LP2951ACMX-3.0 Equivalent & Substitute Parts

Part Overview

The LP2951ACMX-3.0 is a linear voltage regulator IC from Texas Instruments, classified as a positive adjustable (fixed) output power management device. This 8-SOIC surface mount component delivers 100mA output current with input voltage capability up to 30V and adjustable output voltage range from 1.235V to 29V. The device integrates over-current, over-temperature, and short-circuit protection with an enable control feature.

The LP2951ACMX-3.0 carries an obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and access components with active manufacturing status and improved compliance certifications.

Substiute Parts

LP2951ACMX-3.0

Texas InstrumentsIn Stock: 8179LP2951ACMX-3.0 Datasheet

Current PartRFQ

LP2951ACMX-3.0/NOPB

Texas InstrumentsIn Stock: 2638LP2951ACMX-3.0/NOPB Datasheet

Parametric EquivalentRFQ

LP2951CMX-3.0/NOPB

Texas InstrumentsIn Stock: 4209LP2951CMX-3.0/NOPB Datasheet

Parametric EquivalentRFQ

LP2951ACD-3.0R2G

onsemiIn Stock: 6361LP2951ACD-3.0R2G Datasheet

MFR RecommendedRFQ

LP2951CD-3.0G

onsemiIn Stock: 975LP2951CD-3.0G Datasheet

MFR RecommendedRFQ

LP2951CD-3.0R2G

onsemiIn Stock: 8558LP2951CD-3.0R2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LP2951ACMX-3.0 is determined by strict alignment with the following critical parameters:

Mandatory Matching Parameters:

• Output Configuration: Positive
• Number of Regulators: 1
• Voltage - Input (Max): 30V
• Current - Output: 100mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Allowable Variation Parameters:

• Output Type: Adjustable (Fixed) variants acceptable
• Voltage - Output (Min/Fixed): 1.235V or 3V fixed output acceptable
• Voltage Dropout (Max): 0.45V to 0.6V acceptable
• Current - Quiescent (Iq): 120 µA standard
• Current - Supply (Max): 12 mA to 14 mA acceptable
• Control Features: Enable feature or absence acceptable
• Protection Features: Over Current and Over Temperature minimum; Short Circuit optional
• RoHS Status: ROHS3 Compliant preferred over non-compliant
• Product Status: Active status preferred over obsolete

Substitute parts are grouped by parametric equivalence and product status. Texas Instruments LP2951 variants with active status and ROHS3 compliance are primary substitutes. onsemi LP2951 variants with fixed 3V output are secondary substitutes, suitable for applications requiring fixed voltage regulation.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Texas Instruments, Active Status, ROHS3 Compliant):

LP2951ACMX-3.0/NOPB and LP2951CMX-3.0/NOPB are direct parametric equivalents with active product status and ROHS3 compliance. These parts maintain identical electrical specifications including adjustable output voltage range (1.235V to 29V), 0.6V maximum dropout voltage, and full protection feature set. The primary distinction is packaging format: LP2951ACMX-3.0/NOPB is supplied in Tape & Reel format, while LP2951CMX-3.0/NOPB is supplied in Cut Tape & Digi-Reel format. Selection between these variants depends on assembly process requirements and inventory management preferences.

Secondary Substitutes (onsemi, Active Status, ROHS3 Compliant, Fixed 3V Output):

LP2951ACD-3.0R2G and LP2951CD-3.0R2G are onsemi-manufactured alternatives with fixed 3V output configuration. These parts are suitable for applications where adjustable output voltage is not required and the fixed 3V output meets system requirements. Both variants offer improved dropout voltage performance (0.45V maximum versus 0.6V) and reduced maximum supply current (12 mA versus 14 mA). LP2951ACD-3.0R2G is supplied in Cut Tape format with active product status. LP2951CD-3.0R2G is also supplied in Cut Tape format with active product status.

Obsolete Variant (Not Recommended for New Designs):

LP2951CD-3.0G carries obsolete product status and should not be selected for new designs despite ROHS3 compliance and improved electrical performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can LP2951ACMX-3.0/NOPB directly replace LP2951ACMX-3.0?

A: Yes. LP2951ACMX-3.0/NOPB is a parametric equivalent with identical electrical specifications. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 versus non-compliant). The "/NOPB" suffix indicates lead-free plating. Packaging format differs: LP2951ACMX-3.0/NOPB is supplied in Tape & Reel format.

Q: What is the difference between LP2951CMX-3.0/NOPB and LP2951ACMX-3.0/NOPB?

A: Both parts are Texas Instruments LP2951 variants with identical electrical specifications and active product status. The distinction is packaging format: LP2951CMX-3.0/NOPB is supplied in Cut Tape & Digi-Reel format, while LP2951ACMX-3.0/NOPB is supplied in Tape & Reel format. Selection depends on assembly equipment compatibility and supply chain logistics.

Q: Can onsemi LP2951ACD-3.0R2G or LP2951CD-3.0R2G replace the adjustable output LP2951ACMX-3.0?

A: onsemi variants are suitable only if your application requires fixed 3V output regulation. These parts cannot provide adjustable output voltage from 1.235V to 29V. If adjustable output is a design requirement, onsemi variants are not compatible. If fixed 3V output meets system requirements, onsemi variants offer improved dropout voltage performance (0.45V versus 0.6V).

Q: What is the significance of the packaging format differences?

A: Packaging format (Tape & Reel, Cut Tape, Tube) affects assembly process compatibility and inventory management. Tape & Reel format is optimized for high-volume automated assembly. Cut Tape format is suitable for moderate-volume production and manual assembly. Tube packaging is used for lower-volume applications. Electrical performance is identical across packaging formats for the same part number variant.

Q: Are all substitute parts RoHS compliant?

A: All recommended substitute parts carry ROHS3 compliance certification. The original LP2951ACMX-3.0 is RoHS non-compliant. If RoHS compliance is a design requirement, LP2951ACMX-3.0/NOPB, LP2951CMX-3.0/NOPB, LP2951ACD-3.0R2G, or LP2951CD-3.0R2G are suitable alternatives.

Q: Why should LP2951CD-3.0G be avoided despite its specifications?

A: LP2951CD-3.0G carries obsolete product status. While it meets electrical and compliance requirements, obsolete components present supply chain risk and may have limited availability. Active-status alternatives (LP2951ACD-3.0R2G or LP2951CD-3.0R2G) are preferred for new designs and long-term production support.

Q: What are the key parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: output configuration (positive), number of regulators (1), maximum input voltage (30V), output current (100mA), operating temperature range (-40°C to 125°C), surface mount mounting type, 8-SOIC package, and MSL rating (1). Output type (adjustable versus fixed) and specific output voltage range determine functional compatibility with system requirements. Voltage dropout, quiescent current, and protection features may vary within acceptable ranges.