| Quantity | Unit Price | Total Price |
|---|---|---|
| 1 | $0.33 | $0.33 |
| 15+ | $0.32 | $4.80 |
| 25+ | $0.32 | $8.00 |
| 50+ | $0.30 | $15.00 |
| 100+ | $0.26 | $26.00 |
| N+ | $0.05 | Price Inquiry |
Request Quote / Inquiry
| Product attributes | Property Value |
| Manufacturer | Union Semiconductor International Limited |
| Product Series | |
| Packaging | Tape & Reel (TR) | |
| Output Configuration | Positive |
| Output Type | Adjustable |
| Number of Regulators | 1 |
| Voltage - Input (Max) | 8V |
| Voltage - Output (Min/Fixed) | - |
| Voltage - Output (Max) | 5V |
| 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-236-3, SC-59, SOT-23-3 |
| Supplier Device Package | SOT-23-3 |
| ROHS |  |
The UM1550S is a fixed 5V low dropout linear regulator from Union Semiconductor, delivering up to 300mA with a dropout of just 0.3V at 200mA. Its ultra-low 3.5 µA quiescent current makes it an excellent choice for battery-powered applications. The SOT-23-3 package ensures a minimal footprint, while PSRR of 56dB to 42dB (100Hz–1kHz) provides clean, stable power for noise-sensitive circuits.
- Extended Battery Life: Ultra-low 3.5 µA quiescent current minimizes standby power consumption.
- High Efficiency at Low Dropout: 0.3V dropout at 200mA allows operation close to the output voltage, reducing power loss.
- Clean Output: PSRR of 56dB at 100Hz effectively filters input ripple from switching regulators.
- Compact Design: SOT-23-3 package saves board space for portable and wearable devices.
Battery-Powered IoT Sensors
The ultra-low 3.5 µA quiescent current extends battery life in always-on sensor nodes, while the 300mA output supports periodic wireless transmissions.
Portable Medical Devices
A stable 5V rail with 56dB PSRR at 100Hz minimizes noise from switching converters, ensuring reliable operation of sensitive measurement circuits.
Wearable Electronics
The compact SOT-23-3 package and low dropout of 0.3V at 200mA make it ideal for space-constrained wearables powered by single-cell Li-ion batteries.
Industrial Control Modules
Provides a clean 5V supply for microcontrollers and digital logic, with PSRR up to 42dB at 1kHz to reject industrial noise.
Smart Home Hubs
Maintains stable 5V output for communication modules and sensors, with low quiescent current for always-on standby modes.
Automotive Accessory Power
Regulates vehicle battery voltage down to a stable 5V for dashcams and GPS trackers, with sufficient current for peripheral loads.
- Q: What is the output voltage of the UM1550S?
- A: The UM1550S provides a fixed 5V 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 specified in the provided data; refer to the datasheet.
- Q: What is the dropout voltage?
- A: 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 a SOT-23-3 package.
UM1550S.pdf
- Q: What is the output voltage of the UM1550S?
- A: The UM1550S provides a fixed 5V 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 specified in the provided data; refer to the datasheet.
- Q: What is the dropout voltage?
- A: 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 a SOT-23-3 package.
