LP2981IM5-2.5 Equivalent & Substitute Parts

Part Overview

The LP2981IM5-2.5 is a micropower linear voltage regulator IC from Texas Instruments, delivering a fixed 2.5V output at 100mA in a surface-mount SOT-23-5 package. This device is classified as Last Time Buy, indicating discontinued production. Alternative equivalent parts are necessary for ongoing design support and procurement continuity.

Substiute Parts

LP2981IM5-2.5

Texas InstrumentsIn Stock: 3453LP2981IM5-2.5 Datasheet

Current PartRFQ

LP2981IM5-2.5/NOPB

National SemiconductorIn Stock: 1817LP2981IM5-2.5/NOPB Datasheet

DirectRFQ

MIC5225-2.5YM5-TR

Microchip TechnologyIn Stock: 1032MIC5225-2.5YM5-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LP2981IM5-2.5 is determined by the following critical parameters:

• Fixed output voltage of 2.5V
• Output current capability of 100mA or greater
• Maximum input voltage of 16V or higher
• SOT-23-5 package compatibility
• Operating temperature range of -40°C to 125°C or wider
• Enable control feature
• Protection against over-current, over-temperature, and short-circuit conditions

Parts meeting these criteria maintain functional and mechanical compatibility with the original design.

Parameter Comparison

Engineering Selection Recommendations

LP2981IM5-2.5/NOPB is a direct functional equivalent from National Semiconductor with identical electrical specifications and active product status. This part provides immediate substitution with no design modifications required.

MIC5225-2.5YM5-TR from Microchip Technology offers increased output current capability (150mA versus 100mA) while maintaining the same fixed 2.5V output and SOT-23-5 package. The higher dropout voltage (0.45V @ 150mA) must be evaluated against application power budget requirements. This part is suitable for designs requiring additional current margin or future scaling.

Both substitute parts carry active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment.

Frequently Asked Questions (FAQ)

Q: Can LP2981IM5-2.5/NOPB replace LP2981IM5-2.5 without circuit modifications?

A: Yes. Both parts share identical electrical specifications, output voltage, current rating, dropout voltage, and SOT-23-5 package configuration. No design changes are required.

Q: What is the primary difference between LP2981IM5-2.5 and MIC5225-2.5YM5-TR?

A: The MIC5225-2.5YM5-TR provides 150mA output current versus 100mA in the LP2981IM5-2.5, with a corresponding increase in dropout voltage from 0.37V to 0.45V at rated current. Both maintain 2.5V fixed output and SOT-23-5 packaging.

Q: Is MIC5225-2.5YM5-TR suitable for designs originally specified for LP2981IM5-2.5?

A: MIC5225-2.5YM5-TR is compatible if the application current requirement does not exceed 100mA and the additional dropout voltage does not violate power supply margin specifications. The higher current capability provides design flexibility without penalty in lower-current applications.

Q: Are all substitute parts available in the same package?

A: Yes. LP2981IM5-2.5/NOPB and MIC5225-2.5YM5-TR are both supplied in SOT-23-5 (SC-74A) packages, ensuring PCB layout compatibility.

Q: What is the difference between Cut Tape and Bulk packaging?

A: Cut Tape (CT) and Digi-Reel® are continuous reel formats for automated assembly. Bulk packaging indicates loose component quantities. Electrical and functional specifications remain identical across packaging formats.

Q: Do all substitute parts meet RoHS compliance?

A: LP2981IM5-2.5/NOPB compliance status is not specified in available data. MIC5225-2.5YM5-TR is ROHS3 compliant. Verify compliance documentation with the supplier for the specific part and manufacturing date code.