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Product attributes Property Value
Manufacturer ETEK MICROELECTRONICS
Product Series ET5H2XX
Packaging Tape & Reel (TR) |
Output Configuration Positive
Output Type Fixed
Number of Regulators 1
Voltage - Input (Max) 36V
Voltage - Output (Min/Fixed) 3.3V
Voltage - Output (Max) -
Voltage Dropout (Max) 1.3V @ 300mA
Current - Output 300mA
Current - Quiescent (Iq) 4.5 µA
Current - Supply (Max) -
PSRR 60dB (1kHz)
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 ET5H233B is a fixed 3.3V low dropout linear regulator designed for ultra-low power applications. With a maximum output current of 300mA and an exceptionally low quiescent current of 4.5 µA, it is ideal for battery-powered and energy-conscious designs. The SOT-23-5 package offers a compact footprint, while the 1.3V dropout voltage at full load ensures efficient operation. This regulator delivers stable 3.3V power with 60dB PSRR at 1kHz, making it suitable for portable and IoT devices.

  • Ultra-Low Quiescent Current: 4.5 µA extends battery life in standby and always-on applications.
  • Compact SOT-23-5 Package: Saves PCB space for miniaturized designs.
  • Low Dropout Voltage: 1.3V dropout enables operation from low input voltages.
  • Stable Output: 60dB PSRR at 1kHz provides clean power for sensitive electronics.

Wearable Electronics

Perfect for smartwatches and fitness trackers where battery life is critical. The 4.5 µA quiescent current minimizes standby power consumption.

IoT Sensor Nodes

Powers wireless sensors and microcontrollers in always-on IoT devices. The low quiescent current extends battery life between transmissions.

Portable Medical Devices

Provides stable 3.3V for glucose monitors and pulse oximeters. The small SOT-23-5 package fits compact PCB designs.

Battery-Powered Remote Controls

Ideal for remote controls and wireless peripherals. The low dropout voltage allows operation from nearly depleted batteries.

Energy Harvesting Systems

Works with low-power energy sources. The 4.5 µA quiescent current ensures minimal load on harvested energy.

Standby Power Circuits

Maintains voltage for RTCs and memory in standby mode. The ultra-low quiescent current keeps total system power draw minimal.

Q: What is the output voltage of the ET5H233B?
A: The fixed output voltage is 3.3V.
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 must be above 3.3V plus dropout; typically 4.6V or higher.
Q: What is the dropout voltage?
A: Dropout voltage is 1.3V at 300mA load.
Q: What is the quiescent current?
A: Ultra-low quiescent current of only 4.5 µA, ideal for battery-powered applications.
Q: What package is available?
A: It comes in a compact SOT-23-5 package.
Base Product Number : ET5H233B
3.3V 300mA Battery Powered IoT LDO Linear Regulator SOT-23-5 Ultra-Low Quiescent
Q: What is the output voltage of the ET5H233B?
A: The fixed output voltage is 3.3V.
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 must be above 3.3V plus dropout; typically 4.6V or higher.
Q: What is the dropout voltage?
A: Dropout voltage is 1.3V at 300mA load.
Q: What is the quiescent current?
A: Ultra-low quiescent current of only 4.5 µA, ideal for battery-powered applications.
Q: What package is available?
A: It comes in a compact SOT-23-5 package.