LP2951ACMM Equivalent & Substitute Parts

Part Overview

The LP2951ACMM is a linear voltage regulator IC from Texas Instruments designed for positive adjustable (fixed) output applications. This Power Management (PMIC) device delivers 100mA output current in an 8-VSSOP surface mount package. The main part carries a Last Time Buy product status, making identification of equivalent and substitute parts essential for design continuity and procurement planning.

Substiute Parts

LP2951ACMM

Texas InstrumentsIn Stock: 29856LP2951ACMM Datasheet

Current PartRFQ

LP2951ACMM/NOPB

Texas InstrumentsIn Stock: 27189LP2951ACMM/NOPB Datasheet

DirectRFQ

LP2951ACMMX/NOPB

Texas InstrumentsIn Stock: 6414LP2951ACMMX/NOPB Datasheet

Parametric EquivalentRFQ

LP2951CMM/NOPB

Texas InstrumentsIn Stock: 12086LP2951CMM/NOPB Datasheet

Parametric EquivalentRFQ

LP2951CMMX/NOPB

Texas InstrumentsIn Stock: 1797LP2951CMMX/NOPB Datasheet

Parametric EquivalentRFQ

NCV2951ACDR2G

onsemiIn Stock: 8591NCV2951ACDR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP2951ACMM are classified based on strict parameter matching across electrical and mechanical specifications. The substitution logic is based on the following critical parameters:

• Output configuration (Positive)
• Output type (Adjustable/Fixed)
• Number of regulators (1)
• Maximum input voltage (30V)
• Output voltage range (1.235V to 29V)
• Output current capability (100mA)
• Protection features (Over Current, Over Temperature, Short Circuit)
• Operating temperature range (-40°C ~ 125°C)
• Surface mount packaging compatibility

Substitute parts are grouped into three categories:

Direct Manufacturer Substitutes (Texas Instruments): Parts with identical electrical specifications and packaging, differing only in packaging format (Cut Tape vs. Tape & Reel) or minor part number suffixes.

Parametric Equivalents (Texas Instruments): Parts maintaining all critical electrical parameters with identical package specifications.

Manufacturer Recommended Equivalent (onsemi): Cross-manufacturer alternative meeting core electrical requirements with different package type (8-SOIC vs. 8-VSSOP).

Parameter Comparison

Engineering Selection Recommendations

Texas Instruments LP2951 Series (Direct Substitutes):

LP2951ACMM/NOPB, LP2951ACMMX/NOPB, LP2951CMM/NOPB, and LP2951CMMX/NOPB are all Active product status alternatives to the Last Time Buy LP2951ACMM. These parts maintain identical electrical specifications and are available in higher quantities. Selection among these variants depends on packaging format requirements: Cut Tape (CT) & Digi-Reel® for LP2951ACMM/NOPB and LP2951CMMX/NOPB, or Tape & Reel (TR) for LP2951CMM/NOPB. The "X" suffix variants (LP2951ACMMX/NOPB, LP2951CMMX/NOPB) indicate extended temperature or processing options within the same electrical performance envelope.

onsemi NCV2951ACDR2G (Cross-Manufacturer Alternative):

The NCV2951ACDR2G from onsemi provides equivalent electrical functionality with Active product status and automotive-grade qualification (AEC-Q100). This part differs in package type (8-SOIC vs. 8-VSSOP), requiring PCB layout modification. The NCV2951ACDR2G offers improved dropout voltage (0.45V vs. 0.6V @ 100mA) and slightly higher maximum output voltage (30V vs. 29V). This option is suitable for designs where package footprint change is acceptable and automotive-grade reliability is beneficial.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LP2951ACMM with LP2951ACMM/NOPB?

A: Yes. LP2951ACMM/NOPB is a direct substitute with identical electrical specifications. The primary difference is packaging format (Cut Tape & Digi-Reel® vs. the original format) and Active product status, making it suitable for new procurement.

Q: What is the difference between LP2951ACMMX/NOPB and LP2951ACMM/NOPB?

A: Both parts maintain identical core electrical parameters. The "X" suffix indicates a variant within the LP2951 family, typically representing extended processing or qualification options. Electrical performance for regulator operation remains equivalent.

Q: Can I use NCV2951ACDR2G as a drop-in replacement?

A: NCV2951ACDR2G is not a drop-in replacement due to package type difference (8-SOIC vs. 8-VSSOP). PCB layout and footprint redesign is required. However, electrical functionality is equivalent, with improved dropout voltage performance.

Q: Why does NCV2951ACDR2G have lower dropout voltage?

A: The NCV2951ACDR2G is specified with 0.45V dropout at 100mA compared to 0.6V for the LP2951 series. This is a characteristic difference between the onsemi and Texas Instruments implementations of equivalent regulator architectures.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 Compliant status with Moisture Sensitivity Level 1 (Unlimited), matching the original LP2951ACMM compliance profile.

Q: Which substitute should I choose for high-volume production?

A: LP2951ACMM/NOPB or LP2951CMM/NOPB are recommended for high-volume production, as both are Active status parts with substantial inventory availability and identical electrical specifications to the original part.

Q: Does package selection affect circuit performance?

A: Package selection (8-VSSOP vs. 8-SOIC) does not affect electrical performance but requires different PCB footprints and layout considerations. Thermal characteristics may vary slightly between packages, though both are rated for identical operating temperature ranges.