LP2951CMM-3.3 Equivalent & Substitute Parts

Part Overview

The LP2951CMM-3.3 is a linear voltage regulator IC from Texas Instruments, classified as a positive adjustable (fixed) output power management component. This 8-VSSOP surface mount device delivers 100mA output current with a fixed 3.3V output configuration. The main part number is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

LP2951CMM-3.3

Texas InstrumentsIn Stock: 3507LP2951CMM-3.3 Datasheet

Current PartRFQ

LP2951ACMM-3.3/NOPB

Texas InstrumentsIn Stock: 2251LP2951ACMM-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP2951ACMMX-3.3/NOPB

Texas InstrumentsIn Stock: 2480LP2951ACMMX-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP2951CMM-3.3/NOPB

Texas InstrumentsIn Stock: 6008LP2951CMM-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP2951CMMX-3.3/NOPB

Texas InstrumentsIn Stock: 2793LP2951CMMX-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP2951ACDM-3.0R2G

onsemiIn Stock: 1037LP2951ACDM-3.0R2G Datasheet

MFR RecommendedRFQ

LP2951ACDM-3.3RG

onsemiIn Stock: 4483LP2951ACDM-3.3RG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LP2951CMM-3.3 is determined by strict parametric equivalence across the following critical criteria:

Primary Substitution Criteria:

• Output configuration: Positive
• Output type: Adjustable (Fixed)
• Number of regulators: 1
• Voltage input maximum: 30V
• Voltage output fixed: 3.3V
• Current output: 100mA
• Voltage dropout: 0.6V @ 100mA
• Operating temperature range: -40°C ~ 125°C
• Package type: 8-VSSOP / 8-MSOP
• Mounting type: Surface Mount
• Protection features: Over Current, Over Temperature, Short Circuit

Parametric Equivalent Parts (Texas Instruments LP2951 series, Active status):

• LP2951ACMM-3.3/NOPB
• LP2951ACMMX-3.3/NOPB
• LP2951CMM-3.3/NOPB
• LP2951CMMX-3.3/NOPB

These parts maintain identical electrical specifications and package compatibility. Differences exist only in packaging format (Cut Tape, Digi-Reel, or Tape & Reel) and product status (Active vs. Obsolete).

Manufacturer Recommended Alternative (onsemi LP2951 series):

• LP2951ACDM-3.3RG

This part is from onsemi and shares the same base product number (LP2951) with identical core electrical parameters. The primary distinction is the manufacturer source and fixed output type designation.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred): Select LP2951CMM-3.3/NOPB, LP2951ACMM-3.3/NOPB, LP2951ACMMX-3.3/NOPB, or LP2951CMMX-3.3/NOPB. These Texas Instruments parts maintain full parametric equivalence with the obsolete LP2951CMM-3.3. All substitute options carry Active product status and ROHS3 compliance, addressing the RoHS non-compliance limitation of the original part. Selection among these four variants depends on packaging requirements: Cut Tape (CT) & Digi-Reel for ACMM-3.3/NOPB and CMMX-3.3/NOPB variants, or Tape & Reel (TR) for CMM-3.3/NOPB and ACMMX-3.3/NOPB variants.

For Cross-Manufacturer Substitution: The LP2951ACDM-3.3RG from onsemi is a manufacturer-recommended alternative. This part shares the LP2951 base product number and maintains electrical compatibility across all critical parameters: 100mA output current, 3.3V fixed output, 30V maximum input voltage, and -40°C to 125°C operating temperature range. The onsemi variant exhibits improved voltage dropout performance (0.45V vs. 0.6V @ 100mA) and lower maximum supply current (12mA vs. 14mA). Short Circuit protection is not listed for the onsemi part, whereas the Texas Instruments variants include this feature. The onsemi part carries AEC-Q100 automotive qualification and ROHS3 compliance.

Compliance Considerations: All recommended substitutes are ROHS3 compliant, addressing the RoHS non-compliance status of the original LP2951CMM-3.3. All parts maintain MSL Level 1 (Unlimited) moisture sensitivity rating and REACH Unaffected status.

Frequently Asked Questions (FAQ)

Q: Can LP2951ACMM-3.3/NOPB directly replace LP2951CMM-3.3? A: Yes. Both parts are Texas Instruments LP2951 series linear voltage regulators with identical electrical specifications: 3.3V fixed output, 100mA output current, 30V maximum input voltage, 0.6V dropout at 100mA, and -40°C to 125°C operating temperature. The primary difference is product status (Active vs. Obsolete) and packaging format. Pin-to-pin compatibility and functional equivalence are confirmed.

Q: What is the difference between the four Texas Instruments substitute options? A: LP2951CMM-3.3/NOPB and LP2951ACMMX-3.3/NOPB are supplied in Tape & Reel (TR) packaging. LP2951ACMM-3.3/NOPB and LP2951CMMX-3.3/NOPB are supplied in Cut Tape (CT) & Digi-Reel packaging. All four maintain identical electrical parameters and 8-VSSOP package specifications. Selection depends on procurement and assembly requirements.

Q: Is the onsemi LP2951ACDM-3.3RG a suitable substitute? A: The onsemi LP2951ACDM-3.3RG is a manufacturer-recommended alternative with full parametric compatibility for the core application: 3.3V output, 100mA current, 30V input maximum, and identical operating temperature range. The onsemi variant offers improved dropout voltage (0.45V vs. 0.6V) and lower supply current (12mA vs. 14mA). However, it does not include Short Circuit protection, whereas Texas Instruments variants provide this feature. Verify application requirements for Short Circuit protection before selecting the onsemi part.

Q: Are all substitute parts RoHS compliant? A: Yes. All recommended substitutes carry ROHS3 compliance. The original LP2951CMM-3.3 is RoHS non-compliant. This compliance upgrade is a key advantage of transitioning to any of the recommended substitute parts.

Q: What is the package compatibility between substitute parts? A: All substitute parts use the 8-VSSOP / 8-MSOP package with 0.118" width (3.00mm). Pin count, pitch, and physical dimensions are identical across all variants. PCB layout and footprint modifications are not required for substitution.

Q: Can I mix packaging formats in production? A: Yes. All four Texas Instruments substitute variants maintain identical electrical specifications and package pinout. Mixing Cut Tape and Tape & Reel formats is permissible from an electrical and mechanical standpoint, though procurement and assembly processes may impose restrictions based on handling and automation requirements.