LP2951ACM-3.0 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2951ACM-3.0 is a linear voltage regulator IC from Texas Instruments designed for positive adjustable (fixed) output applications with 100mA current capability in an 8-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The LP2951 series provides regulated power supply solutions with integrated protection features including over-current, over-temperature, and short-circuit protection.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP2951ACM-3.0
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Output Configuration	Positive
Output Type	Adjustable (Fixed)
Number of Regulators	1
Voltage - Input (Max)	30V
Voltage - Output (Min/Fixed)	1.235V (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
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the LP2951ACM-3.0 is determined by the following critical parameters:

Electrical Compatibility Requirements:

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

Functional Compatibility:

Protection Features: Over Current, Over Temperature, Short Circuit
Current - Quiescent (Iq): 120 µA

Substitute parts are grouped into three categories based on their relationship to the main part:

Direct Manufacturer Substitutes: Parts from Texas Instruments with identical electrical specifications and active product status (LP2951ACM-3.0/NOPB).

Parametric Equivalents: Parts from alternative manufacturers (National Semiconductor) that maintain all critical electrical parameters and package specifications while offering active availability.

Manufacturer Recommended Alternatives: Parts from onsemi with fixed 3V output configuration that maintain core electrical parameters, current ratings, and package specifications. These parts feature slightly improved dropout voltage performance (0.45V vs 0.6V @ 100mA) and reduced supply current (12 mA vs 14 mA).

Parameter Comparison

Parameter	LP2951ACM-3.0	LP2951ACM-3.0/NOPB	LP2951CM-3.0/NOPB	LP2951ACD-3.0R2G	LP2951CD-3.0G	LP2951CD-3.0R2G
Manufacturer	Texas Instruments	Texas Instruments	National Semiconductor	onsemi	onsemi	onsemi
Output Configuration	Positive	Positive	Positive	Positive	Positive	Positive
Output Type	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)	Fixed	Fixed	Fixed
Number of Regulators	1	1	1	1	1	1
Voltage - Input (Max)	30V	30V	30V	30V	30V	30V
Voltage - Output (Min/Fixed)	1.235V (3V)	1.235V (3V)	1.235V (3V)	3V	3V	3V
Voltage Dropout (Max)	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.45V @ 100mA	0.45V @ 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
Current - Supply (Max)	14 mA	14 mA	14 mA	12 mA	12 mA	12 mA
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: LP2951ACM-3.0/NOPB

This Texas Instruments part is the direct substitute for the obsolete LP2951ACM-3.0. It maintains identical electrical specifications, output type (adjustable/fixed), and protection features. The part is currently active in production status and is ROHS3 compliant, addressing regulatory requirements that the original part does not meet. Inventory availability is substantial at 8,825 pieces.

Secondary Recommendation: LP2951CD-3.0R2G

This onsemi part is suitable for applications where fixed 3V output is acceptable. It is active in production status and ROHS3 compliant. The part offers improved electrical performance with lower dropout voltage (0.45V vs 0.6V @ 100mA) and reduced supply current (12 mA vs 14 mA). Inventory availability is high at 8,530 pieces. This option is appropriate when the adjustable output feature of the original part is not required.

Tertiary Recommendation: LP2951CM-3.0/NOPB

This National Semiconductor part maintains all critical electrical parameters and adjustable output capability. It is active in production status. Inventory availability is 1,900 pieces. This option provides parametric equivalence from an alternative manufacturer.

Avoid: LP2951CD-3.0G

This onsemi part is classified as obsolete and should not be selected for new designs or ongoing production despite ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can I use LP2951CD-3.0R2G as a direct replacement for LP2951ACM-3.0?

A: LP2951CD-3.0R2G is electrically compatible for applications requiring fixed 3V output. The main difference is that the original part supports adjustable output configuration while this substitute is fixed at 3V. If your circuit requires adjustable output capability, use LP2951ACM-3.0/NOPB instead. Both parts share identical package specifications, current ratings, and operating temperature range.

Q: What is the difference between adjustable and fixed output types in the LP2951 series?

A: Adjustable output parts (LP2951ACM-3.0, LP2951ACM-3.0/NOPB, LP2951CM-3.0/NOPB) allow output voltage configuration between 1.235V and 29V through external resistor networks. Fixed output parts (LP2951ACD-3.0R2G, LP2951CD-3.0G, LP2951CD-3.0R2G) are preset to 3V output. Select based on your circuit's voltage requirements.

Q: Why is the original LP2951ACM-3.0 marked as obsolete?

A: The part is no longer in active production. LP2951ACM-3.0/NOPB is the active production equivalent that maintains identical specifications while meeting current RoHS3 compliance requirements.

Q: Are all substitute parts available in the same packaging?

A: All listed substitute parts use the 8-SOIC (0.154", 3.90mm Width) surface mount package. However, packaging format (tube, bulk, cut tape) varies by part number. Verify packaging requirements with your procurement process.

Q: What is the significance of the "/NOPB" suffix?

A: The "/NOPB" suffix indicates "No Plumbum" (lead-free) packaging, which is part of RoHS3 compliance. Parts with this suffix meet lead-free soldering requirements.

Q: Can I substitute LP2951ACD-3.0R2G for applications requiring adjustable output?

A: No. LP2951ACD-3.0R2G is a fixed 3V output part and cannot provide adjustable output functionality. Use LP2951ACM-3.0/NOPB or LP2951CM-3.0/NOPB for adjustable output requirements.

Q: What are the key electrical differences between the onsemi fixed output parts and the original adjustable part?

A: The onsemi fixed output parts (LP2951ACD-3.0R2G, LP2951CD-3.0R2G) feature improved dropout voltage performance (0.45V vs 0.6V @ 100mA) and lower supply current (12 mA vs 14 mA). All other electrical parameters including quiescent current, output current, and operating temperature range remain identical.

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