LP2951CD-3.0 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2951CD-3.0 is a linear voltage regulator IC from onsemi designed for positive fixed 3V output at 100mA in an 8-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The LP2951 series provides regulated power management in compact form factors suitable for embedded systems and low-power applications requiring thermal and overcurrent protection.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP2951CD-3.0
Manufacturer	onsemi
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Input (Max)	30V
Voltage - Output (Min/Fixed)	3V
Voltage Dropout (Max)	0.45V @ 100mA
Current - Output	100mA
Current - Quiescent (Iq)	120 µA
Operating Temperature	-40°C ~ 125°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the LP2951CD-3.0 are grouped based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Output Configuration: Positive
Number of Regulators: 1
Voltage - Input (Max): 30V
Voltage - Output (Min/Fixed): 3V
Current - Output: 100mA
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Operating Temperature Range: -40°C ~ 125°C

Direct Equivalent: LP2951CD-3.0G differs only in packaging format (Tube vs. standard) and RoHS compliance status (ROHS3 Compliant), maintaining identical electrical specifications.

Similar Substitutes: LP2951ACM-3.0/NOPB, LP2951ACMX-3.0/NOPB, and LP2951CMX-3.0/NOPB share the same base product number, package, and core electrical parameters. These parts feature adjustable output type capability with extended voltage output range (1.235V to 29V) and enhanced protection features including short circuit protection. Voltage dropout specification increases to 0.6V @ 100mA, and quiescent current supply increases to 14 mA maximum.

Parameter Comparison

Parameter	LP2951CD-3.0	LP2951CD-3.0G	LP2951ACM-3.0/NOPB	LP2951ACMX-3.0/NOPB	LP2951CMX-3.0/NOPB
Manufacturer	onsemi	onsemi	Texas Instruments	Texas Instruments	Texas Instruments
Output Configuration	Positive	Positive	Positive	Positive	Positive
Output Type	Fixed	Fixed	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)
Number of Regulators	1	1	1	1	1
Voltage - Input (Max)	30V	30V	30V	30V	30V
Voltage - Output (Min/Fixed)	3V	3V	1.235V (3V)	1.235V (3V)	1.235V (3V)
Voltage - Output (Max)	—	—	29V	29V	29V
Voltage Dropout (Max)	0.45V @ 100mA	0.45V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA
Current - Output	100mA	100mA	100mA	100mA	100mA
Current - Quiescent (Iq)	120 µA	120 µA	120 µA	120 µA	120 µA
Current - Supply (Max)	12 mA	12 mA	14 mA	14 mA	14 mA
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
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)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Standard	Tube	Tube	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance): LP2951CD-3.0G is the direct equivalent, maintaining all electrical specifications of the original part. Selection of this substitute is appropriate when RoHS3 compliance and tube packaging are acceptable for the application.

For Active Product Status Requirement: LP2951ACM-3.0/NOPB, LP2951ACMX-3.0/NOPB, and LP2951CMX-3.0/NOPB are active products from Texas Instruments, providing long-term availability and supply chain continuity. These parts are suitable for new designs or production runs requiring active product status and ROHS3 compliance.

Compliance Considerations: All substitute parts listed carry ROHS3 compliance certification, addressing regulatory requirements for new production. The original LP2951CD-3.0 is RoHS non-compliant and should be replaced in applications subject to RoHS directives.

Electrical Trade-offs: Substitutes with adjustable output type (ACM variants) provide enhanced protection features including short circuit protection and support extended output voltage range. These parts exhibit slightly higher voltage dropout (0.6V vs. 0.45V @ 100mA) and maximum supply current (14 mA vs. 12 mA), which must be evaluated against application power budget constraints.

Frequently Asked Questions (FAQ)

Q: Can LP2951CD-3.0G be used as a direct drop-in replacement for LP2951CD-3.0? A: Yes. LP2951CD-3.0G maintains identical electrical specifications including output voltage, current rating, dropout voltage, and operating temperature range. The primary differences are packaging format (Tube) and RoHS3 compliance status. Verify that tube packaging is compatible with your assembly process.

Q: What is the difference between fixed and adjustable output type variants? A: The original LP2951CD-3.0 provides fixed 3V output. Adjustable variants (ACM, ACMX, CMX) support output voltage configuration from 1.235V to 29V through external resistor networks, offering design flexibility. When configured for 3V output, adjustable variants are electrically compatible with the fixed version.

Q: Are there performance differences between onsemi and Texas Instruments versions? A: Both manufacturers' versions share the same base product specifications and package. Texas Instruments variants (ACM-3.0/NOPB, ACMX-3.0/NOPB, CMX-3.0/NOPB) are active products with enhanced protection features (short circuit protection) and ROHS3 compliance. Voltage dropout increases to 0.6V @ 100mA compared to 0.45V for the original part.

Q: What packaging formats are available for these substitutes? A: LP2951CD-3.0G is supplied in Tube format. LP2951ACM-3.0/NOPB is supplied in Tube. LP2951ACMX-3.0/NOPB is supplied in Tape & Reel (TR). LP2951CMX-3.0/NOPB is supplied in Cut Tape (CT) & Digi-Reel®. Select packaging based on assembly volume and handling requirements.

Q: Is RoHS3 compliance mandatory for my application? A: RoHS3 compliance is required for products sold in the European Union and many other regulated markets. If your application is subject to RoHS directives, select from the ROHS3 compliant substitutes listed. The original LP2951CD-3.0 is RoHS non-compliant and unsuitable for regulated markets.

Q: What is the impact of increased voltage dropout in substitute parts? A: Substitute parts exhibit 0.6V dropout at 100mA versus 0.45V for the original. This 0.15V difference affects minimum input voltage requirements and power dissipation. For applications with tight input voltage margins or high ambient temperatures, verify that the increased dropout does not exceed system specifications.

Q: Can I use LP2951CMX-3.0/NOPB from National Semiconductor? A: LP2951CM-3.0/NOPB from National Semiconductor is listed as an available substitute with identical electrical specifications. Verify current availability through your component supplier, as National Semiconductor products may have limited distribution channels.

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