STMicroelectronics STA369BWSTR

Overview

STA369BWSTR from STMicroelectronics is a 2.1-channel, 40 W high-efficiency digital audio system-on-chip (Sound Terminal®) integrating FFX™ Class-D amplification, dual-band DRC, 8 biquad EQ per channel, and I²S/I²C interfaces. It delivers 2 × 9 W into 4 Ω + 1 × 20 W into 8 Ω (2.1 binary PWM mode at 18 V), supports 32–192 kHz sample rates, and features thermal/short-circuit protection in PowerSSO-36 EPD package for compact audio subsystems.

For engineers reviewing the STA369BWSTR datasheet, STA369BWSTR pinout, STA369BWSTR application, or STA369BWSTR equivalent, key selection considerations include its ternary/binary PWM output flexibility, 100-dB SNR FFX modulation, programmable LFE processing, dual independent DRC engines, and PCB short-circuit protection technology - all critical for cost-sensitive, space-constrained consumer audio designs.

Technical Context

The STA369BWSTR implements a fully integrated digital audio processor with embedded 96-kHz internal sample rate, quantization error noise shaping, and selectable high-/low-bandwidth noise-shaping topologies. Its FFX™ modulation supports scalable index up to 100%, enabling optimized efficiency vs. EMI trade-offs across supply voltages (4.5–21.5 V).

It integrates two independent DRC blocks configurable as B2DRC (dual-band anti-clipper) or separate limiters/compressors, plus EQ-DRC mode where DRC operates on filtered signals. Dedicated LFE path includes 0.125-dB-step bass boost, while three coefficient banks allow fast recall of EQ presets via I²C.

Key Specifications

Pinout & Package

STA369BWSTR uses the PowerSSO-36 EPD (Exposed Pad Down) package - a thermally enhanced 36-pin surface-mount package with exposed thermal pad on underside for efficient heat dissipation in high-power audio applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TAS5756M and MAX98927, STA369BWSTR uniquely combines ternary/binary PWM configurability, 8 biquads/channel, and B2DRC - making it optimal for applications demanding flexible acoustic tuning, high dynamic range, and robust thermal management without external components.

Availability

STA369BWSTR is available at Aetrix Electronics and suitable for home theater soundbars, smart speakers, automotive infotainment displays, and portable Bluetooth speakers requiring stable component supply and long-term production support.

Supply support for STA369BWSTR 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 industrial, automotive, and consumer markets.

The STA369BWSTR belongs to ST's Sound Terminal® family - designed specifically for highly integrated, cost-effective digital audio subsystems in space- and power-constrained consumer electronics.

FAQ

What are the supported I²S input formats and how is channel mapping configured?

The STA369BWSTR supports I²S, left-justified, and right-justified formats with MSB-first or LSB-first configuration via register SAIFB. Channel mapping is programmable through I²C registers (addr 0x0E–0x10), allowing flexible assignment of input channels to L/R/LFE paths - essential for multi-source systems like HDMI ARC or Bluetooth SBC passthrough.

How does the dual-band DRC (B2DRC) function differ from standard single-band compression?

B2DRC splits the audio spectrum into two bands using configurable crossover points, applying independent attack/release thresholds and gain curves to each. This preserves transient detail in highs while aggressively limiting low-frequency peaks - unlike single-band DRC, which applies uniform gain reduction and risks muffling percussive content.

Can the STA369BWSTR drive 4-Ω speakers directly, and what thermal considerations apply?

Yes - in binary PWM mode, it delivers 2 × 9 W into 4 Ω at 18 V. Thermal design must account for PowerSSO-36 EPD's R_θJA of 35°C/W (typical); a minimum 200 mm² copper pour under the exposed pad is required. The IC's thermal warning recovery bypass (register 0x1C) allows custom hysteresis to prevent audible cycling during sustained high-power operation.

What is the purpose of the "coefficient RAM CRC protection" registers (0x60–0x6C)?

These registers implement hardware CRC-16 checksum validation for EQ and DRC coefficient RAM (addresses 0x16–0x26). Upon power-up or coefficient write, the CRC is verified; mismatch triggers FAULT pin assertion and disables output - ensuring audio integrity in mission-critical or safety-aware consumer systems where corrupted filter coefficients could cause distortion or instability.