditions. Its four independent bridge outputs support simultaneous 4 Ω or 2 Ω loads with per-channel short-circuit protection and thermal foldback.

Diagnostic functionality operates via dedicated I²C registers (IB1/IB2/DB1–DB4), enabling turn-on and permanent AC/DC load detection (open >85 Ω, short <0.5 Ω), clipping thresholds (1–15% THD), and offset voltage monitoring (±2.5 V). All diagnostics feed status flags readable over the same bus used for gain, mute, and efficiency mode control.

Key Specifications

Pinout & Package

Package: Flexiwatt25 (horizontal), thermally enhanced through-tab metal slug, 25-pin single-in-line (SIL) with vertical heat-sinking orientation optimized for PCB-mounted heatsinks.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TDA7564B (vertical) and TDA7564BPD (PowerSO36), the TDA7564BH offers identical electrical performance and diagnostics in a horizontally oriented Flexiwatt25 package - simplifying heatsink integration in low-profile dashboard layouts while maintaining full I²C configurability and fault reporting capability.

Availability

TDA7564BH is available at Aetrix Electronics and suitable for automotive head units, multi-zone cabin audio systems, aftermarket DSP integration modules, and commercial vehicle infotainment systems requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for TDA7564BH 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 automotive-grade analog, power, and microcontroller solutions with ISO/TS 16949-certified manufacturing.

The TDA7564BH belongs to ST's TDA75xx automotive audio amplifier family, engineered specifically for high-efficiency, diagnostics-enabled car radio applications where thermal density, speaker protection, and I²C system integration are primary design constraints.

FAQ

What is the maximum safe operating temperature for the TDA7564BH junction?

The absolute maximum junction temperature is 150 °C per Table 2 of the datasheet. However, thermal foldback begins at ~130 °C (linear shutdown), and sustained operation above 125 °C degrades long-term reliability. With R_{th j-case} = 1 °C/W and case temperature held ≤70 °C via heatsink, the device safely delivers 4×28 W continuously.

How does the I²C diagnostic system detect an open speaker load?

The TDA7564BH applies a subsonic test pulse during turn-on or permanent diagnostics and measures output voltage response. An open load (>85 Ω in amplifier mode) yields insufficient current flow, resulting in output voltage exceeding the P_nop window (1.8–V_S−1.8 V), triggering the open-load flag in DB1–DB4 registers.

Can the TDA7564BH operate with a single 12 V supply in automotive stop-start systems?

Yes - its 8–18 V operating range covers nominal 12 V, cranking dips (~6–8 V), and alternator surges (up to 18 V). Quiescent current remains stable down to 8 V, and the I²C interface functions reliably at V_CC ≥ 3 V, ensuring diagnostics remain active even during low-battery conditions.

Is the Flexiwatt25 horizontal package RoHS-compliant and lead-free?

Yes - the TDA7564BH is manufactured in ST's RoHS-compliant, lead-free Flexiwatt25 (horizontal) package per EU Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 3. The tab is matte tin-plated for solderability and meets IPC-J-STD-609A Class 1 marking requirements.