STA350B

Audio Special Purpose Overview

The STA350B is a fully integrated digital audio processor and power amplifier from the Sound Terminal family, designed for high-efficiency amplification. It features an FFX (Fully Flexible Amplification) output stage with four independent half-bridges, supporting stereo, 2.1-channel, and mono-BTL configurations. The device accepts I2S digital audio input and provides up to 2 x 50 W into 6 Ω or 1 x 90 W into 3 Ω at 25 V supply. Integrated processing includes up to 8 programmable biquads per channel, dual-band DRC, and soft-volume control. It operates on a 5 V to 26 V supply range within a 36-PowerSSO package.

Audio Special Purpose Feature Summary

• FFX technology delivering 100 dB SNR and dynamic range
• Configurable output modes: Stereo (2x50W), 2.1 (2x18W+40W), Mono-BTL (1x90W)
• Integrated DSP with 8 user-programmable biquads per channel and dual-band DRC
• I2C control interface with selectable device address and soft-volume update

Audio Special Purpose Applications

• High-fidelity home theater systems
• Active speaker designs requiring bass management
• Automotive infotainment audio processing
• Digital pre-amplifier integration

Audio Special Purpose Procurement Notes

Verify the specific ordering suffix against the manufacturer's datasheet to confirm package orientation (slug-up vs. slug-down). Ensure the design supports the required thermal dissipation for the PowerSSO-36 package under maximum load conditions. Confirm I2C address configuration matches system requirements.

Audio Special Purpose Selection Notes

Select this component when a single-chip solution combining digital signal processing and Class-D amplification is required. Verify that the target application utilizes digital audio interfaces like I2S. Consider the STA350BW variant if a bottom-exposed pad is preferred for thermal management over the standard slug-up configuration of the STA350B.

Audio Special Purpose Part Context

The STA350B belongs to STMicroelectronics' Sound Terminal series, which integrates digital audio streaming capabilities directly to speakers. It shares functional compatibility with the STA339BW series but offers higher power output capabilities through its advanced FFX modulation scheme.

Audio Special Purpose Replacement Considerations

The datasheet explicitly states full compatibility with the STA339BW and STA339BWS models.