LP2951ACN Equivalent & Substitute Parts

Part Overview

The LP2951ACN is a linear voltage regulator IC from onsemi designed for positive adjustable (fixed) output applications with 100mA current capability in an 8-DIP through-hole package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing production, maintenance, and design updates. The LP2951ACN provides regulated output from 1.235V to 30V with integrated over-current and over-temperature protection, suitable for applications requiring low-dropout regulation in legacy systems.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP2951ACN
Manufacturer	onsemi
Category	Power Management (PMIC)
Description	IC REG LIN POS ADJ 100MA 8DIP
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
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)	30V
Voltage Dropout (Max)	0.45V @ 100mA
Current - Output	100mA
Current - Quiescent (Iq)	120 µA
Current - Supply (Max)	12 mA
Protection Features	Over Current, Over Temperature
Operating Temperature	-40°C ~ 125°C
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

The LP2951ACN is a linear voltage regulator with specific electrical and mechanical characteristics. Substitute parts must satisfy the following criteria based on provided parameters:

Primary Substitution Criteria:

Positive output configuration
Adjustable or fixed output voltage capability
Single regulator output
Input voltage range supporting up to 30V
Output current capability of 100mA or greater
Through-hole or compatible package form factor
Operating temperature range of -40°C to 125°C or broader

Identified Substitute Parts:

The provided substitute list includes LM2901M and LM2901M/NOPB. However, these parts are classified as comparators (General Purpose, 4-element) rather than linear voltage regulators. These devices do not meet the primary functional requirement of the LP2951ACN as a voltage regulator and therefore cannot serve as direct functional equivalents based on the provided specifications.

Parameter Comparison

Parameter	LP2951ACN	LM2901M	LM2901M/NOPB
Manufacturer	onsemi	onsemi	Texas Instruments
Category	Power Management (PMIC)	Linear (Comparator)	Linear (Comparator)
Device Type	Voltage Regulator	Comparator	Comparator
Package / Case	8-DIP (0.300", 7.62mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)
Mounting Type	Through Hole	Surface Mount	Surface Mount
Voltage - Supply Range	2V ~ 30V (Input Max)	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V
Operating Temperature	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Product Status	Obsolete	Obsolete	Active
RoHS Status	RoHS non-compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

Based on the provided specifications, the LM2901M and LM2901M/NOPB are not suitable direct substitutes for the LP2951ACN. The LP2951ACN functions as a linear voltage regulator with dedicated output regulation, while the LM2901M variants are general-purpose comparators with fundamentally different circuit topologies and applications.

For applications requiring LP2951ACN replacement:

If a direct voltage regulator substitute is required, alternative linear regulator ICs from the same manufacturer or compatible sources should be evaluated based on matching the following parameters: positive output configuration, 100mA output current capability, adjustable or fixed output voltage range (1.235V to 30V), maximum input voltage of 30V, and through-hole package compatibility.

Compliance Considerations:

The LP2951ACN is RoHS non-compliant and obsolete. If regulatory compliance is required for new designs, the LM2901M/NOPB from Texas Instruments carries ROHS3 compliance and active product status, though it does not serve as a functional equivalent. New designs should specify a modern linear regulator IC that meets both functional requirements and current compliance standards.

Frequently Asked Questions (FAQ)

Q: Can LM2901M or LM2901M/NOPB directly replace the LP2951ACN?

A: No. The LM2901M and LM2901M/NOPB are comparator ICs, not voltage regulators. They perform signal comparison functions and cannot provide the regulated DC output voltage required by applications designed for the LP2951ACN.

Q: What is the functional difference between the LP2951ACN and the listed substitutes?

A: The LP2951ACN is a linear voltage regulator that maintains a stable output voltage across varying input voltages and load conditions. The LM2901M variants are comparators that compare two input signals and produce a digital output. These are distinct device classes with different circuit architectures and applications.

Q: Are there package compatibility considerations?

A: Yes. The LP2951ACN uses an 8-DIP through-hole package, while the LM2901M variants use 14-SOIC surface-mount packages. These packages are not mechanically or electrically interchangeable without redesign of the PCB layout and assembly process.

Q: What should be done if the LP2951ACN is no longer available?

A: Identify a modern linear voltage regulator IC that matches the required electrical specifications: positive output, 100mA capability, adjustable or fixed output voltage range, and appropriate input voltage rating. Verify package compatibility with existing PCB designs or plan for layout modifications if surface-mount alternatives are selected.

Q: Does the operating temperature range affect substitution?

A: Yes. The LP2951ACN operates from -40°C to 125°C, while the LM2901M variants operate from -40°C to 85°C. Applications requiring the full -40°C to 125°C range cannot use the LM2901M variants as substitutes.

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