LP2951ACD-3.0G Equivalent & Substitute Parts

Part Overview

The LP2951ACD-3.0G 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, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The LP2951 series provides positive fixed output regulation with integrated over-current and over-temperature protection, suitable for low-power applications requiring stable 3V rails.

Substiute Parts

LP2951ACD-3.0G

onsemiIn Stock: 4237LP2951ACD-3.0G Datasheet

Current PartRFQ

LP2951CD-3.0G

onsemiIn Stock: 975LP2951CD-3.0G Datasheet

Parametric EquivalentRFQ

LP2951ACM-3.0/NOPB

Texas InstrumentsIn Stock: 8896LP2951ACM-3.0/NOPB Datasheet

SimilarRFQ

LP2951ACMX-3.0/NOPB

Texas InstrumentsIn Stock: 2638LP2951ACMX-3.0/NOPB Datasheet

SimilarRFQ

LP2951CM-3.0/NOPB

National SemiconductorIn Stock: 1981LP2951CM-3.0/NOPB Datasheet

SimilarRFQ

LP2951CMX-3.0/NOPB

Texas InstrumentsIn Stock: 4209LP2951CMX-3.0/NOPB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LP2951ACD-3.0G is determined by the following critical parameters:

• Fixed 3V output voltage
• 100mA output current capability
• 30V maximum input voltage rating
• 8-SOIC package footprint compatibility
• Surface mount technology
• Operating temperature range -40°C to 125°C
• Over-current and over-temperature protection

Substitute parts are grouped into two categories:

Parametric Equivalent (Direct Replacement): LP2951CD-3.0G maintains identical electrical specifications and fixed output configuration, differing only in packaging format (Tube vs. standard).

Similar Parts (Functional Alternatives): LP2951ACM-3.0/NOPB, LP2951ACMX-3.0/NOPB, LP2951CM-3.0/NOPB, and LP2951CMX-3.0/NOPB share the same 8-SOIC package, output current rating, and input voltage maximum. These parts feature adjustable output capability (with fixed 3V configuration option) and enhanced protection features including short-circuit protection. All maintain the 100mA output current and 120 µA quiescent current specifications.

Parameter Comparison

Engineering Selection Recommendations

LP2951CD-3.0G is the direct parametric equivalent from onsemi. This part maintains identical electrical performance and fixed output configuration. Selection is appropriate when onsemi sourcing is preferred and packaging format (Tube) is acceptable for procurement workflows.

LP2951ACM-3.0/NOPB, LP2951ACMX-3.0/NOPB, LP2951CMX-3.0/NOPB are active product alternatives from Texas Instruments and National Semiconductor. These parts provide enhanced functionality through adjustable output capability while maintaining fixed 3V operation through external resistor configuration. All three are ROHS3 compliant and feature additional short-circuit protection. These options are preferred for new designs requiring long-term availability and active manufacturer support.

LP2951CM-3.0/NOPB from National Semiconductor offers similar electrical characteristics and adjustable output capability. RoHS compliance status is not specified for this variant.

Dropout voltage increases from 0.45V to 0.6V in the alternative parts, which may impact designs with marginal input voltage headroom. Maximum supply current increases from 12mA to 14mA. These differences are within typical design tolerances for 3V regulator applications but should be evaluated against specific circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can LP2951CD-3.0G directly replace LP2951ACD-3.0G?

A: Yes. LP2951CD-3.0G is a parametric equivalent with identical electrical specifications, output voltage, current rating, and package footprint. The difference is packaging format (Tube vs. standard). No circuit modifications are required.

Q: What is the difference between fixed and adjustable output types in the LP2951 series?

A: The LP2951ACD-3.0G has a fixed 3V output determined by internal circuitry. The adjustable variants (LP2951ACM-3.0/NOPB, LP2951ACMX-3.0/NOPB, LP2951CM-3.0/NOPB, LP2951CMX-3.0/NOPB) allow output voltage configuration through external resistor networks. When configured for 3V output, they provide equivalent functionality to the fixed version.

Q: Are the Texas Instruments and National Semiconductor alternatives pin-compatible?

A: Yes. All substitute parts use the 8-SOIC package with identical pinout and footprint dimensions (0.154", 3.90mm Width). Direct PCB substitution is possible without layout modifications.

Q: What is the impact of increased dropout voltage in alternative parts?

A: The main part specifies 0.45V dropout at 100mA, while alternatives specify 0.6V. This 0.15V difference means the input voltage must be at least 0.15V higher to maintain 3V output at full load. For applications with input voltages above 3.6V, this difference is negligible. Designs operating near minimum input voltage should evaluate this parameter against circuit requirements.

Q: Why are some alternatives marked as Active while the main part is Obsolete?

A: The LP2951ACD-3.0G is obsolete, meaning onsemi has discontinued production and support. Active alternatives from Texas Instruments and National Semiconductor ensure long-term availability, ongoing manufacturer support, and compliance with current industry standards. New designs should prioritize active parts.

Q: What packaging options are available for substitutes?

A: LP2951CD-3.0G is supplied in Tube format. Texas Instruments variants offer Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® options. National Semiconductor LP2951CM-3.0/NOPB is supplied in Bulk. Selection depends on procurement volume and assembly process requirements.

Q: Are all substitute parts ROHS3 compliant?

A: LP2951ACD-3.0G, LP2951CD-3.0G, LP2951ACM-3.0/NOPB, LP2951ACMX-3.0/NOPB, and LP2951CMX-3.0/NOPB are confirmed ROHS3 compliant. LP2951CM-3.0/NOPB RoHS status is not specified in available documentation.