RT9742ENGJ5F

Description：IC PWR SWITCH N-CH 1:1 TSOT23-5
Series：-
Mfr：Richtek USA Inc.
Package：Cut Tape (CT)

SKU:ed700a62942c Category: Power Distribution Switches, Load Drivers Brand: Richtek USA Inc.

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Product introduction

Product Detailed Parameters

Description：IC PWR SWITCH N-CH 1:1 TSOT23-5
Series：-
Mfr：Richtek USA Inc.
Package：Cut Tape (CT)
Switch Type：USB Switch
Number of Outputs：1
Ratio - Input:Output：1:01
Output Configuration：High Side
Output Type：N-Channel
Interface：On/Off
Voltage - Load：2.7V ~ 6V
Voltage - Supply (Vcc/Vdd)：Not Required
Current - Output (Max)：1.5A
Rds On (Typ)：55mOhm
Input Type：Non-Inverting
Features：Status Flag
Fault Protection：Current Limiting (Fixed), Over Temperature, Reverse Current, UVLO
Operating Temperature：-40°C ~ 85°C (TA)
Mounting Type：Surface Mount
Supplier Device Package：TSOT-23-5 (FC)
Package / Case：SOT-23-5 Thin, TSOT-23-5
Grade：-
Qualification：-

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RT9742ENGJ5F

Overview

The RT9742ENGJ5F is a single-channel high-side power switch IC designed for USB applications. It features an N-channel MOSFET with a typical on-resistance of 55 mΩ and a maximum current limit of 1.5 A. The device operates within a load voltage range of 2.7 V to 6 V. Key electrical parameters include a maximum turn-on time of 2.1 ms and a quiescent current of 0.03 mA. It supports surface mount installation in a TSOT-23-5 package and functions across a temperature range of -40°C to +85°C.

Feature Summary

Integrates comprehensive fault protection including fixed over-current, thermal shutdown, reverse current blocking, and under-voltage lockout.
Provides a status flag output to indicate fault conditions to the local controller.
Includes an embedded delay function to prevent misoperation caused by inrush current.

Applications

USB power supply distribution
High-side switching for peripheral devices
Load driver circuits requiring over-current protection

Procurement Notes

Verify the specific suffix 'ENGJ5F' against the manufacturer's official datasheet to confirm the exact current rating and package variant. Ensure the ordering part number matches the required pinout and electrical specifications for the target application design.

Selection Notes

Select this component when a single-channel high-side switch with integrated protection is required. Consider the 55 mΩ on-resistance for efficiency and the 1.5 A current limit for load capacity. Verify compatibility with the system's voltage range and thermal requirements.

Part Context

This part belongs to the RT9742 family of low-voltage power switches. Variants within the series offer different current ratings and resistance values, such as 3A or 1A options, to suit various USB port and peripheral power management needs.

Replacement Considerations

Check for direct substitutes like the RT9742AGJ5F or RT9742A series variants. Confirm that alternative parts match the 55 mΩ resistance, 1.5 A limit, and TSOT-23-5 package dimensions before substitution.