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Product attributes Property Value
Manufacturer ETEK MICROELECTRONICS
Product Series ET5H5XX
Packaging Tape & Reel (TR) |
Output Configuration Positive
Output Type Fixed
Number of Regulators 1
Voltage - Input (Max) 40V
Voltage - Output (Min/Fixed) 3.3V
Voltage - Output (Max) -
Voltage Dropout (Max) 1.5V @ 300mA
Current - Output 300mA
Current - Quiescent (Iq) 6.5 µA
Current - Supply (Max) -
PSRR 52dB (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 TO-243AA
Supplier Device Package SOT-89-3
ROHS RoHS Compliant - Hazardous Substance Free Electronic Components | HQICKEY

The ET5H533F is a fixed 3.3V LDO regulator from ETEK Microelectronics, capable of delivering 300mA. It features an ultra-low quiescent current of 6.5µA, making it excellent for battery-powered applications. The dropout voltage is 1.5V at full load, and PSRR is 52dB at 1kHz. Housed in a SOT-89-3 package, it balances performance and thermal dissipation.

  • Ultra-Low IQ (6.5µA): Extends battery life in standby and active modes, ideal for IoT.
  • High Current (300mA): Supports power-hungry wireless modules and sensors.
  • Stable 3.3V Output: Ensures reliable operation for digital logic and RF circuits.
  • SOT-89-3 Package: Good thermal performance for moderate power dissipation.

Battery-Powered Microcontrollers

With 6.5µA quiescent current, it's ideal for always-on MCU systems in remote sensors, preserving battery life for years.

Wearable Fitness Trackers

The 300mA capability supports Bluetooth SoCs and display drivers while maintaining low standby power.

Smart Home Sensors

Provides stable 3.3V for Zigbee/Thread modules in thermostats and door sensors, with low dropout for battery operation.

Portable Medical Devices

Powers glucose meters and pulse oximeters with reliable 3.3V rail, ensuring consistent operation from alkaline or Li-ion batteries.

Energy Harvesting Systems

Low quiescent current makes it suitable for solar or vibration-powered devices where every microamp counts.

Q: What is the output voltage of the ET5H533F?
A: It provides a fixed 3.3V output.
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 explicitly specified; typically up to 5.5V for 3.3V LDOs, but verify with datasheet.
Q: What is the dropout voltage?
A: Dropout is 1.5V at 300mA load.
Q: What is the quiescent current?
A: The quiescent current is extremely low at 6.5µA.
Q: What package is available?
A: It comes in a SOT-89-3 package.
Base Product Number : ET5H533F
3.3V 300mA ETEK LDO Linear Regulator Low Quiescent Current SOT-89-3
Q: What is the output voltage of the ET5H533F?
A: It provides a fixed 3.3V output.
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 explicitly specified; typically up to 5.5V for 3.3V LDOs, but verify with datasheet.
Q: What is the dropout voltage?
A: Dropout is 1.5V at 300mA load.
Q: What is the quiescent current?
A: The quiescent current is extremely low at 6.5µA.
Q: What package is available?
A: It comes in a SOT-89-3 package.