LP2951CM Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The LP2951CM is a linear voltage regulator IC from Texas Instruments designed for positive adjustable (fixed) output applications with 100mA current capability in an 8-SOIC package. This device is classified as Last Time Buy, indicating discontinued production. Finding equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for new production runs or design revisions.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LP2951CM
Category	Power Management (PMIC)
Package Type	8-SOIC (0.154", 3.90mm Width)
Output Configuration	Positive
Output Type	Adjustable (Fixed)
Output Current	100mA
Input Voltage (Max)	30V
Output Voltage Range	1.235V to 29V
Dropout Voltage (Max)	0.6V @ 100mA
Quiescent Current	120 µA
Operating Temperature	-40°C to 125°C (TJ)
Protection Features	Over Current, Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LP2951CM are classified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Output configuration (Positive)
Output type (Adjustable/Fixed)
Number of regulators (1)
Output current rating (100mA)
Input voltage maximum (30V)
Output voltage range (1.235V to 29V minimum, 29V maximum)
Dropout voltage (0.6V @ 100mA)
Operating temperature range (-40°C to 125°C)
Package type (8-SOIC or equivalent surface mount)
RoHS3 compliance

Substitution Categories:

Direct Manufacturer Equivalents (Texas Instruments): Parts with identical electrical specifications and 8-SOIC packaging, differing only in packaging format or lead finish.

Parametric Equivalents (Texas Instruments): Parts meeting all critical electrical parameters with identical package specifications.

Manufacturer Recommended Alternatives (Microchip Technology): Parts with equivalent electrical performance, featuring additional control features (Error Flag) and slightly different quiescent current specifications (150 µA vs. 120 µA), available in both tube and tape/reel packaging formats.

Alternative Package Equivalents (onsemi): Parts meeting core electrical specifications in 8-MSOP package format with improved dropout voltage performance (0.45V vs. 0.6V).

Parameter Comparison

Part Number	Manufacturer	Package	Output Current	Input Voltage (Max)	Output Voltage Range	Dropout Voltage @ 100mA	Quiescent Current	Operating Temp	Product Status
LP2951CM	Texas Instruments	8-SOIC	100mA	30V	1.235V - 29V	0.6V	120 µA	-40°C to 125°C	Last Time Buy
LP2951CM/NOPB	Texas Instruments	8-SOIC	100mA	30V	1.235V - 29V	0.6V	120 µA	-40°C to 125°C	Active
LP2951ACM/NOPB	Texas Instruments	8-SOIC	100mA	30V	1.235V - 29V	0.6V	120 µA	-40°C to 125°C	Active
LP2951-02YM	Microchip Technology	8-SOIC	100mA	30V	1.24V - 29V	0.6V	150 µA	-40°C to 125°C	Active
LP2951-02YM-TR	Microchip Technology	8-SOIC	100mA	30V	1.24V - 29V	0.6V	150 µA	-40°C to 125°C	Active
LP2951-03YM	Microchip Technology	8-SOIC	100mA	30V	1.24V - 29V	0.6V	150 µA	-40°C to 125°C	Active
LP2951-03YM-TR	Microchip Technology	8-SOIC	100mA	30V	1.24V - 29V	0.6V	150 µA	-40°C to 125°C	Active
LP2951ACDMR2G	onsemi	8-MSOP	100mA	30V	1.235V - 30V	0.45V	120 µA	-40°C to 125°C	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications and Package): Select LP2951CM/NOPB or LP2951ACM/NOPB from Texas Instruments. Both parts maintain Active product status with full compliance certifications (ROHS3, REACH Unaffected). These are the preferred choices for designs requiring no layout modifications.

For Active Supply with Standard 8-SOIC Package: Microchip Technology LP2951-02YM, LP2951-02YM-TR, LP2951-03YM, or LP2951-03YM-TR are suitable alternatives. These parts are in Active status with higher inventory availability. The quiescent current specification is 150 µA compared to 120 µA in the original part. The -02YM and -03YM variants differ in internal configuration but maintain identical electrical performance for standard applications. Tape/reel packaging (-TR suffix) is available for automated assembly processes.

For Improved Dropout Voltage Performance: The onsemi LP2951ACDMR2G offers superior dropout voltage performance (0.45V vs. 0.6V @ 100mA) in an 8-MSOP package. This part is suitable for applications requiring lower input-to-output voltage differential. PCB layout modifications are required due to package change from 8-SOIC to 8-MSOP.

Compliance and Certification: All substitute parts maintain ROHS3 compliance and REACH Unaffected status, meeting regulatory requirements for new designs. Moisture Sensitivity Level 1 (Unlimited) is consistent across all alternatives.

Frequently Asked Questions (FAQ)

Q: Can I use LP2951-02YM or LP2951-03YM as direct replacements for LP2951CM?

A: Yes, these Microchip Technology parts are functionally equivalent for standard applications. The primary difference is quiescent current (150 µA vs. 120 µA). Both maintain the same output current (100mA), voltage ranges, dropout voltage, and operating temperature specifications. The 8-SOIC package is identical, requiring no PCB layout changes.

Q: What is the difference between LP2951-02YM and LP2951-03YM?

A: Both parts are parametrically equivalent with identical electrical specifications. The suffix designates internal configuration variants. Selection between these parts depends on application-specific requirements not detailed in the electrical parameters provided.

Q: Why does the onsemi LP2951ACDMR2G have different package specifications?

A: The LP2951ACDMR2G uses an 8-MSOP package instead of 8-SOIC. While both are 8-pin surface mount packages, the MSOP has a smaller footprint (0.118" vs. 0.154" width). This package change requires PCB layout modifications but offers improved dropout voltage performance (0.45V vs. 0.6V).

Q: Are tape/reel packaged parts (-TR suffix) electrically identical to tube packaged parts?

A: Yes. The -TR suffix indicates Cut Tape and Digi-Reel packaging format for automated assembly processes. Electrical specifications and performance are identical to tube packaged equivalents. Selection depends on manufacturing process requirements.

Q: Can I mix different manufacturers in my design?

A: All substitute parts listed maintain identical or superior electrical specifications and package compatibility (with noted exceptions for MSOP package). Texas Instruments, Microchip Technology, and onsemi parts are all qualified alternatives. Verify with your design validation process before production implementation.

Q: What is the significance of the /NOPB suffix on Texas Instruments parts?

A: The /NOPB designation indicates "No Plumbum" (lead-free) packaging, confirming RoHS3 compliance. This is standard for current production parts and does not affect electrical performance.

Q: Is the LP2951CM still available for new designs?

A: The LP2951CM is classified as Last Time Buy, indicating discontinued production. For new designs, select from Active status alternatives: LP2951CM/NOPB, LP2951ACM/NOPB (Texas Instruments), or Microchip Technology variants (LP2951-02YM, LP2951-03YM series).

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