RT9742KNGV

Overview

The RT9742KNGV is a single N-MOSFET high-side power switch IC designed for USB applications. It operates within a supply voltage range of 2.7 V to 6 V and features a maximum on-resistance of 70 mΩ. The device provides a fixed output current limit of 1.5 A, with a maximum operating time of 2.1 ms. It supports non-inverting input control and includes fault protection mechanisms such as over-temperature shutdown, reverse current blocking, and under-voltage lockout (UVLO). The component is housed in a compact SOT-23-3 package suitable for surface-mount installation.

Feature Summary

• Single-channel high-side power switching optimized for USB interface applications
• Integrated fault protection including fixed current limiting, over-temperature shutdown, and reverse current blocking
• Low conduction loss achieved through low on-resistance characteristics
• Non-inverting logic input for straightforward control integration

Applications

• USB port power distribution circuits
• Battery-powered portable devices requiring load switching
• Over-current protection stages in consumer electronics

Procurement Notes

Verify the complete part number including suffixes against manufacturer datasheets to ensure correct pinout and electrical specifications. Confirm RoHS compliance status and packaging details directly with authorized distributors. Cross-reference ordering codes with official Richtek documentation to avoid substitution errors during procurement.

Selection Notes

Select this component when a single-channel high-side switch with integrated USB-specific protections is required. Ensure the load current does not exceed the 1.5 A fixed limit. Verify that the system voltage remains within the 2.7 V to 6 V operational range. Consider the SOT-23-3 package constraints for thermal management and PCB layout requirements.

Part Context

The RT9742 series comprises cost-effective, low-voltage power switches intended for USB applications. These ICs integrate an N-MOSFET with control logic to provide efficient power management. The family offers various current ratings and configurations to suit different load requirements while maintaining small form factors for modern electronic designs.

Replacement Considerations

Consult official Richtek documentation for verified substitute part numbers. Do not assume functional equivalence between variants without confirming pin compatibility and electrical parameter alignment.