LP2951ACMM-3.3 Equivalent & Substitute Parts

Part Overview

The LP2951ACMM-3.3 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This positive adjustable (fixed) output regulator delivers 100mA with a fixed output of 3.3V and supports input voltages up to 30V. The main part is currently in Last Time Buy status, making identification of active equivalent and substitute parts essential for ongoing design support and procurement planning.

Substiute Parts

LP2951ACMM-3.3

Texas InstrumentsIn Stock: 241525LP2951ACMM-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-3.3RG

onsemiIn Stock: 4483LP2951ACDM-3.3RG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP2951ACMM-3.3 are classified into two categories based on substitution criteria:

Parametric Equivalents (Texas Instruments LP2951 Series - Active Status)

These parts maintain identical electrical and mechanical specifications to the main part:

• Output Configuration: Positive
• Output Type: Adjustable (Fixed)
• Voltage - Input (Max): 30V
• Voltage - Output (Min/Fixed): 1.235V (3.3V)
• Voltage - Output (Max): 29V
• Voltage Dropout (Max): 0.6V @ 100mA
• Current - Output: 100mA
• Current - Quiescent (Iq): 120 µA
• Current - Supply (Max): 14 mA
• Protection Features: Over Current, Over Temperature, Short Circuit
• Operating Temperature: -40°C ~ 125°C (TJ)
• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Differences exist only in packaging format (Cut Tape, Digi-Reel, or Tape & Reel) and product status (Active vs. Last Time Buy).

Manufacturer Recommended Substitute (onsemi LP2951ACDM-3.3RG)

This part is from an alternative manufacturer (onsemi) and differs in the following parameters:

• Output Type: Fixed (vs. Adjustable/Fixed)
• Voltage Dropout (Max): 0.45V @ 100mA (vs. 0.6V @ 100mA)
• Current - Supply (Max): 12 mA (vs. 14 mA)
• Control Features: None listed (vs. Enable)
• Protection Features: Over Current, Over Temperature (vs. Over Current, Over Temperature, Short Circuit)
• Supplier Device Package: 8-MSOP (vs. 8-VSSOP)

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred)

Select from the Texas Instruments LP2951 parametric equivalents: LP2951ACMM-3.3/NOPB, LP2951ACMMX-3.3/NOPB, LP2951CMM-3.3/NOPB, or LP2951CMMX-3.3/NOPB. All maintain identical electrical specifications and are in Active product status. Selection among these variants depends on packaging requirements: Cut Tape (CT) & Digi-Reel for LP2951ACMM-3.3/NOPB and LP2951CMMX-3.3/NOPB, or Tape & Reel (TR) for LP2951ACMMX-3.3/NOPB and LP2951CMM-3.3/NOPB.

For Alternative Manufacturer Substitution

The onsemi LP2951ACDM-3.3RG is a manufacturer-recommended substitute with the following considerations:

• Improved voltage dropout performance (0.45V vs. 0.6V @ 100mA)
• Reduced supply current (12 mA vs. 14 mA)
• Absence of short circuit protection (includes only Over Current and Over Temperature)
• Absence of Enable control feature
• Fixed output type (not adjustable)

This part is suitable only for applications where the fixed 3.3V output and reduced protection feature set are acceptable.

Compliance & Regulatory

All substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited), REACH Unaffected status, and identical operating temperature range (-40°C ~ 125°C). No regulatory barriers exist for substitution within the Texas Instruments LP2951 series.

Frequently Asked Questions (FAQ)

Q: Can LP2951ACMM-3.3/NOPB be used as a direct replacement for LP2951ACMM-3.3?

A: Yes. Both parts are identical in electrical and mechanical specifications. The difference is packaging format (Cut Tape & Digi-Reel vs. standard packaging) and product status (Active vs. Last Time Buy). The /NOPB suffix indicates lead-free, RoHS-compliant packaging.

Q: What is the difference between LP2951ACMMX-3.3/NOPB and LP2951CMM-3.3/NOPB?

A: Both parts have identical electrical specifications. The difference is in the device marking code (A vs. C prefix) and packaging format. LP2951ACMMX-3.3/NOPB is supplied in Tape & Reel (TR) format, while LP2951CMM-3.3/NOPB is also Tape & Reel. Consult the manufacturer datasheet for marking code implications.

Q: Is the onsemi LP2951ACDM-3.3RG a suitable substitute?

A: The onsemi part is electrically compatible for applications requiring a fixed 3.3V output. However, it differs in three key areas: (1) it lacks short circuit protection, (2) it has no Enable control feature, and (3) it exhibits lower voltage dropout (0.45V vs. 0.6V). Use this part only if your application does not require these features.

Q: What packaging options are available for the LP2951 series?

A: All substitute parts use the same physical package: 8-TSSOP or 8-MSOP (0.118", 3.00mm Width). Differences exist only in supply format: Cut Tape (CT) & Digi-Reel, or Tape & Reel (TR). PCB footprint compatibility is identical across all variants.

Q: Are there any temperature or compliance differences between substitute parts?

A: No. All substitute parts maintain identical operating temperature range (-40°C ~ 125°C), ROHS3 compliance, MSL Level 1, and REACH Unaffected status. No thermal or regulatory barriers exist for substitution.

Q: Why is the main part LP2951ACMM-3.3 in Last Time Buy status?

A: Last Time Buy status indicates the manufacturer is discontinuing this specific part number variant. Active equivalent part numbers (with /NOPB suffix or alternative packaging codes) remain available for procurement and should be used for new designs and ongoing production.