LP2951CD-3.3R2 Equivalent & Substitute Parts

Part Overview

The LP2951CD-3.3R2 is a linear voltage regulator IC from onsemi, delivering a fixed 3.3V output at 100mA 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 support. The device provides over-current and over-temperature protection across an operating range of -40°C to 125°C, with a maximum input voltage of 30V and dropout voltage of 0.45V at full load.

Substiute Parts

LP2951CD-3.3R2

onsemiIn Stock: 3200LP2951CD-3.3R2 Datasheet

Current PartRFQ

LP2951CD-3.3R2G

onsemiIn Stock: 20321LP2951CD-3.3R2G Datasheet

DirectRFQ

LP2951ACD-3.3R2G

onsemiIn Stock: 2633LP2951ACD-3.3R2G Datasheet

Parametric EquivalentRFQ

NCV2951ACD3.3R2G

onsemiIn Stock: 2600NCV2951ACD3.3R2G Datasheet

Parametric EquivalentRFQ

LP2951CS-L-3-3/TR

MaxLinear, Inc.In Stock: 7183LP2951CS-L-3-3/TR Datasheet

DirectRFQ

LP2951ACM-3.3/NOPB

Texas InstrumentsIn Stock: 3307LP2951ACM-3.3/NOPB Datasheet

SimilarRFQ

LP2951ACMX-3.3/NOPB

Texas InstrumentsIn Stock: 163442LP2951ACMX-3.3/NOPB Datasheet

SimilarRFQ

LP2951CM-3.3/NOPB

Texas InstrumentsIn Stock: 26178LP2951CM-3.3/NOPB Datasheet

SimilarRFQ

LP2951CMX-3.3/NOPB

Texas InstrumentsIn Stock: 30192LP2951CMX-3.3/NOPB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP2951CD-3.3R2 is determined by the following critical parameters: fixed 3.3V output voltage, 100mA output current capability, 30V maximum input voltage, 8-SOIC package footprint, and surface mount configuration. All substitute parts must maintain these electrical and mechanical specifications to ensure direct compatibility in existing circuit designs.

Substitute parts are grouped into three categories:

Direct Manufacturer Equivalents (onsemi): Parts with identical electrical specifications and the same base product number (LP2951), differing only in packaging format or product status.

Parametric Equivalents (onsemi & Automotive Grade): Parts meeting all electrical requirements with additional certifications such as AEC-Q100 automotive qualification or RoHS3 compliance.

Similar Parts (Texas Instruments & MaxLinear): Parts from alternative manufacturers with equivalent electrical performance and identical package specifications, though some may have adjustable output configurations or slightly different quiescent current ratings.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred): LP2951CD-3.3R2G is the primary substitute, offering identical electrical specifications with active product status and RoHS3 compliance. This part maintains the same dropout voltage and quiescent current as the original, ensuring drop-in compatibility.

For Automotive Applications: NCV2951ACD3.3R2G is qualified to AEC-Q100 automotive standards and maintains all electrical parameters of the original part. This variant is suitable for automotive-grade designs requiring enhanced reliability certifications.

For Alternative Sourcing: LP2951ACD-3.3R2G provides equivalent performance with active status and RoHS3 compliance, offering supply chain flexibility while maintaining electrical compatibility.

For Cross-Manufacturer Substitution: Texas Instruments LP2951ACM-3.3/NOPB, LP2951ACMX-3.3/NOPB, LP2951CM-3.3/NOPB, and LP2951CMX-3.3/NOPB are functionally equivalent with identical output voltage and current ratings. These parts feature slightly higher dropout voltage (0.6V vs. 0.45V) and are available in higher inventory quantities. All are RoHS3 compliant and active products.

For MaxLinear Alternative: LP2951CS-L-3-3/TR from MaxLinear provides equivalent electrical performance with RoHS compliance. This part has a higher quiescent current (170 µA vs. 120 µA) and includes an Enable control feature not present in the original design.

Frequently Asked Questions (FAQ)

Q: Can LP2951CD-3.3R2G be used as a direct replacement for LP2951CD-3.3R2?

A: Yes. LP2951CD-3.3R2G is a direct substitute with identical electrical specifications, same 8-SOIC package, and equivalent performance. The primary difference is product status (active vs. obsolete) and RoHS3 compliance.

Q: What is the difference between onsemi and Texas Instruments LP2951 variants?

A: Both manufacturers produce LP2951-based regulators with the same 3.3V output and 100mA current rating in 8-SOIC packages. Texas Instruments variants have a maximum dropout voltage of 0.6V compared to onsemi's 0.45V. Both are functionally compatible for most applications.

Q: Is NCV2951ACD3.3R2G suitable for non-automotive applications?

A: Yes. NCV2951ACD3.3R2G meets all electrical requirements of the original part and includes automotive-grade certification. It can be used in any application requiring the LP2951CD-3.3R2 specifications.

Q: How does the MaxLinear LP2951CS-L-3-3/TR differ from onsemi variants?

A: The MaxLinear part has identical output voltage and current specifications with the same 8-SOIC package. It features a higher quiescent current (170 µA vs. 120 µA) and includes an Enable control pin for power management flexibility.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts listed are RoHS3 compliant. The original LP2951CD-3.3R2 is marked as RoHS non-compliant due to its obsolete status.

Q: What packaging options are available for LP2951 regulators?

A: Substitute parts are available in multiple packaging formats: Tape & Reel (TR), Cut Tape with Digi-Reel (CT), and Tube. All maintain the same 8-SOIC footprint and surface mount configuration.

Q: Can I use LP2951ACM-3.3/NOPB if my design requires the lowest quiescent current?

A: LP2951ACM-3.3/NOPB has a quiescent current of 120 µA, matching the original part. However, it has a higher dropout voltage (0.6V vs. 0.45V), which may affect performance in low-input-voltage applications.