LP2951CDM-3.0R2G Equivalent & Substitute Parts

Part Overview

The LP2951CDM-3.0R2G is a linear voltage regulator IC from onsemi, classified as a Power Management (PMIC) component. It delivers a fixed positive 3V output at 100mA with a maximum dropout voltage of 0.45V. The device is housed in an 8-MSOP package and includes integrated over-current and over-temperature protection.

This part is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this regulator topology.

Substiute Parts

LP2951CDM-3.0R2G

onsemiIn Stock: 818LP2951CDM-3.0R2G Datasheet

Current PartRFQ

LP2951ACDM-3.0R2G

onsemiIn Stock: 1037LP2951ACDM-3.0R2G Datasheet

SimilarRFQ

LP2951ACDM-3.0RG

onsemiIn Stock: 4937LP2951ACDM-3.0RG Datasheet

Parametric EquivalentRFQ

LP2951ACMM-3.0/NOPB

Texas InstrumentsIn Stock: 3169LP2951ACMM-3.0/NOPB Datasheet

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LP2951ACMMX-3.0/NOPB

Texas InstrumentsIn Stock: 4630LP2951ACMMX-3.0/NOPB Datasheet

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LP2951CMM-3.0/NOPB

Texas InstrumentsIn Stock: 11276LP2951CMM-3.0/NOPB Datasheet

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LP2951CMMX-3.0/NOPB

Texas InstrumentsIn Stock: 7160LP2951CMMX-3.0/NOPB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP2951CDM-3.0R2G are identified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

• Output Configuration: Positive
• Output Type: Fixed (3V nominal)
• Number of Regulators: 1
• Voltage - Input (Max): 30V
• Voltage - Output (Min/Fixed): 3V
• Current - Output: 100mA
• Current - Quiescent (Iq): 120 µA
• Operating Temperature Range: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP compatible footprint
• Protection Features: Over Current, Over Temperature

Substitution Categories:

Category 1: Direct Parametric Equivalents (onsemi) Parts that match all critical electrical parameters and maintain identical package specifications. These parts are pin-compatible and functionally interchangeable without circuit modification.

Category 2: Functional Equivalents with Enhanced Features (onsemi) Parts that meet all critical electrical parameters but include additional control features (Enable function) and automotive-grade qualification. These parts are pin-compatible and provide equivalent or superior performance.

Category 3: Functional Equivalents with Packaging Variants (Texas Instruments) Parts that meet all critical electrical parameters but are supplied by Texas Instruments. These parts maintain electrical compatibility and package compatibility but may have minor variations in control features and protection specifications.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (onsemi sourcing):

LP2951ACDM-3.0RG is the primary recommended substitute. This part is in active production status, maintains identical electrical specifications and package compatibility, and is available in high volume (4,864 pcs). It provides the most direct path for design continuity with the obsolete LP2951CDM-3.0R2G.

LP2951ACDM-3.0R2G is an alternative onsemi option with automotive-grade qualification (AEC-Q100) and Enable control feature. This part is suitable for applications requiring automotive compliance or where enable/disable functionality is beneficial. Product status is active with adequate inventory (982 pcs).

For Multi-Source Strategy (Texas Instruments alternatives):

LP2951CMM-3.0/NOPB, LP2951CMMX-3.0/NOPB, LP2951ACMM-3.0/NOPB, and LP2951ACMMX-3.0/NOPB are functionally equivalent parts from Texas Instruments. These parts meet all critical electrical parameters and maintain 8-MSOP package compatibility. All are in active production with substantial inventory levels (3,100 to 11,200 pcs).

Texas Instruments variants include Enable control features and enhanced short-circuit protection. The dropout voltage specification is 0.6V @ 100mA compared to 0.45V for onsemi parts, and maximum supply current is 14 mA versus 12 mA. These differences are within acceptable tolerance for most applications but should be verified against specific circuit requirements.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and identical operating temperature range (-40°C ~ 125°C). No additional qualification or compliance work is required for substitution.

Frequently Asked Questions (FAQ)

Q: Can LP2951ACDM-3.0RG be used as a direct replacement for LP2951CDM-3.0R2G?

A: Yes. LP2951ACDM-3.0RG is pin-compatible and electrically equivalent. Both parts deliver 3V fixed output at 100mA with identical dropout voltage (0.45V @ 100mA), quiescent current (120 µA), and operating temperature range (-40°C ~ 125°C). The primary difference is product status: LP2951ACDM-3.0RG is in active production while the original part is obsolete.

Q: What is the difference between onsemi and Texas Instruments LP2951 variants?

A: Both manufacturers produce functionally equivalent parts within the LP2951 family. Key differences are: onsemi parts (LP2951ACDM-3.0RG) specify 0.45V maximum dropout voltage, while Texas Instruments parts (LP2951CMM-3.0/NOPB series) specify 0.6V. Texas Instruments variants include Enable control features and short-circuit protection as standard. Maximum supply current is 12 mA for onsemi versus 14 mA for Texas Instruments. All parts maintain identical 100mA output current, 3V fixed output, and 8-MSOP package compatibility.

Q: Are the Enable control features on Texas Instruments parts compatible with designs that do not use this function?

A: Yes. The Enable pin on Texas Instruments variants can be tied to VCC or left floating without affecting regulator operation. Designs that do not require enable/disable functionality will operate identically to fixed-output-only parts.

Q: What packaging options are available for substitute parts?

A: All substitute parts are supplied in 8-MSOP surface-mount packages with identical footprint dimensions (0.118", 3.00mm width). Packaging variants include Cut Tape (CT), Digi-Reel, and Tape & Reel (TR) options. Verify specific packaging availability with your supplier based on procurement requirements.

Q: Is the 0.15V difference in dropout voltage (0.45V vs 0.6V) significant for my application?

A: Dropout voltage significance depends on your input voltage margin and load current. At 100mA output current, onsemi parts (0.45V dropout) require 3.45V minimum input for 3V output, while Texas Instruments parts (0.6V dropout) require 3.6V minimum input. Verify your circuit's input voltage specification against these requirements. If input voltage is constrained, onsemi parts provide better performance.

Q: Can I use LP2951ACDM-3.0R2G (automotive-grade) in non-automotive applications?

A: Yes. Automotive-grade parts exceed standard industrial specifications and are fully compatible with non-automotive designs. AEC-Q100 qualification ensures enhanced reliability and temperature cycling performance. Using automotive-grade parts in standard applications introduces no compatibility issues and may provide additional design margin.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL Level 1 (unlimited moisture sensitivity) rating. No additional environmental or compliance qualification is required for substitution.