STA381BWSTR

Audio Special Purpose Overview

The STA381BWSTR is a fully integrated 2.1-channel high-efficiency digital audio system from STMicroelectronics, part of the Sound Terminal family. It embeds digital audio processing, digital amplification, and FFX power output stages within a 48-VQFN package. The device operates on a supply voltage of 4.5 V to 25.5 V and supports I2C control with selectable addresses alongside an I2S interface for sampling rates between 32 kHz and 192 kHz. Key electrical specifications include driving 2 x 20 W into 8 Ω loads or 2 x 9 W into 4 Ω plus a 1 x 20 W subwoofer channel. It features embedded protections such as short-circuit, thermal, overcurrent, and undervoltage safeguards.

Audio Special Purpose Feature Summary

• Three configurable output power stage modes: 2.0 (L/R full bridges), 2.1 (L/R half-bridges + sub full bridge), and 2.1 with external subwoofer PWM output.
• Embedded STCompressor dual-band DRC and up to 12 user-programmable biquads with noise-shaping technology for advanced audio tuning.
• Integrated headphone driver with negative charge pump and capless configuration, delivering 40 mW into 32 Ω.
• Fixed internal processing sampling rate of 88.2 kHz or 96 kHz with automatic input sampling frequency conversion.

Audio Special Purpose Applications

• Pre-amplifier circuits
• High-efficiency digital audio systems
• 2.1-channel speaker configurations

Audio Special Purpose Procurement Notes

Verify that the ordering suffix 'STR' corresponds to the Tape & Reel packing format as specified in the datasheet summary table. Confirm the device grade and operating temperature range of 0°C to 70°C align with the target application environment requirements before finalizing procurement.

Audio Special Purpose Selection Notes

Select this component when a fully integrated solution combining DSP, amplifier, and protection is required for space-constrained designs. Ensure the load impedance matches the supported configurations (8 Ω or 4 Ω) and verify that the I2S interface timing meets the system's clocking constraints.

Audio Special Purpose Part Context

The STA381BWS belongs to the Sound Terminal series, designed to provide cost-effective, low-power digital audio streaming from source to speaker. The 'STR' suffix indicates the specific packaging variant supplied in tape and reel form, suitable for automated surface-mount assembly processes.

Audio Special Purpose Replacement Considerations

The non-reel version STA381BWS serves as the tray-packaged equivalent. No other direct cross-model substitutes are documented in the provided data.