LP2981IM5X-2.5 Equivalent & Substitute Parts

Part Overview

The LP2981IM5X-2.5 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed 2.5V output at 100mA in a surface-mount SOT-23-5 package. The part is currently listed as obsolete, making identification of equivalent and substitute components essential for ongoing design support, production continuity, and legacy system maintenance.

Substiute Parts

LP2981IM5X-2.5

Texas InstrumentsIn Stock: 41341LP2981IM5X-2.5 Datasheet

Current PartRFQ

LP2981IM5-2.5/NOPB

National SemiconductorIn Stock: 1817LP2981IM5-2.5/NOPB Datasheet

Parametric EquivalentRFQ

MIC5205-2.5YM5-TR

Microchip TechnologyIn Stock: 11766MIC5205-2.5YM5-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP2981IM5X-2.5 are identified based on strict parametric equivalence within the following critical criteria:

• Fixed output voltage of 2.5V
• Output current capability of 100mA or greater
• Maximum input voltage of 16V or greater
• SOT-23-5 package compatibility
• Operating temperature range of -40°C to 125°C or wider
• Positive output configuration with fixed output type
• Enable control feature and protection features (Over Current, Over Temperature, Short Circuit)

Two substitute parts meet these requirements: the LP2981IM5-2.5/NOPB (parametric equivalent from National Semiconductor) and the MIC5205-2.5YM5-TR (manufacturer-recommended substitute from Microchip Technology).

Parameter Comparison

Engineering Selection Recommendations

The LP2981IM5-2.5/NOPB serves as the parametric equivalent, offering identical electrical specifications and package compatibility with active product status. This part is suitable for direct replacement in applications where the original LP2981IM5X-2.5 specifications are required.

The MIC5205-2.5YM5-TR functions as a manufacturer-recommended substitute with enhanced performance characteristics. It provides higher output current capability (150mA versus 100mA), improved voltage dropout performance (0.35V versus 0.37V), and superior PSRR (75dB versus 63dB). Both substitute parts maintain SOT-23-5 package compatibility and identical operating temperature ranges. The MIC5205-2.5YM5-TR carries ROHS3 compliance certification, matching the original part's regulatory status.

Frequently Asked Questions (FAQ)

Q: Can the LP2981IM5-2.5/NOPB be used as a direct replacement for the LP2981IM5X-2.5?

A: Yes. The LP2981IM5-2.5/NOPB is a parametric equivalent with identical output voltage, current rating, input voltage range, dropout voltage, quiescent current, and package configuration. Both parts share the same control features and protection mechanisms.

Q: What are the advantages of using the MIC5205-2.5YM5-TR over the LP2981IM5-2.5/NOPB?

A: The MIC5205-2.5YM5-TR provides higher output current capability (150mA), lower dropout voltage (0.35V), and higher PSRR (75dB). These enhancements offer improved performance headroom in power-sensitive applications, though both parts are functionally compatible in circuits designed for the original 100mA specification.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the SOT-23-5 package configuration, ensuring mechanical and electrical pin compatibility for PCB layouts designed for the LP2981IM5X-2.5.

Q: What is the difference between the LP2981IM5X-2.5 and LP2981IM5-2.5/NOPB part numbers?

A: The suffix designations indicate packaging and lead finish variations. Both parts are from the LP2981 series with identical electrical specifications. The LP2981IM5-2.5/NOPB is available in bulk packaging, while the original part number reflects a different packaging configuration.

Q: Are there any compliance or certification differences between the substitute parts?

A: The LP2981IM5-2.5/NOPB compliance status is not specified in available documentation. The MIC5205-2.5YM5-TR carries ROHS3 compliance, matching the original LP2981IM5X-2.5. Both parts are EAR99 classified and REACH unaffected.

Q: Which substitute part should be selected for new designs?

A: Selection depends on application requirements. For designs requiring the original 100mA specification with equivalent performance, the LP2981IM5-2.5/NOPB is appropriate. For applications benefiting from higher current capability and improved performance margins, the MIC5205-2.5YM5-TR is recommended. Both parts are active products with established supply chains.