STMicroelectronics TDA7564BPD

Overview

TDA7564BPD from STMicroelectronics is a quad-channel Class SB (high-efficiency) car audio power amplifier in PowerSO36 package, delivering up to 4×50 W into 4 Ω at 14.4 V with 10% THD, featuring integrated I²C diagnostics, independent channel muting/soft play, and DMOS output stage for low distortion. It serves as the main audio output stage in OEM automotive head units requiring fault-aware, thermally efficient amplification.

For engineers reviewing the TDA7564BPD datasheet, TDA7564BPD pinout, TDA7564BPD application, or TDA7564BPD equivalent, key selection criteria include its 4×50 W max output capability, I²C-based speaker load detection (open/short), thermal foldback behavior, and dual-mode gain configuration (12 dB / 26 dB) for line-out compatibility.

Technical Context

The TDA7564BPD implements a BCD-processed DMOS bridge output stage enabling Class SB operation-achieving up to 50% lower power dissipation than conventional Class AB under average listening conditions. Its internal diagnostic engine performs turn-on and permanent AC/DC load analysis per channel via subsonic current pulses and DC offset monitoring.

I²C interface supports real-time readback of four independent fault registers (short-to-GND, short-to-VS, open load, clipping), with programmable thresholds for load impedance (1.5–45 Ω normal range in amplifier mode) and DC offset (±2.5 V max). Thermal protection includes linear foldback and multiple warning levels before shutdown.

Key Specifications

Pinout & Package

Package: PowerSO36 (slug-up), thermally enhanced exposed die pad for direct PCB heat sinking. Pin count: 36 terminals, including 4× differential speaker outputs, dual supply rails (VCC1/VCC2), I²C bus (DATA/CLK), diagnostic control (CD_OUT), mute/standby inputs, and analog ground references (AC_GND, S_GND, PW_GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TDA7564BPD, TDA7561TR sacrifices diagnostics and channel count for lower cost and footprint, while STA559BW trades analog input versatility and DC fault awareness for higher channel count and digital-native operation-making TDA7564BPD optimal for analog-input, fault-aware 4-channel automotive designs.

Availability

TDA7564BPD is available at Aetrix Electronics and suitable for OEM automotive head units, aftermarket DSP integrations, commercial vehicle audio systems, and marine amplifier modules requiring stable component supply across extended temperature and voltage ranges.

Supply support for TDA7564BPD 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, power, and microcontroller solutions for automotive, industrial, and consumer markets.

The TDA7564BPD belongs to ST's TDA75xx automotive audio amplifier family, engineered specifically for high-reliability, thermally efficient, and diagnostics-rich infotainment systems in modern vehicles.

FAQ

What is the maximum safe operating junction temperature for TDA7564BPD?

The absolute maximum junction temperature is 150 °C, but thermal foldback begins linearly at 125 °C to reduce output power and prevent thermal runaway. The device maintains full functionality down to –55 °C, supporting deployment in extreme ambient environments such as engine bay proximity or unheated cargo compartments.

Does TDA7564BPD support independent gain control per channel?

No-gain is set globally via I²C register IB1 (bit D6), selecting either 12 dB or 26 dB for all four channels simultaneously. However, mute, soft-play, and standby functions are independently controllable per channel through separate I²C bits, enabling staggered channel activation and selective silence.

How does the turn-on diagnostic differ from permanent diagnostics?

Turn-on diagnostic runs once at power-up before amplifier biasing, using subsonic pulses to detect wiring faults (open/short) without audible output. Permanent diagnostics run continuously during playback, monitoring DC offset, clipping, and AC load impedance in real time-both report status via the same I²C register map but with distinct timing and trigger conditions.

Can TDA7564BPD drive 2 Ω loads continuously?

Yes-it delivers up to 4×72 W into 2 Ω at 14.4 V with 10% THD, but sustained operation requires strict thermal management: PCB copper area ≥ 1200 mm² under the PowerSO36 slug, ambient ≤ 60 °C, and airflow ≥ 1 m/s. Derating curves in Figure 7 confirm 60 W/channel is achievable with proper heatsinking.