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RT9742FNGJ5F
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Product Detailed Parameters
- Description：IC PWR SWITCH N-CHAN 1:1 SOT23-5
- 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
- Package / Case：SOT-23-5 Thin, TSOT-23-5
- Grade：-
- Qualification：-
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Overview
The RT9742FNGJ5F is a single N-channel high-side power switch IC designed for USB applications. It operates within a supply voltage range of 2.7V to 6V and features an output current capability of 1.5A with a maximum on-resistance of 55mΩ. The device integrates comprehensive protection mechanisms including fixed current limiting, thermal shutdown, reverse current blocking, and under-voltage lockout (UVLO). A status flag output indicates fault conditions to the host controller. The component utilizes a TSOT-23-5 surface-mount package and functions across an operating temperature range of -40°C to +85°C.
Feature Summary
- Integrates over-current protection with short circuit fold-back and thermal shutdown circuits for robust fault management.
- Provides a dedicated flag output pin to signal active fault conditions to the local USB controller.
- Includes an embedded delay function to prevent false triggering caused by inrush currents during startup.
Applications
- USB power distribution networks
- Portable electronic device power management
- Battery-powered equipment load switching
Procurement Notes
Verify the specific suffix 'FNGJ5F' against the manufacturer's official datasheet to confirm the exact current rating and package variant. Ensure compatibility with the target PCB footprint and thermal requirements. Confirm RoHS compliance status and moisture sensitivity level prior to assembly planning.
Selection Notes
Select this component when a low-profile single-channel high-side switch is required for USB loads. The 55mΩ on-resistance supports efficient power delivery for moderate current demands. The integrated flag feature simplifies system monitoring compared to switches without status outputs.
Part Context
This part belongs to the Richtek RT9742 family of low-voltage high-side power switches. The family offers various current ratings and resistance options to suit different USB port requirements. The RT9742 series is optimized for cost-effective integration into portable electronics requiring reliable power distribution.
Replacement Considerations
Check for other RT9742 variants with matching 1.5A ratings and TSOT-23-5 packages. Verify that substitute parts maintain compatible on-resistance and protection threshold levels to ensure system reliability.
