LP2951ACD-3.0R2 Equivalent & Substitute Parts

Part Overview

The LP2951ACD-3.0R2 is a linear voltage regulator IC from onsemi, delivering a fixed 3V output at 100mA in an 8-SOIC surface mount package. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and production continuity. The LP2951 series provides positive fixed output regulation with integrated over-current and over-temperature protection across an operating range of -40°C to 125°C.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	3V
Voltage - Input (Max)	30V
Current - Output	100mA
Voltage Dropout (Max)	0.45V @ 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

Substitute Part Grouping Explanation

Substitution of the LP2951ACD-3.0R2 is determined by the following critical parameters:

Output Voltage: Fixed 3V output is the primary selection criterion
Output Current: 100mA minimum capability required
Package Type: 8-SOIC surface mount form factor
Input Voltage Range: Maximum 30V input tolerance
Dropout Voltage: Performance at specified current levels
Operating Temperature Range: -40°C to 125°C compatibility
Protection Features: Over-current and over-temperature protection

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalents maintain identical electrical specifications and are sourced from the same manufacturer (onsemi) with active product status and improved compliance certifications.

Parametric Equivalents from alternative manufacturers (Texas Instruments, National Semiconductor) provide functionally equivalent performance with the same output voltage, current rating, and package, though with variations in output type configuration (adjustable vs. fixed) and additional control features.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Voltage	Output Current	Dropout Voltage	Package	RoHS Status	Packaging Type
LP2951ACD-3.0R2	onsemi	Obsolete	3V (Fixed)	100mA	0.45V @ 100mA	8-SOIC	Non-compliant	Bulk
LP2951ACD-3.0R2G	onsemi	Active	3V (Fixed)	100mA	0.45V @ 100mA	8-SOIC	ROHS3 Compliant	Cut Tape (CT)
LP2951CD-3.0R2G	onsemi	Active	3V (Fixed)	100mA	0.45V @ 100mA	8-SOIC	ROHS3 Compliant	Cut Tape (CT)
LP2951ACM-3.0/NOPB	Texas Instruments	Active	1.235V - 29V (Adjustable, Fixed at 3V)	100mA	0.6V @ 100mA	8-SOIC	ROHS3 Compliant	Tube
LP2951ACMX-3.0/NOPB	Texas Instruments	Active	1.235V - 29V (Adjustable, Fixed at 3V)	100mA	0.6V @ 100mA	8-SOIC	ROHS3 Compliant	Tape & Reel (TR)
LP2951CM-3.0/NOPB	National Semiconductor	Active	1.235V - 29V (Adjustable, Fixed at 3V)	100mA	0.6V @ 100mA	8-SOIC	Not specified	Bulk
LP2951CMX-3.0/NOPB	Texas Instruments	Active	1.235V - 29V (Adjustable, Fixed at 3V)	100mA	0.6V @ 100mA	8-SOIC	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

Primary Recommendation: LP2951ACD-3.0R2G

This part is the direct successor to the obsolete LP2951ACD-3.0R2. It maintains identical electrical specifications while offering active product status and ROHS3 compliance. The only difference is packaging format (Cut Tape vs. Bulk), which does not affect electrical performance. This is the preferred choice for direct replacement in new production.

Secondary Recommendation: LP2951CD-3.0R2G

This onsemi part provides equivalent electrical performance with active status and ROHS3 compliance. It differs only in the device code designation (CD vs. ACD) and packaging format. Both parts are sourced from the same manufacturer and maintain the same electrical characteristics.

Alternative Recommendation: LP2951CMX-3.0/NOPB

For applications requiring maximum supply chain flexibility, the Texas Instruments LP2951CMX-3.0/NOPB offers active product status and ROHS3 compliance. This part features adjustable output capability (1.235V to 29V) with fixed 3V configuration, providing additional design flexibility. The dropout voltage is slightly higher at 0.6V compared to 0.45V for the onsemi variants. Tape & Reel packaging supports automated assembly processes.

Compliance Consideration:

The original LP2951ACD-3.0R2 is RoHS non-compliant. All recommended substitutes (LP2951ACD-3.0R2G, LP2951CD-3.0R2G, and Texas Instruments variants) are ROHS3 compliant, meeting current regulatory requirements for new designs and production.

Frequently Asked Questions (FAQ)

Q: Can LP2951ACD-3.0R2G be used as a direct replacement for LP2951ACD-3.0R2?

A: Yes. The LP2951ACD-3.0R2G is electrically identical to the obsolete LP2951ACD-3.0R2, with the same output voltage (3V), current rating (100mA), dropout voltage (0.45V @ 100mA), and 8-SOIC package. The primary differences are active product status and ROHS3 compliance. Packaging format differs (Cut Tape vs. Bulk), which does not affect circuit performance.

Q: What is the difference between LP2951ACD-3.0R2G and LP2951CD-3.0R2G?

A: Both parts are onsemi products with identical electrical specifications and active status. The difference lies in the device code designation (ACD vs. CD). Both are suitable replacements for the obsolete LP2951ACD-3.0R2 and are available in Cut Tape packaging with ROHS3 compliance.

Q: Can Texas Instruments LP2951CMX-3.0/NOPB replace the onsemi LP2951ACD-3.0R2?

A: Yes, with design considerations. The Texas Instruments part provides the same 3V fixed output and 100mA current rating in an 8-SOIC package. However, it features adjustable output capability (1.235V to 29V range) and has a slightly higher dropout voltage (0.6V vs. 0.45V @ 100mA). The additional control features (Enable pin) and higher quiescent current (14mA vs. 12mA) should be evaluated for your specific application. This part is ROHS3 compliant and available in Tape & Reel format.

Q: What does "adjustable (fixed)" output type mean?

A: This designation indicates that the regulator IC is internally configured for a fixed 3V output but uses the same die as the adjustable version. The part can deliver the specified 3V output without external configuration components, while maintaining the same package and pin configuration as the adjustable variant.

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

A: Yes. All recommended substitute parts use the 8-SOIC (0.154", 3.90mm Width) surface mount package, ensuring mechanical and electrical compatibility with existing PCB designs. Packaging formats (Bulk, Cut Tape, Tape & Reel) differ for supply chain and assembly purposes but do not affect the component itself.

Q: What is the significance of RoHS compliance for this part?

A: The original LP2951ACD-3.0R2 is RoHS non-compliant. All active substitute parts (LP2951ACD-3.0R2G, LP2951CD-3.0R2G, and Texas Instruments variants) are ROHS3 compliant, meeting current environmental and regulatory standards required for new product designs and manufacturing in most markets.

Q: Which substitute part has the best availability?

A: LP2951CD-3.0R2G shows the highest inventory (8,530 pcs), followed by LP2951ACM-3.0/NOPB (8,825 pcs) and LP2951CMX-3.0/NOPB (4,198 pcs). LP2951ACD-3.0R2G has 6,255 pcs in stock. Availability should be verified with your supplier for current production requirements.

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