RT9742LNGV

Overview

The RT9742LNGV is a single N-channel 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 an on-state resistance of 0.07 ohms with a current limit of 1.1 A. The device includes comprehensive protection mechanisms such as fixed current limiting, over-temperature shutdown, reverse current blocking, and under-voltage lockout (UVLO). It is housed in a compact SOT-23-3 surface-mount package and functions reliably across an operating temperature range of -40°C to +85°C.

Feature Summary

• Integrates an N-MOSFET high-side switch optimized for low-voltage USB load management
• Provides robust fault protection including fixed current limiting and thermal shutdown
• Supports reverse current blocking to prevent backflow from output to input
• Features under-voltage lockout to ensure stable operation during power transitions

Applications

• USB port power distribution and switching
• Battery-powered portable electronic devices
• Load switching in mobile communication equipment
• Power management circuits for consumer electronics

Procurement Notes

Verify the specific suffix LNGV corresponds to the SOT-23-3 package and tape-and-reel packaging configuration. Confirm that the manufacturer designation Richtek USA Inc. aligns with your supply chain requirements. Ensure the component status is listed as Active for long-term availability. Cross-reference the datasheet revision date to guarantee compatibility with your design specifications.

Selection Notes

Select this component when a cost-effective, single-channel high-side switch is required for 5V USB systems. The 0.07 ohm on-resistance offers efficient power delivery for loads up to 1.1 A. Consider the SOT-23-3 footprint for space-constrained designs. Evaluate the need for reverse current blocking and thermal protection features inherent to this integrated solution compared to discrete MOSFET implementations.

Part Context

The RT9742 series comprises low-voltage power switches tailored for USB applications. This specific model represents the single-channel variant in a minimal SOT-23-3 package. It serves as a fundamental building block for power distribution networks in portable devices, offering integrated protection features that simplify circuit design and enhance system reliability without requiring external components.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify pin-to-pin compatibility and electrical parameter equivalence before considering alternative manufacturers or generic equivalents.