Union Semiconductor International Limited UM1550S-28
| Quantity | Unit Price | Total Price |
|---|---|---|
| 1 | $1.04 | $1.04 |
| 15+ | $0.24 | $3.60 |
| 25+ | $0.23 | $5.75 |
| 50+ | $0.22 | $11.00 |
| 100+ | $0.20 | $20.00 |
| N+ | $0.04 | Price Inquiry |
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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) | 2.8V |
| 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-236-3, SC-59, SOT-23-3 |
| Supplier Device Package | SOT-23-3 |
| ROHS |  |
The UM1550S-28 is a low dropout linear regulator offering a fixed 2.8V output with up to 300mA current. Its ultra-low quiescent current of 3.5µA and PSRR of 56dB at 100Hz make it excellent for battery-powered and noise-sensitive applications. The SOT-23-3 package is compact and cost-effective.
- Ultra-low quiescent current (3.5µA) dramatically extends battery life.
- High PSRR (56dB @ 100Hz) rejects power supply noise.
- 300mA output supports a wide range of loads.
- Small SOT-23-3 package for space-constrained designs.
Ultra-Low-Power IoT Nodes
3.5µA quiescent current is ideal for battery-powered sensors that sleep most of the time.
RF Power Supplies
PSRR of 56dB at 100Hz filters mains noise, ensuring clean power for RF amplifiers.
Portable GPS Modules
300mA capacity supports GPS receivers while maintaining low standby drain.
Hearing Aids
Low quiescent current and small SOT-23-3 package fit hearing aid designs.
Smart Meters
Stable 2.8V rail for metering ICs with long battery life requirements.
Wearable Health Monitors
Combines low dropout and high PSRR for consistent operation in compact wearables.
- Q: What is the output voltage?
- A: Fixed 2.8V output.
- Q: What is the maximum current?
- A: 300mA maximum output current.
- Q: What is the input voltage range?
- A: Not specified in provided data; consult the datasheet.
- Q: What is the dropout voltage?
- A: 0.3V at 200mA load.
- Q: What is the quiescent current?
- A: 3.5µA, extremely low.
- Q: What is the PSRR?
- A: 56dB at 100Hz to 42dB at 1kHz.
UM1550S-28.pdf
- Q: What is the output voltage?
- A: Fixed 2.8V output.
- Q: What is the maximum current?
- A: 300mA maximum output current.
- Q: What is the input voltage range?
- A: Not specified in provided data; consult the datasheet.
- Q: What is the dropout voltage?
- A: 0.3V at 200mA load.
- Q: What is the quiescent current?
- A: 3.5µA, extremely low.
- Q: What is the PSRR?
- A: 56dB at 100Hz to 42dB at 1kHz.
