RT9721AGB

Overview

The RT9721AGB is an N-channel power switch manufactured by Richtek USA Inc., designed for USB switching applications. It operates as a surface-mount device in a SOT-23-5 package, providing a continuous current capacity of 500mA. The component functions as a low-side switch to control power delivery within portable electronic circuits.

Feature Summary

• N-channel power switch architecture
• Designed for USB port protection and switching
• Surface mount construction

Applications

• USB port overcurrent protection
• Portable device power management
• Battery-powered equipment switching

Procurement Notes

Verify the exact package marking and date code against the manufacturer's latest documentation before integration. Confirm RoHS compliance status with the supplier, as legacy stock may vary. Ensure the procurement channel provides traceability for this discontinued or active lifecycle item depending on current availability.

Selection Notes

Select this component when a compact, low-current solution is required for USB interface protection. The SOT-23-5 footprint suits space-constrained designs. Evaluate thermal performance under maximum load conditions to ensure reliability within the operating temperature range specified for portable electronics.

Part Context

This part belongs to Richtek’s portfolio of power management ICs tailored for portable devices. It addresses the need for small PCB size and low power consumption in modern consumer electronics. The series supports various battery management and interface protection requirements.

Replacement Considerations

Cross-reference with other N-channel power switches offering similar 500mA ratings and SOT-23-5 packaging. Verify pin compatibility and threshold voltages before substitution.