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Product attributes Property Value
Manufacturer Union Semiconductor International Limited
Product Series UM1550
Packaging Tape & Reel (TR) |
Output Configuration Positive
Output Type Fixed
Number of Regulators 1
Voltage - Input (Max) 8V
Voltage - Output (Min/Fixed) 3V
Voltage - Output (Max) -
Voltage Dropout (Max) 0.3V @ 200mA
Current - Output 300mA
Current - Quiescent (Iq) 3.5 µA
Current - Supply (Max) -
PSRR 56dB ~ 42dB (100Hz ~ 1kHz)
Control Features -
Protection Features Over Current, Over Temperature
Operating Temperature -40°C ~ 125°C (TJ)
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 UM1550Y-30 is a fixed 3V low dropout regulator from Union Semiconductor, capable of delivering 300mA. It features an exceptionally low quiescent current of 3.5µA, making it ideal for battery-powered and energy-harvesting applications. The SOT-89-3 package provides good thermal performance.

  • Ultra-low quiescent current (3.5µA) for extended battery life.
  • High output current (300mA) for versatile applications.
  • Low dropout voltage (0.3V @ 200mA) for efficient operation.
  • SOT-89-3 package offers good thermal dissipation.

Battery-Powered Backup Systems

The ultra-low 3.5µA quiescent current makes it ideal for always-on backup circuits in RTCs and memory.

Energy Harvesting Devices

Minimal power draw allows efficient operation in solar or vibration-powered sensors.

Automotive Electronics

Robust SOT-89-3 package handles higher power dissipation, suitable for car infotainment and body control modules.

Industrial Control

Stable 3V rail for PLCs and industrial sensors, with 300mA capacity for multiple loads.

Smart Meters

Low quiescent current extends battery life in utility meters that operate for years.

Q: What is the output voltage of the UM1550Y-30?
A: The fixed output voltage is 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: The dropout voltage is 0.3V at 200mA load.
Q: What is the quiescent current?
A: The quiescent current is 3.5µA, which is extremely low.
Q: What package is available?
A: It comes in a SOT-89-3 package.
Base Product Number : UM1550Y-30
300mA 3V LDO Linear Regulator Low Dropout SOT-89-3 Ultra-Low Quiescent Current Union Semiconductor
Q: What is the output voltage of the UM1550Y-30?
A: The fixed output voltage is 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: The dropout voltage is 0.3V at 200mA load.
Q: What is the quiescent current?
A: The quiescent current is 3.5µA, which is extremely low.
Q: What package is available?
A: It comes in a SOT-89-3 package.