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Product attributes Property Value
Manufacturer ETEK MICROELECTRONICS
Product Series
Packaging Tape & Reel (TR) |
Output Configuration Positive
Output Type Fixed
Number of Regulators 1
Voltage - Input (Max) 5.5V
Voltage - Output (Min/Fixed) 3V
Voltage - Output (Max) -
Voltage Dropout (Max) 0.39V @ 300mA
Current - Output 300mA
Current - Quiescent (Iq) 70 µA
Current - Supply (Max) -
PSRR 75dB ~ 65dB (1kHz ~ 10kHz)
Control Features Enable
Protection Features Over Current, Over Temperature
Operating Temperature -40°C ~ 85°C (TA)
Grade -
Qualification -
Mounting Type Surface Mount
Package / Case SC-74A, SOT-753
Supplier Device Package SOT-23-5
ROHS RoHS Compliant - Hazardous Substance Free Electronic Components | HQICKEY

The ETEK MICROELECTRONICS ET51630B is a fixed 3V low dropout linear regulator delivering up to 300mA. It features an ultra-low quiescent current of 70µA and a dropout voltage of just 0.39V at full load. With PSRR of 75dB at 1kHz, it provides clean power for sensitive RF and analog circuits. The SOT-23-5 package is ideal for compact, battery-powered designs.

  • Ultra-Low Quiescent Current: 70µA maximizes battery life in portable devices.
  • Low Dropout: 0.39V at 300mA allows operation with minimal headroom.
  • High PSRR: 75dB at 1kHz reduces noise from switching converters.
  • Compact SOT-23-5: Small footprint for space-constrained designs.

Portable Electronics

Power sensors, MCUs, and RF modules in battery-operated devices. The 70µA quiescent current is ideal for energy-saving designs.

Wearable Devices

Supply 3V to fitness trackers and smartwatches. The small SOT-23-5 package fits tight PCB layouts.

IoT Modules

Regulate 3V for Wi-Fi, Bluetooth, and LoRa modules. Low dropout ensures stable operation from Li-ion batteries.

Medical Devices

Power glucose monitors and hearing aids. Low quiescent current extends battery life in critical applications.

Wireless Sensors

Provide clean 3V for sensor nodes. The PSRR of 75dB at 1kHz reduces noise from switching regulators.

Consumer Gadgets

Power remote controls, toys, and small appliances. Reliable and efficient.

Q: What is the output voltage?
A: The ET51630B provides a fixed 3V output.
Q: What is the maximum output current?
A: It can deliver up to 300mA of output current.
Q: What is the input voltage range?
A: The input voltage is 3V (nominal).
Q: What is the dropout voltage?
A: Dropout is 0.39V at 300mA load.
Q: What is the quiescent current?
A: Quiescent current is only 70µA.
Q: What package is available?
A: It comes in a compact SOT-23-5 package.
Base Product Number : ET51630B
300mA 3V ETEK LDO Linear Regulator Low Quiescent Portable SOT-23-5
Q: What is the output voltage?
A: The ET51630B provides a fixed 3V output.
Q: What is the maximum output current?
A: It can deliver up to 300mA of output current.
Q: What is the input voltage range?
A: The input voltage is 3V (nominal).
Q: What is the dropout voltage?
A: Dropout is 0.39V at 300mA load.
Q: What is the quiescent current?
A: Quiescent current is only 70µA.
Q: What package is available?
A: It comes in a compact SOT-23-5 package.