Texas Instruments LP2981IM5-3.3
| Quantity | Unit Price | Total Price |
|---|---|---|
| 1 | $4.12 | $4.12 |
| 15+ | $0.96 | $14.40 |
| 25+ | $0.94 | $23.50 |
| 50+ | $0.88 | $44.00 |
| 100+ | $0.78 | $78.00 |
| N+ | $0.16 | Price Inquiry |
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| Product attributes | Property Value |
| Manufacturer | Texas Instruments |
| Product Series | |
| Packaging | Tape & Reel (TR) | |
| Output Configuration | Obsolete |
| Output Type | Positive |
| Number of Regulators | Fixed |
| Voltage - Input (Max) | 16V |
| Voltage - Output (Min/Fixed) | 3.3V |
| Voltage - Output (Max) | - |
| Voltage Dropout (Max) | 0.37V @ 100mA |
| Current - Output | 100mA |
| Current - Quiescent (Iq) | 95 μA |
| Current - Supply (Max) | 1.7 mA |
| PSRR | 63dB (1kHz) |
| Control Features | Enable |
| Protection Features | Over Current, Over Temperature, Short Circuit |
| Operating Temperature | -40°C ~ 125°C |
| Grade | - |
| Qualification | - |
| Mounting Type | Surface Mount |
| Package / Case | SC-74A, SOT-753 |
| Supplier Device Package | SOT-23-5 |
| ROHS |  |
The LP2981IM5-3.3 from National Semiconductor is a precision 100mA low-dropout linear regulator with a fixed 3.3V output. It features an ultra-low quiescent current of 95µA, making it ideal for battery-powered applications. The 370mV dropout voltage ensures efficient operation even with low input margins. Packaged in a compact SOT-23-5, it offers excellent noise performance with 63dB PSRR at 1kHz. Perfect for portable instruments, wireless sensors, and wearable devices.
- Ultra-Low Quiescent Current: 95µA extends battery life significantly, ideal for always-on and standby applications.
- Wide Input Range: Accepts up to 16V, providing flexibility for automotive and industrial power sources.
- Compact SOT-23-5: Saves PCB space, enabling miniaturized designs for portable and wearable electronics.
- Low Dropout: 370mV at 100mA allows regulation from a 3.7V lithium cell with minimal power loss.
Battery-Powered Instruments
The ultra-low 95µA quiescent current makes it perfect for multimeters, thermometers, and handheld testers, extending battery life to years.
Wireless Sensor Nodes
In Zigbee or LoRa modules, this LDO provides a stable 3.3V rail for microcontrollers and RF transceivers, with low dropout ensuring operation from nearly depleted batteries.
Portable Medical Monitors
Its low noise and small footprint make it suitable for glucose meters and pulse oximeters, powering sensitive analog front-ends with minimal interference.
Memory Backup Circuits
Use it to maintain 3.3V for SRAM or RTC backup in industrial controllers, where the low quiescent current minimizes drain on backup batteries.
Consumer Wearables
The SOT-23-5 package and 100mA output are ideal for smartwatches and fitness trackers, powering sensors and displays efficiently.
Automotive Key Fobs
With input capability up to 16V, it can regulate directly from a car battery, providing a stable 3.3V supply for remote keyless entry systems.
- Q: What is the output voltage of the LP2981IM5-3.3?
- A: The fixed output voltage is 3.3V.
- Q: What is the maximum output current?
- A: It can deliver up to 100mA of continuous current.
- Q: What is the input voltage range?
- A: The input voltage range is from 3.7V to 16V (typical).
- Q: What is the dropout voltage?
- A: The typical dropout voltage is 370mV at 100mA load.
- Q: What is the quiescent current?
- A: The quiescent current is typically 95µA.
- Q: What package is available?
- A: It comes in a compact SOT-23-5 package.
LP2981IM5-3.3.pdf
- Q: What is the output voltage of the LP2981IM5-3.3?
- A: The fixed output voltage is 3.3V.
- Q: What is the maximum output current?
- A: It can deliver up to 100mA of continuous current.
- Q: What is the input voltage range?
- A: The input voltage range is from 3.7V to 16V (typical).
- Q: What is the dropout voltage?
- A: The typical dropout voltage is 370mV at 100mA load.
- Q: What is the quiescent current?
- A: The quiescent current is typically 95µA.
- Q: What package is available?
- A: It comes in a compact SOT-23-5 package.
