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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) 5V
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-50 is a fixed 5.0V low dropout linear regulator from Union Semiconductor, delivering up to 300mA. With an ultra-low quiescent current of 3.5 µA, it is perfect for energy-conscious designs. The dropout voltage is 0.3V at 200mA, allowing efficient operation. The SOT-89-3 package provides a compact, thermally efficient solution for a variety of applications, from industrial controls to consumer electronics.

  • Ultra-Low Power Consumption: 3.5 µA quiescent current ideal for battery-powered devices.
  • Versatile 5V Output: Compatible with standard 5V logic and analog circuits.
  • 300mA Current Capability: Supports multiple loads or higher-power components.
  • Low Dropout: 0.3V at 200mA ensures efficient use of input voltage.

5V Logic Systems

The 5.0V output is ideal for legacy 5V microcontrollers and logic ICs in industrial control panels.

Sensor Arrays

300mA output can power multiple sensors in environmental monitoring stations, with low quiescent current for solar-powered operation.

Consumer Electronics

Stable 5V rail powers USB peripherals and audio codecs in portable media players.

Automotive Infotainment

Reliable 5V output with 56dB PSRR at 100Hz ensures clean power for display drivers and touch controllers.

Smart Grid Meters

Ultra-low quiescent current and 300mA capability suit smart meters that require long battery life and periodic communication bursts.

Q: What is the output voltage of the UM1550Y-50?
A: The fixed output voltage is 5.0V.
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; please 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 very low at 3.5 µA.
Q: What package is available?
A: It comes in the SOT-89-3 package.
Base Product Number : UM1550Y
300mA 5.0V LDO Linear Regulator Low Quiescent Current SOT-89-3 Union Semiconductor
Q: What is the output voltage of the UM1550Y-50?
A: The fixed output voltage is 5.0V.
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; please 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 very low at 3.5 µA.
Q: What package is available?
A: It comes in the SOT-89-3 package.