Richtek USA Inc. RT9166A-25GX

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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) 2.5V
Voltage - Output (Max) -
Voltage Dropout (Max) 0.58V @ 600mA (Typ)
Current - Output 600mA
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 RT9166A-25GX from Richtek is a fixed 2.5V low dropout linear regulator capable of delivering 600mA. Its low 0.58V dropout voltage and 300 μA quiescent current make it ideal for battery-operated systems. The SOT-89-3 package ensures efficient heat dissipation, while 55dB PSRR provides clean, stable power for sensitive electronics.

  • Extended Battery Life: Low 300 μA quiescent current minimizes standby power draw.
  • High Efficiency at Low Dropout: 0.58V dropout at 600mA allows operation from a 3.3V rail with minimal power loss.
  • Clean Output: 55dB PSRR at 1kHz suppresses input noise, ideal for analog and RF circuits.
  • Robust Thermal Performance: SOT-89-3 package dissipates heat effectively for reliable operation.

Battery-Powered Devices

Ideal for portable electronics where a stable 2.5V rail is needed from a 3.6V Li-ion battery. The low 300 μA quiescent current extends battery life during standby.

FPGA and DSP Core Supplies

Provides a clean, regulated 2.5V supply for low-voltage digital cores. The 55dB PSRR at 1kHz filters out power supply noise, ensuring reliable operation.

Industrial Sensor Interfaces

Powers precision analog sensors and ADCs requiring a stable 2.5V reference. The low dropout voltage (0.58V) allows operation from a 3.3V rail with headroom.

Networking Equipment

Supplies a regulated 2.5V rail for PHY transceivers and switch ICs. The 600mA current capability supports multiple loads simultaneously.

Automotive Infotainment

Regulates vehicle battery voltage down to 2.5V for audio codecs and display drivers. The SOT-89-3 package offers good thermal dissipation for continuous operation.

Q: What is the fixed output voltage of the RT9166A-25GX?
A: The RT9166A-25GX provides a fixed 2.5V output.
Q: What is the maximum output current?
A: It can deliver up to 600mA of output current.
Q: What is the input voltage range for this regulator?
A: The input voltage range is from 2.5V up to the absolute maximum rating (typically 7V).
Q: What is the typical dropout voltage?
A: The typical dropout voltage is 0.58V at a 600mA load.
Q: What is the quiescent current consumption?
A: The quiescent current is typically 300 μA.
Q: What package is the RT9166A-25GX available in?
A: It comes in a SOT-89-3 package.
Base Product Number : RT9166A
2.5V 600mA Fixed Output LDO Linear Regulator Low Dropout Richtek SOT-89-3
Q: What is the fixed output voltage of the RT9166A-25GX?
A: The RT9166A-25GX provides a fixed 2.5V output.
Q: What is the maximum output current?
A: It can deliver up to 600mA of output current.
Q: What is the input voltage range for this regulator?
A: The input voltage range is from 2.5V up to the absolute maximum rating (typically 7V).
Q: What is the typical dropout voltage?
A: The typical dropout voltage is 0.58V at a 600mA load.
Q: What is the quiescent current consumption?
A: The quiescent current is typically 300 μA.
Q: What package is the RT9166A-25GX available in?
A: It comes in a SOT-89-3 package.