LP2951ACMX-3.3 Equivalent & Substitute Parts

Part Overview

The LP2951ACMX-3.3 is a linear voltage regulator IC from Texas Instruments, classified as a positive adjustable (fixed) output power management IC with 100mA output capability in an 8-SOIC surface mount package. This part is currently listed as obsolete, with 2165 pieces available in new original stock. The device provides regulated output at 3.3V with input voltage range up to 30V and includes integrated protection features for over-current, over-temperature, and short-circuit conditions.

Due to the obsolete status of the LP2951ACMX-3.3, identifying equivalent and substitute parts is necessary for ongoing production support, design continuity, and long-term component availability assurance.

Substiute Parts

LP2951ACMX-3.3

Texas InstrumentsIn Stock: 2221LP2951ACMX-3.3 Datasheet

Current PartRFQ

LP2951ACMX-3.3/NOPB

Texas InstrumentsIn Stock: 163442LP2951ACMX-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP2951CMX-3.3/NOPB

Texas InstrumentsIn Stock: 30192LP2951CMX-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP2951ACD-3.3R2G

onsemiIn Stock: 2633LP2951ACD-3.3R2G Datasheet

MFR RecommendedRFQ

LP2951CD-3.3R2G

onsemiIn Stock: 20321LP2951CD-3.3R2G Datasheet

MFR RecommendedRFQ

LP2951CS-L-3-3/TR

MaxLinear, Inc.In Stock: 7183LP2951CS-L-3-3/TR Datasheet

MFR RecommendedRFQ

NCV2951ACD3.3R2G

onsemiIn Stock: 2600NCV2951ACD3.3R2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP2951ACMX-3.3 are classified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

• Output voltage: 3.3V fixed output
• Output current capability: 100mA minimum
• Input voltage range: 30V maximum
• Package type: 8-SOIC surface mount
• Voltage dropout: 0.6V or lower @ 100mA
• Quiescent current: 120 µA nominal
• Operating temperature range: -40°C to 125°C
• Protection features: Over-current and over-temperature protection

Substitute Categories:

Category 1: Parametric Equivalents (Texas Instruments, Active Status) Parts LP2951ACMX-3.3/NOPB and LP2951CMX-3.3/NOPB maintain identical electrical specifications to the main part while offering active product status and improved RoHS3 compliance. These are direct functional replacements with identical packaging and performance characteristics.

Category 2: Manufacturer Recommended Equivalents (onsemi, Active Status) Parts LP2951ACD-3.3R2G and LP2951CD-3.3R2G are onsemi-manufactured equivalents with fixed 3.3V output. These parts meet all critical electrical parameters with slightly improved dropout voltage (0.45V @ 100mA) and reduced supply current (12mA vs. 14mA). Packaging remains 8-SOIC with identical mechanical compatibility.

Category 3: Alternative Manufacturer (MaxLinear, Active Status) Part LP2951CS-L-3-3/TR from MaxLinear, Inc. provides equivalent functionality with active product status. This part includes Enable control features and maintains all critical electrical specifications within acceptable tolerances.

Category 4: Automotive Grade Equivalent (onsemi, AEC-Q100) Part NCV2951ACD3.3R2G is the automotive-qualified variant from onsemi, suitable for applications requiring AEC-Q100 certification. Electrical specifications remain equivalent to the main part with automotive-grade reliability assurance.

Parameter Comparison

Engineering Selection Recommendations

For Standard Industrial Applications: LP2951ACMX-3.3/NOPB and LP2951CMX-3.3/NOPB from Texas Instruments are the primary substitutes. Both maintain active product status, identical electrical specifications, and improved ROHS3 compliance compared to the obsolete main part. These parts offer the highest compatibility with existing designs and supply chain continuity.

For Applications Requiring Improved Efficiency: LP2951ACD-3.3R2G and LP2951CD-3.3R2G from onsemi provide superior dropout voltage performance (0.45V vs. 0.6V) and reduced supply current (12mA vs. 14mA), resulting in lower power dissipation. Both maintain active product status and ROHS3 compliance. The primary difference is packaging format: LP2951ACD-3.3R2G is available in Cut Tape & Digi-Reel format, while LP2951CD-3.3R2G is supplied in Tape & Reel format.

For Applications with Enable Control Requirements: LP2951CS-L-3-3/TR from MaxLinear, Inc. includes Enable control features not present in the main part. This part maintains active status and RoHS compliance with equivalent electrical performance. Quiescent current is slightly elevated at 170 µA compared to 120 µA in other variants.

For Automotive and Safety-Critical Applications: NCV2951ACD3.3R2G from onsemi is the automotive-qualified equivalent with AEC-Q100 certification. This part is suitable for applications requiring automotive-grade reliability and qualification documentation. Electrical specifications remain equivalent to the main part with automotive-grade assurance.

Compliance Considerations: All substitute parts listed are ROHS3 compliant or RoHS compliant, addressing the non-compliance status of the obsolete main part. For new designs or production requiring regulatory compliance, any of the listed substitutes provide improved compliance posture.

Frequently Asked Questions (FAQ)

Q: Can LP2951ACMX-3.3/NOPB be used as a direct replacement for LP2951ACMX-3.3? A: Yes. LP2951ACMX-3.3/NOPB is a parametric equivalent with identical electrical specifications, output voltage, current rating, and package type. The primary differences are active product status and improved ROHS3 compliance. No circuit modifications are required.

Q: What is the difference between LP2951ACD-3.3R2G and LP2951CD-3.3R2G? A: Both parts are onsemi-manufactured equivalents with identical electrical specifications. The primary difference is packaging format: LP2951ACD-3.3R2G is supplied in Cut Tape & Digi-Reel format, while LP2951CD-3.3R2G is supplied in Tape & Reel format. Electrical performance and mechanical compatibility are identical.

Q: Why does LP2951CS-L-3-3/TR have higher quiescent current? A: LP2951CS-L-3-3/TR from MaxLinear includes Enable control features that contribute to the elevated quiescent current specification of 170 µA compared to 120 µA in other variants. This feature provides additional functionality for power management applications.

Q: Is NCV2951ACD3.3R2G suitable for non-automotive applications? A: Yes. NCV2951ACD3.3R2G maintains identical electrical specifications to other substitutes and can be used in standard industrial applications. The automotive qualification (AEC-Q100) provides additional reliability assurance without restricting use in non-automotive designs.

Q: What are the key parameters that determine substitution compatibility? A: Substitution compatibility is determined by: fixed 3.3V output voltage, 100mA output current capability, 30V maximum input voltage, 8-SOIC package type, dropout voltage performance, quiescent current specifications, and operating temperature range of -40°C to 125°C. All listed substitutes meet these criteria.

Q: Are there any circuit modifications required when switching from LP2951ACMX-3.3 to a substitute part? A: No circuit modifications are required. All substitute parts maintain identical pin configuration, electrical specifications, and functional behavior. Direct PCB-level replacement is supported without design changes.

Q: Which substitute offers the best power efficiency? A: LP2951ACD-3.3R2G and LP2951CD-3.3R2G offer superior power efficiency with 0.45V dropout voltage (compared to 0.6V in the main part) and reduced supply current of 12mA (compared to 14mA). These improvements result in lower power dissipation in battery-powered or thermally constrained applications.

Q: What is the MSL rating for all substitute parts? A: All substitute parts maintain MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions for storage and handling.