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The STA421 is a Class-D audio amplifier manufactured by STMicroelectronics (SK).

Specifications:

• Output Power: Up to 2 x 50W (4Ω, 10% THD+N) or 2 x 30W (8Ω, 10% THD+N).
• Supply Voltage Range: ±10V to ±30V (split supply) or 20V to 60V (single supply).
• Efficiency: Up to 90% (typical for Class-D amplifiers).
• THD+N (Total Harmonic Distortion + Noise): Typically <0.1% (1W, 4Ω, 1kHz).
• Signal-to-Noise Ratio (SNR): >100dB (A-weighted).
• Operating Temperature Range: -40°C to +85°C.
• Package: PowerSSO-36 (thermally enhanced).

Descriptions:

• The STA421 is a high-efficiency Class-D audio amplifier designed for high-power audio applications.
• It features advanced modulation techniques to minimize EMI and improve audio quality.
• Supports single-ended and differential input configurations.
• Includes built-in protection circuits (thermal shutdown, overcurrent, undervoltage).

Features:

• High Power Output: Capable of driving 50W per channel into 4Ω loads.
• Low Distortion: <0.1% THD+N for high-fidelity audio.
• Wide Supply Range: Compatible with single or split power supplies.
• Efficient Thermal Management: PowerSSO-36 package with exposed pad for heat dissipation.
• Protection Features:
• Thermal shutdown
• Overcurrent protection
• Undervoltage lockout (UVLO)
• Flexible Input Options: Supports single-ended and differential inputs.

This information is based solely on the STA421 datasheet from STMicroelectronics (SK). No additional recommendations or guidance are provided.