A21SP16J

Overview

The A21SP16J is a mono Class-D audio amplifier manufactured by STMicroelectronics. It delivers up to 2.3W of output power into a 4-ohm load and 1.4W into an 8-ohm load. The device operates on a single supply voltage ranging from 2.4V to 5.5V, with typical voltages at 3V or 5V. It features a 9-pin Flip-Chip package (UFBGA/FCBGA) measuring 1.6x1.6mm. Key electrical parameters include a maximum supply current of 3.3mA at 5V, THD+N of 1% at 8W, and an operating temperature range of -40°C to 85°C.

Feature Summary

• Class-D topology for high efficiency in compact designs
• Integrated pop-and-click suppression circuitry
• Built-in thermal protection mechanisms

Applications

• Portable audio devices
• Mobile phone speaker amplification
• Small form-factor multimedia systems

Procurement Notes

Verify component status as sources indicate potential end-of-life or obsolescence notices. Confirm RoHS compliance and specific packaging options such as tape and reel or cut tape. Ensure the selected variant matches the required flip-chip footprint and pin configuration for PCB integration.

Selection Notes

Select this component for applications requiring a small footprint and low power consumption. The 9-pin flip-chip package suits space-constrained designs. Verify that the load impedance matches the specified output power ratings. Consider the single-supply voltage range compatibility with the system's power architecture.

Part Context

This part belongs to the A21SP16 series of audio amplifiers. It is designed for mobile and portable electronics where size and efficiency are critical. The flip-chip technology allows for minimal board space usage compared to traditional packages.

Replacement Considerations

Potential substitutes include IS31AP2010B and LM4675TL/NOPB. Verify pinout compatibility and electrical specifications before substitution.