LP2951ACMMX Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2951ACMMX is a linear voltage regulator IC from Texas Instruments designed for positive adjustable (fixed) output applications. This surface-mount device delivers 100mA output current in an 8-VSSOP package and is classified as obsolete. Due to its obsolete status, identifying parametrically equivalent substitute parts is essential for design continuity and procurement flexibility. The substitute parts listed maintain identical electrical specifications and package compatibility while offering improved availability and compliance status.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Adjustable (Fixed)
Number of Regulators	1
Voltage - Input (Max)	30V
Voltage - Output (Min/Fixed)	1.235V (5V)
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 are determined by strict parametric equivalence across all electrical and mechanical specifications. The following criteria define valid substitution:

Critical Substitution Parameters:

Output Configuration: Positive
Output Type: Adjustable (Fixed)
Number of Regulators: 1
Voltage - Input (Max): 30V
Voltage - Output (Min/Fixed): 1.235V (5V)
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

All substitute parts listed maintain 100% compliance with these parameters. Variations in packaging format (Cut Tape, Digi-Reel, Tape & Reel) and RoHS compliance status do not affect electrical or mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	RoHS Status	Packaging	Voltage Input (Max)	Current Output	Dropout Voltage	Operating Temp	Package Type
LP2951ACMMX	Texas Instruments	Obsolete	RoHS non-compliant	-	30V	100mA	0.6V @ 100mA	-40°C ~ 125°C	8-VSSOP
LP2951ACMM	Texas Instruments	Last Time Buy	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®	30V	100mA	0.6V @ 100mA	-40°C ~ 125°C	8-VSSOP
LP2951ACMM/NOPB	Texas Instruments	Active	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®	30V	100mA	0.6V @ 100mA	-40°C ~ 125°C	8-VSSOP
LP2951ACMMX/NOPB	Texas Instruments	Active	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®	30V	100mA	0.6V @ 100mA	-40°C ~ 125°C	8-VSSOP
LP2951CMM/NOPB	Texas Instruments	Active	ROHS3 Compliant	Tape & Reel (TR)	30V	100mA	0.6V @ 100mA	-40°C ~ 125°C	8-VSSOP
LP2951CMMX/NOPB	Texas Instruments	Active	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®	30V	100mA	0.6V @ 100mA	-40°C ~ 125°C	8-VSSOP

Engineering Selection Recommendations

Primary Recommendation: LP2951ACMM/NOPB

This part is the preferred substitute for the obsolete LP2951ACMMX. It maintains active product status with ROHS3 compliance and is available in Cut Tape and Digi-Reel packaging formats. The /NOPB designation indicates lead-free processing, meeting modern environmental and regulatory requirements.

Secondary Recommendations:

LP2951ACMMX/NOPB offers identical electrical specifications and active status. Selection between LP2951ACMM/NOPB and LP2951ACMMX/NOPB depends on packaging quantity requirements and procurement lead times.

LP2951CMM/NOPB and LP2951CMMX/NOPB are functionally equivalent alternatives available in Tape & Reel and Cut Tape formats respectively. These parts support high-volume production environments.

Compliance Considerations:

All recommended substitutes are ROHS3 compliant, addressing regulatory requirements for new designs. The original LP2951ACMMX is RoHS non-compliant and should be replaced in new designs or redesigns.

All parts maintain REACH Unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can LP2951ACMM/NOPB directly replace LP2951ACMMX in existing designs?

A: Yes. All electrical parameters, output specifications, protection features, and package dimensions are identical. The /NOPB designation indicates lead-free processing, which is compatible with standard reflow soldering processes.

Q: What is the difference between LP2951ACMM and LP2951CMM variants?

A: Both variants are parametrically equivalent. The difference lies in product status and packaging format. LP2951ACMM is Last Time Buy status, while LP2951CMM is Active. Packaging options vary between Cut Tape/Digi-Reel and Tape & Reel formats.

Q: Does the /NOPB suffix affect electrical performance?

A: No. The /NOPB designation indicates lead-free (no lead/no plumbum) processing and does not alter electrical specifications, output characteristics, or thermal performance.

Q: Are all substitute parts available in the same 8-VSSOP package?

A: Yes. All substitute parts use the 8-VSSOP package (8-TSSOP, 8-MSOP with 0.118" width, 3.00mm). PCB layout and component placement remain unchanged.

Q: Which substitute part should be selected for high-volume production?

A: LP2951CMM/NOPB in Tape & Reel format is optimized for high-volume manufacturing. LP2951CMMX/NOPB in Cut Tape/Digi-Reel format supports medium-volume requirements.

Q: Are there any temperature or environmental performance differences between substitutes?

A: No. All substitute parts operate across the identical temperature range of -40°C to 125°C (junction temperature) with identical quiescent current, dropout voltage, and protection features.

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