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RT9742FGJ5
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Product Detailed Parameters
- Description：IC PWR SWITCH N-CHAN 1:1 SOT23-5
- Series：-
- Mfr：Richtek USA Inc.
- Package：Tape & Reel (TR),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)：70mOhm
- Input Type：Non-Inverting
- Features：Load Discharge, 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
- Package / Case：SOT-23-5 Thin, TSOT-23-5
- Grade：-
- Qualification：-
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Overview
The RT9742FGJ5 is a single N-channel high-side power switch IC designed for USB applications, manufactured by Richtek USA Inc. It operates within a supply voltage range of 2.7 V to 6 V and is housed in a TSOT-23-5 package. This component features a maximum on-resistance of 70 mΩ and supports an output current of 1 A with a fixed current limit of 1 A. The device includes integrated protection circuits such as over-current protection, short fold-back, thermal shutdown, and under-voltage lockout. It also incorporates an embedded delay function to prevent misoperation from inrush currents and provides a flag output to indicate fault conditions.
Feature Summary
- Integrates comprehensive fault protection including over-current, short fold-back, thermal shutdown, and under-voltage lockout.
- Features an embedded delay function to prevent misoperation caused by inrush currents.
- Provides a dedicated flag output pin to signal fault conditions to the local USB controller.
Applications
- USB peripheral power distribution
- Notebook PC power switching
Procurement Notes
Verify the specific suffix 'FGJ5' against official Richtek documentation to confirm the exact current rating and resistance parameters, as the RT9742 series utilizes suffixes to denote variations in electrical characteristics. Ensure the ordering part number matches the required package type and tape/reel specifications for your manufacturing process.
Selection Notes
Select this component for low-voltage USB power distribution where compact size and integrated protection are critical. Consider the 70 mΩ on-resistance and 1 A current limit when designing for thermal management and load requirements. Verify compatibility with the system's operating voltage range of 2.7 V to 6 V.
Part Context
The RT9742 series consists of cost-effective, low-voltage, single N-MOSFET high-side power switches optimized for USB applications. The family offers various current ratings and package options, including TSOT-23-5, TSOT-23-5 (FC), and SOT-23-3, to support flexible design implementations across different portable electronic devices.
Replacement Considerations
Other variants within the RT9742 family, such as RT9742AGJ5 or RT9742GGJ5, may serve as alternatives if their specific current ratings and on-resistance values align with the design requirements. Always verify pin compatibility and electrical specifications before substitution.
