Richtek USA Inc. RT9166-33GXL

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Product attributes Property Value
Manufacturer Richtek USA Inc.
Product Series
Packaging |
Output Configuration Active
Output Type Positive
Number of Regulators Fixed
Voltage - Input (Max) 5.5V
Voltage - Output (Min/Fixed) 3.3V
Voltage - Output (Max) -
Voltage Dropout (Max) 0.23V @ 300mA (Typ)
Current - Output 300mA
Current - Quiescent (Iq) 300 μA
Current - Supply (Max) -
PSRR 55dB (1kHz)
Control Features -
Protection Features Over Current, Over Temperature
Operating Temperature -40°C ~ 85°C (TA)
Grade -
Qualification -
Mounting Type Surface Mount
Package / Case TO-243AA
Supplier Device Package SOT-89-3
ROHS RoHS Compliant - Hazardous Substance Free Electronic Components | HQICKEY

The RT9166-33GXL from Richtek is a fixed 3.3V LDO regulator offering 300mA output current. With a typical dropout of 0.23V at full load and 300 μA quiescent current, it balances efficiency and performance. The SOT-89-3 package enhances heat dissipation for demanding applications.

  • Enhanced Thermal Performance: SOT-89-3 package dissipates heat better than smaller packages.
  • Low Dropout: 0.23V typical at 300mA maximizes efficiency.
  • Low Quiescent Current: 300 μA for battery-friendly operation.
  • Good Noise Rejection: 55dB PSRR at 1kHz for clean output.

Industrial Control Systems

The SOT-89-3 package provides better thermal performance for 300mA continuous loads in industrial controllers.

3.3V Sensor Power

Stable output with 55dB PSRR at 1kHz ensures accurate readings from analog sensors.

Battery-Powered Tools

Low dropout and quiescent current make it suitable for cordless tools with microcontroller-based control.

Networking Equipment

Provides clean 3.3V power for Ethernet PHY and switch ICs.

Automotive Accessories

Reliable 3.3V regulation for infotainment and telematics modules (if within automotive temp range).

LED Drivers

Can power control logic in LED lighting systems, ensuring consistent brightness.

Q: What is the output voltage of the RT9166-33GXL?
A: The fixed output voltage is 3.3V.
Q: What is the maximum output current?
A: It can deliver up to 300mA.
Q: What is the input voltage range?
A: The input voltage range is not specified in the provided data; refer to the datasheet.
Q: What is the dropout voltage?
A: Typical dropout is 0.23V at 300mA load.
Q: What is the quiescent current?
A: The quiescent current is 300 μA.
Q: What package is available?
A: It comes in a SOT-89-3 package.
Base Product Number : RT9166
3.3V 300mA LDO Linear Regulator Low Dropout Low Quiescent Current Richtek SOT-89-3
Q: What is the output voltage of the RT9166-33GXL?
A: The fixed output voltage is 3.3V.
Q: What is the maximum output current?
A: It can deliver up to 300mA.
Q: What is the input voltage range?
A: The input voltage range is not specified in the provided data; refer to the datasheet.
Q: What is the dropout voltage?
A: Typical dropout is 0.23V at 300mA load.
Q: What is the quiescent current?
A: The quiescent current is 300 μA.
Q: What package is available?
A: It comes in a SOT-89-3 package.