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RT9742HNGJ5
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Product Detailed Parameters
- Description：IC PWR SWTCH N-CHAN 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)：1A
- Rds On (Typ)：70mOhm
- 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 RT9742HNGJ5 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 features an ultra-low on-resistance of 55 mΩ typical value. The device integrates comprehensive protection mechanisms including fixed current limiting, short-circuit fold-back, thermal shutdown, and under-voltage lockout (UVLO). A flag output pin provides fault indication to the host controller. The component utilizes an embedded delay function to mitigate inrush current issues during turn-on. It is housed in a TSOT-23-5 surface-mount package.
Feature Summary
- Integrates over-current protection with short fold-back circuitry and thermal shutdown for robust fault management.
- Includes a dedicated flag output pin to signal fault conditions directly to the local USB controller.
- Features an embedded delay function to prevent misoperation caused by inrush currents during startup.
Applications
- USB power supply distribution
- Portable electronic device power management
- Peripheral load switching
Procurement Notes
Verify the specific suffix 'HNGJ5' against the official Richtek datasheet to confirm the exact current rating and package variant, as the RT9742 family includes multiple configurations. Ensure compatibility with your PCB footprint for the TSOT-23-5 package. Check moisture sensitivity levels and storage requirements prior to assembly.
Selection Notes
Select this component when a low-voltage, single-channel high-side switch with integrated fault signaling is required. The 55 mΩ on-resistance supports efficient power delivery for moderate current loads. Consider the UVLO and thermal protection features for systems requiring reliable operation under varying input conditions.
Part Context
The RT9742 series comprises cost-effective, low-voltage high-side power switches optimized for USB applications. The family offers various current ratings and resistance options across different packages such as TSOT-23-5 and SOT-23-3. This specific model belongs to the single-channel subset of that lineup.
Replacement Considerations
Compatible substitutes within the same family include RT9742AGJ5F and RT9742VGJ5, provided their current ratings and package types align with system requirements. Verify pinout and electrical parameters before substitution.
