LP2981IM5-2.5 NOPB Texas Instruments Integrated Circuit (SOT23 (5-Pin)) In Stock
The LP2981IM5-2.5 NOPB is a 100 mA fixed 2.5 V low-dropout linear regulator in a compact SOT-23-5 package with ultra-low quiescent current. It maintains regulation down to a dropout voltage of approximately 340 mV at full load, suitable for noise-sensitive analog and mixed-signal circuits. Available from authorized distributors with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- SOT23 (5-Pin)
- Pin Count
- 5
- Lifecycle
- ACTIVE
- Datasheet
- LP2981IM5-2.5 NOPB Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LP2981IM5-2.5 NOPB?
- Fixed 2.5 V output with ±1% accuracy over temperature provides precise reference-quality regulation for ADC and DAC supply rails
- Ultra-low 75 µA quiescent current minimizes power consumption in always-on battery-powered sensor nodes
- SOT-23-5 package occupies under 10 mm² of board area, enabling high-density layouts in space-constrained designs
What is LP2981IM5-2.5 NOPB used for?
The LP2981IM5-2.5 NOPB is widely used in portable handheld instruments and IoT sensor nodes where a stable 2.5 V reference supply for analog front-ends must be derived from a 3.3 V or 5 V digital rail with minimal noise coupling. Its ultra-low quiescent current of 75 µA makes it suitable for coin-cell or AA-battery powered systems that must sustain months of standby operation. The device also supplies precision ADCs, DACs, and operational amplifiers in medical diagnostic equipment and industrial measurement modules where supply accuracy directly impacts measurement quality.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the LP2981IM5-2.5 NOPB datasheet?
LP2981IM5-2.5 NOPB Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for LP2981IM5-2.5 NOPB?
Compatible alternatives and drop-in replacements for LP2981IM5-2.5 NOPB:
Fixed Positive LDO Regulator, 2.5V, 0.375V Dropout, BIPolar, PDSO5
Frequently Asked Questions
What is the dropout voltage of the LP2981IM5-2.5 NOPB at full 100 mA load?
The LP2981IM5-2.5 NOPB has a typical dropout voltage of approximately 340 mV at 100 mA output, meaning the input supply must be at least 2.84 V to maintain regulation. This low dropout makes it practical for operation from a 3.3 V rail while preserving a well-regulated 2.5 V output.
How does the LP2981IM5-2.5 NOPB compare to LP2950-2.5 for 2.5 V regulation in portable designs?
The LP2981IM5-2.5 NOPB offers 75 µA quiescent current and a SOT-23-5 footprint versus the LP2950's higher quiescent current and larger package. For battery-powered applications needing 100 mA, the LP2981 provides better standby efficiency, though the LP2950 offers a wider input voltage range of up to 30 V.
What external components are needed to use LP2981IM5-2.5 NOPB in a PCB design?
The LP2981IM5-2.5 NOPB requires only an output bypass capacitor of 1 µF or larger for stability. Texas Instruments recommends a low-ESR ceramic capacitor of 1 µF to 10 µF for best transient response, and an input bypass capacitor of 100 nF close to the input pin to reject supply noise.
Which precision analog applications benefit most from the LP2981IM5-2.5 NOPB output accuracy?
The ±1% output accuracy over the operating temperature range makes the LP2981IM5-2.5 NOPB ideal for supplying 12-bit and 16-bit ADCs, precision op-amps, and voltage references where supply variation directly introduces gain error. Keeping supply error below 25 mV on a 2.5 V rail maintains sub-LSB accuracy in 12-bit signal chains.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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