LP2951ACMMX-3.3 Equivalent & Substitute Parts

Part Overview

The LP2951ACMMX-3.3 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device provides positive adjustable (fixed) output regulation at 100mA output current in an 8-VSSOP surface mount package. The main part number is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing production and design updates. Active alternatives with identical or compatible electrical specifications are available from Texas Instruments and onsemi.

Key Parameters

Parameter	Value
Output Configuration	Positive
Output Type	Adjustable (Fixed)
Number of Regulators	1
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
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C (TJ)
Mounting Type	Surface Mount
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Supplier Device Package	8-VSSOP
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LP2951ACMMX-3.3 are classified based on the following substitution criteria:

Direct Manufacturer Equivalents (Same Manufacturer, Active Status):

LP2951ACMMX-3.3/NOPB: Identical electrical specifications and package. Differs only in packaging format (Tape & Reel vs. bulk) and RoHS compliance status (ROHS3 Compliant vs. non-compliant).

Parametric Equivalents (Same Manufacturer, Active Status):

LP2951ACMM-3.3/NOPB: Identical electrical specifications. Packaging format is Cut Tape & Digi-Reel®.
LP2951CMM-3.3/NOPB: Identical electrical specifications. Packaging format is Tape & Reel.
LP2951CMMX-3.3/NOPB: Identical electrical specifications. Packaging format is Cut Tape & Digi-Reel®.

MFR Recommended Equivalent (Alternative Manufacturer):

LP2951ACDM-3.3RG (onsemi): Shares the same base product number (LP2951) and identical output current (100mA), input voltage range (30V max), and operating temperature range. Output type is fixed (not adjustable). Voltage dropout is 0.45V @ 100mA (lower than main part). Supplied in 8-MSOP package. Manufacturer is onsemi instead of Texas Instruments.

All substitute parts maintain the same electrical performance envelope for the critical parameters: output current (100mA), input voltage tolerance (30V max), operating temperature range (-40°C ~ 125°C), and protection features (Over Current, Over Temperature, Short Circuit).

Parameter Comparison

Parameter	LP2951ACMMX-3.3	LP2951ACMMX-3.3/NOPB	LP2951ACMM-3.3/NOPB	LP2951CMM-3.3/NOPB	LP2951CMMX-3.3/NOPB	LP2951ACDM-3.3RG
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	onsemi
Product Status	Obsolete	Active	Active	Active	Active	Active
Output Configuration	Positive	Positive	Positive	Positive	Positive	Positive
Output Type	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)	Fixed
Voltage - Input (Max)	30V	30V	30V	30V	30V	30V
Voltage - Output (Min/Fixed)	1.235V (3.3V)	1.235V (3.3V)	1.235V (3.3V)	1.235V (3.3V)	1.235V (3.3V)	3.3V
Voltage Dropout (Max)	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.45V @ 100mA
Current - Output	100mA	100mA	100mA	100mA	100mA	100mA
Current - Quiescent (Iq)	120 µA	120 µA	120 µA	120 µA	120 µA	120 µA
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

For RoHS3 Compliance Requirements: Select from LP2951ACMMX-3.3/NOPB, LP2951ACMM-3.3/NOPB, LP2951CMM-3.3/NOPB, or LP2951CMMX-3.3/NOPB. All four parts are ROHS3 Compliant and maintain active product status with Texas Instruments. The original LP2951ACMMX-3.3 is RoHS non-compliant and obsolete.

For Packaging Format Selection:

Tape & Reel (TR): LP2951ACMMX-3.3/NOPB or LP2951CMM-3.3/NOPB
Cut Tape (CT) & Digi-Reel®: LP2951ACMM-3.3/NOPB or LP2951CMMX-3.3/NOPB

For Alternative Manufacturer Option: LP2951ACDM-3.3RG from onsemi provides an active, ROHS3 Compliant alternative. This part differs in that the output type is fixed (not adjustable) and voltage dropout is 0.45V @ 100mA (improved performance vs. 0.6V). The onsemi part is supplied in 8-MSOP package format. This option is suitable when manufacturer diversification is required or when the fixed 3.3V output meets application requirements.

For Continued Production: All Texas Instruments parametric equivalents (LP2951ACMMX-3.3/NOPB, LP2951ACMM-3.3/NOPB, LP2951CMM-3.3/NOPB, LP2951CMMX-3.3/NOPB) are recommended as direct replacements due to active status, identical electrical specifications, and RoHS3 compliance. Selection among these four depends solely on packaging and supply chain requirements.

Frequently Asked Questions (FAQ)

Q: Can LP2951ACMMX-3.3/NOPB directly replace the obsolete LP2951ACMMX-3.3?

A: Yes. LP2951ACMMX-3.3/NOPB is a direct equivalent with identical electrical specifications, package dimensions, and pin configuration. The primary differences are active product status and ROHS3 compliance. Packaging format differs (Tape & Reel vs. bulk).

Q: What is the difference between the Texas Instruments parametric equivalents?

A: LP2951ACMMX-3.3/NOPB, LP2951ACMM-3.3/NOPB, LP2951CMM-3.3/NOPB, and LP2951CMMX-3.3/NOPB share identical electrical specifications and package dimensions. Differences are limited to packaging format (Tape & Reel or Cut Tape & Digi-Reel®) and inventory availability. All are ROHS3 Compliant and active.

Q: Can the onsemi LP2951ACDM-3.3RG replace the Texas Instruments part?

A: LP2951ACDM-3.3RG is functionally compatible for applications requiring a fixed 3.3V output. Key differences include: output type (fixed vs. adjustable), voltage dropout (0.45V vs. 0.6V @ 100mA), and manufacturer (onsemi vs. Texas Instruments). The onsemi part is suitable when fixed output voltage meets application requirements and manufacturer diversification is acceptable.

Q: Are all substitute parts in the same package?

A: All parts use 8-TSSOP or 8-MSOP packages with 0.118" width and 3.00mm dimensions. Pin configuration and footprint are compatible across all listed substitutes. Packaging format (Tape & Reel, Cut Tape, or bulk) differs but does not affect PCB assembly compatibility.

Q: What compliance certifications apply to these parts?

A: All active substitute parts (Texas Instruments and onsemi) are ROHS3 Compliant, REACH Unaffected, and classified under ECCN EAR99. Moisture Sensitivity Level is 1 (Unlimited) for all parts. The original LP2951ACMMX-3.3 is RoHS non-compliant.

Q: Which part should be selected for new designs?

A: For new designs, select from the active Texas Instruments parametric equivalents (LP2951ACMMX-3.3/NOPB, LP2951ACMM-3.3/NOPB, LP2951CMM-3.3/NOPB, LP2951CMMX-3.3/NOPB) based on packaging and supply availability. All provide identical electrical performance and RoHS3 compliance. The onsemi LP2951ACDM-3.3RG is an alternative when fixed 3.3V output is acceptable and manufacturer diversification is required.

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