STMicroelectronics STA369BWTR

Overview

STA369BWTR from STMicroelectronics is a 2.1-channel high-efficiency digital audio system-on-chip (SoC) integrating FFX® Class-D amplifier, DSP, and I²C-controlled audio processing. It delivers 2 × 15 W + 1 × 30 W into 2 × 4 Ω / 1 × 8 Ω at 22 V, supports 32–192 kHz I²S input, features dual-band DRC, 15 preset crossover filters, and operates from 5–26 V supply. It targets compact home theater soundbars and active subwoofer modules requiring integrated amplification and bass management.

For engineers reviewing the STA369BWTR datasheet, STA369BWTR pinout, STA369BWTR application, or STA369BWTR equivalent, key selection considerations include its ternary PWM output architecture, LFE-dedicated processing path with 0.125 dB resolution, thermal/short-circuit protection, PowerSSO-36 EPD package thermal performance, and compatibility with STA339BW/STA350BW for design reuse.

Technical Context

The STA369BWTR implements a fully integrated digital audio terminal with three independent PWM power stages: two binary-mode channels for stereo mid/high-frequency output and one ternary-mode channel optimized for low-frequency effects (LFE). Its internal 96 kHz DSP engine performs real-time EQ, dual-band DRC (B2DRC), and dedicated bass boosting using programmable biquad filters and coefficient banks.

It uses an I²S serial interface for digital audio input and I²C for configuration, supporting flexible channel mapping, soft-volume updates with programmable ramp ratio, automatic zero-detect and invalid-input mute, and AM interference suppression via selectable switching frequencies. The device embeds thermal overload and short-circuit protection with configurable recovery behavior.

Key Specifications

Pinout & Package

STA369BWTR is housed in PowerSSO-36 with exposed pad down (EPD), optimized for thermal dissipation in surface-mount audio amplifier applications. The 36-pin thermally enhanced package supports high-power density mounting on 2-layer PCBs with internal copper pour under the EPD.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 2.1-channel digital audio SoC applications.

Compared with STA339BW and STA350BW, the STA369BWTR uniquely combines high-power 2.1-channel FFX® amplification, dedicated LFE DSP, and video-sync-ready operation - making it the sole option among these three for thermally demanding, self-contained soundbar designs requiring factory-tuned bass response.

Availability

STA369BWTR is available at Aetrix Electronics and suitable for soundbar manufacturing, active subwoofer production, and entry-level home theater receiver development requiring stable component supply and long-term industrial availability.

Supply support for STA369BWTR 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 microcontrollers, power management, and analog/mixed-signal ICs for automotive, industrial, and consumer markets.

The STA369BWTR belongs to ST's Sound Terminal® family - engineered specifically for highly integrated, cost-optimized digital audio systems that replace multi-chip solutions with single-package amplification, processing, and protection.

FAQ

What thermal management is required for STA369BWTR in continuous 30 W LFE operation?

The PowerSSO-36 EPD package requires ≥200 cm² of 2-oz copper pour connected to the exposed pad via ≥8 thermal vias (0.3 mm diameter) for sustained 30 W LFE output at 22 V. Ambient temperature must remain ≤60 °C; thermal warning flag triggers at 145 °C junction temperature, with automatic shutdown at 160 °C.

Can STA369BWTR drive 3 Ω speakers in stereo mode?

No - the device specifies minimum 4 Ω load for binary-mode outputs (OUT1/OUT2) and 8 Ω for ternary-mode LFE output (OUT3). Driving 3 Ω loads risks overcurrent fault triggering and thermal shutdown due to excessive current draw beyond the 10 A peak limit per channel.

How does the "576 × Fs" video mode function in practice?

This mode locks the internal PLL to generate a pixel clock synchronized to audio sample rate (e.g., 576 × 48 kHz = 27.648 MHz), enabling direct HDMI ARC audio-to-video timing alignment without external frame buffers - verified in ST reference design AN4482 for lip-sync error <10 ms.

Is I²C address selection truly hardware-configurable?

Yes - pins AD0 and AD1 accept logic-high/low voltages to set one of four I²C addresses (0x4A, 0x4B, 0x4C, 0x4D) at power-up; no software reconfiguration is needed, allowing daisy-chained multi-device audio systems with independent control.