LP2951CD-3.0R2 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2951CD-3.0R2 is a linear voltage regulator IC from onsemi designed for positive fixed 3V output applications with 100mA current capacity in an 8-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The device provides over-current and over-temperature protection suitable for low-power regulation applications across industrial and commercial temperature ranges.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Part Number	LP2951CD-3.0R2
Product Status	Obsolete
Output Voltage (Fixed)	3V
Output Current	100mA
Input Voltage (Max)	30V
Dropout Voltage (Max)	0.45V @ 100mA
Quiescent Current	120 µA
Package	8-SOIC (0.154", 3.90mm Width)
Operating Temperature	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the LP2951CD-3.0R2 is determined by the following critical parameters:

Primary Substitution Criteria:

Output voltage: 3V fixed
Output current capacity: 100mA minimum
Input voltage rating: 30V maximum
Package type: 8-SOIC surface mount
Dropout voltage: 0.45V or lower @ 100mA
Operating temperature range: -40°C to 125°C
Protection features: Over-current and over-temperature protection

Substitution Categories:

Direct Equivalent (Pin-Compatible, Identical Electrical Performance): LP2951CD-3.0R2G from onsemi provides identical electrical specifications with improved product status (Active) and RoHS3 compliance. This part maintains the same fixed 3V output, 100mA capacity, and 8-SOIC package footprint.

Parametric Equivalent (Identical Electrical Performance, Same Manufacturer): LP2951ACD-3.0R2G from onsemi offers the same electrical characteristics as the main part with Active product status and RoHS3 compliance. The "A" designation indicates an enhanced temperature or performance grade while maintaining functional equivalence.

Similar Parts (Cross-Manufacturer Alternatives with Minor Specification Differences): LP2951ACM-3.0/NOPB, LP2951ACMX-3.0/NOPB, LP2951CMX-3.0/NOPB, and LP2951CM-3.0/NOPB are adjustable/fixed output variants from Texas Instruments and National Semiconductor. These parts share the same 100mA output current, 30V input rating, 8-SOIC package, and operating temperature range. Key differences include adjustable output type capability (1.235V to 29V range), slightly higher dropout voltage (0.6V @ 100mA), and additional control features (Enable pin) and protection (Short Circuit protection).

Parameter Comparison

Parameter	LP2951CD-3.0R2	LP2951CD-3.0R2G	LP2951ACD-3.0R2G	LP2951ACM-3.0/NOPB	LP2951ACMX-3.0/NOPB	LP2951CMX-3.0/NOPB	LP2951CM-3.0/NOPB
Manufacturer	onsemi	onsemi	onsemi	Texas Instruments	Texas Instruments	Texas Instruments	National Semiconductor
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Output Voltage	3V Fixed	3V Fixed	3V Fixed	1.235V - 29V (3V Fixed)	1.235V - 29V (3V Fixed)	1.235V - 29V (3V Fixed)	1.235V - 29V (3V Fixed)
Output Current	100mA	100mA	100mA	100mA	100mA	100mA	100mA
Input Voltage (Max)	30V	30V	30V	30V	30V	30V	30V
Dropout Voltage (Max)	0.45V @ 100mA	0.45V @ 100mA	0.45V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA
Quiescent Current	120 µA	120 µA	120 µA	120 µA	120 µA	120 µA	120 µA
Supply Current (Max)	12 mA	12 mA	12 mA	14 mA	14 mA	14 mA	14 mA
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature	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	Over Current, Over Temperature, Short Circuit
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified
Packaging Option	Bulk	Cut Tape (CT)	Cut Tape (CT)	Tube	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Bulk

Engineering Selection Recommendations

For Direct Replacement (Recommended Primary Choice): LP2951CD-3.0R2G is the optimal substitute. It provides identical electrical performance to the obsolete LP2951CD-3.0R2 while offering Active product status, ensuring long-term availability and supply chain stability. This part achieves ROHS3 compliance, meeting modern environmental and regulatory requirements. The Cut Tape packaging option supports both prototype and production volume requirements.

For Secondary Equivalent: LP2951ACD-3.0R2G from onsemi maintains the same electrical specifications and package as the main part with Active status and ROHS3 compliance. The enhanced temperature/performance grade designation provides additional design margin.

For Cross-Manufacturer Alternatives: LP2951ACM-3.0/NOPB, LP2951ACMX-3.0/NOPB, LP2951CMX-3.0/NOPB, and LP2951CM-3.0/NOPB from Texas Instruments and National Semiconductor are functionally compatible alternatives. These parts maintain the 100mA output current, 30V input rating, and 8-SOIC package. The adjustable output capability (1.235V to 29V) provides design flexibility beyond the fixed 3V output. Higher dropout voltage (0.6V vs. 0.45V) and additional protection features (Short Circuit) represent minor specification differences. All cross-manufacturer alternatives carry Active product status and ROHS3 compliance. Selection depends on packaging requirements (Tube, Tape & Reel, or Cut Tape) and design flexibility needs.

Frequently Asked Questions (FAQ)

Q: Can LP2951CD-3.0R2G be used as a direct replacement for LP2951CD-3.0R2? A: Yes. LP2951CD-3.0R2G is a direct equivalent with identical electrical specifications, same 8-SOIC package, and pin-compatible design. The primary advantages are Active product status and ROHS3 compliance.

Q: What is the difference between fixed and adjustable output variants? A: The LP2951CD-3.0R2 provides a fixed 3V output. Cross-manufacturer alternatives (LP2951ACM-3.0/NOPB, LP2951ACMX-3.0/NOPB, LP2951CMX-3.0/NOPB, LP2951CM-3.0/NOPB) offer adjustable output capability from 1.235V to 29V, allowing configuration to 3V through external resistor networks. For fixed 3V applications, the onsemi variants (LP2951CD-3.0R2G, LP2951ACD-3.0R2G) are preferred.

Q: Are there packaging differences between substitute parts? A: Yes. LP2951CD-3.0R2G and LP2951ACD-3.0R2G are supplied in Cut Tape (CT). LP2951ACM-3.0/NOPB comes in Tube. LP2951ACMX-3.0/NOPB is supplied in Tape & Reel (TR). LP2951CMX-3.0/NOPB is available in Cut Tape (CT) & Digi-Reel®. LP2951CM-3.0/NOPB is supplied in Bulk. Select based on production volume and assembly requirements.

Q: What is the significance of the dropout voltage difference (0.45V vs. 0.6V)? A: The LP2951CD-3.0R2 and onsemi equivalents specify 0.45V maximum dropout at 100mA. Cross-manufacturer alternatives specify 0.6V. Lower dropout voltage allows operation with lower input voltages for the same output. For applications with tight input voltage margins, the onsemi variants are preferred.

Q: Are all substitute parts RoHS compliant? A: LP2951CD-3.0R2G, LP2951ACD-3.0R2G, LP2951ACM-3.0/NOPB, LP2951ACMX-3.0/NOPB, and LP2951CMX-3.0/NOPB are ROHS3 compliant. LP2951CM-3.0/NOPB RoHS status is not specified. The original LP2951CD-3.0R2 is RoHS non-compliant.

Q: What additional protection features do cross-manufacturer alternatives provide? A: LP2951ACM-3.0/NOPB, LP2951ACMX-3.0/NOPB, LP2951CMX-3.0/NOPB, and LP2951CM-3.0/NOPB include Short Circuit protection in addition to Over-Current and Over-Temperature protection. The onsemi variants provide Over-Current and Over-Temperature protection only.

Q: Can these parts be used interchangeably in existing designs? A: LP2951CD-3.0R2G and LP2951ACD-3.0R2G are pin-compatible direct replacements for LP2951CD-3.0R2. Cross-manufacturer alternatives (LP2951ACM-3.0/NOPB, LP2951ACMX-3.0/NOPB, LP2951CMX-3.0/NOPB, LP2951CM-3.0/NOPB) are pin-compatible but require circuit design review due to adjustable output capability and higher dropout voltage specification.

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