LP2951CD-3.0G Equivalent & Substitute Parts

Part Overview

The LP2951CD-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 device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The LP2951 series provides positive fixed output regulation with integrated over-current and over-temperature protection across the industrial temperature range of -40°C to 125°C.

Substiute Parts

LP2951CD-3.0G

onsemiIn Stock: 975LP2951CD-3.0G Datasheet

Current PartRFQ

LP2951ACD-3.0R2G

onsemiIn Stock: 6361LP2951ACD-3.0R2G Datasheet

DirectRFQ

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

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LP2951CMX-3.0/NOPB

Texas InstrumentsIn Stock: 4209LP2951CMX-3.0/NOPB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

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

• Output voltage specification (3V fixed)
• Output current capability (100mA minimum)
• Maximum input voltage rating (30V)
• Package type (8-SOIC surface mount)
• Operating temperature range (-40°C to 125°C)
• Protection features (over-current and over-temperature)

Substitute parts must maintain identical or superior electrical performance across these parameters. The LP2951 base product number identifies the functional family. Variants within this family differ by output type (fixed vs. adjustable), packaging format (tube, cut tape, tape & reel), and manufacturer source, but maintain core electrical compatibility when output voltage and current specifications align.

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility): LP2951ACD-3.0R2G from onsemi is the primary substitute. This part maintains identical electrical specifications to the main part, including fixed 3V output, 100mA current, and 0.45V dropout voltage. Product status is active with 6255 units in stock, ensuring supply continuity. Packaging differs (cut tape vs. tube), but electrical and thermal performance are equivalent.

Cross-Manufacturer Alternatives (Active Status): LP2951ACM-3.0/NOPB, LP2951ACMX-3.0/NOPB, LP2951CMX-3.0/NOPB from Texas Instruments and LP2951CM-3.0/NOPB from National Semiconductor are functionally compatible. These parts deliver the required 3V fixed output at 100mA with identical operating temperature range and package footprint. All are active products with substantial inventory availability. Dropout voltage is slightly higher (0.6V vs. 0.45V), and supply current is marginally elevated (14mA vs. 12mA), but remain within acceptable design margins for most applications. These parts include additional short-circuit protection and enable control features not present in the main part.

Compliance Considerations: All recommended substitutes maintain ROHS3 compliance and MSL Level 1 (unlimited moisture sensitivity). REACH status is unaffected across all variants. These certifications ensure regulatory compatibility for industrial and commercial applications.

Frequently Asked Questions (FAQ)

Q: Can LP2951ACD-3.0R2G directly replace LP2951CD-3.0G? A: Yes. Both parts deliver identical electrical performance: 3V fixed output, 100mA current, 0.45V dropout voltage, and -40°C to 125°C operating range. The only difference is packaging format (cut tape vs. tube). Electrical and thermal characteristics are equivalent.

Q: What is the difference between fixed and adjustable output variants? A: The main part (LP2951CD-3.0G) provides a fixed 3V output. Adjustable variants (LP2951ACM-3.0/NOPB, LP2951ACMX-3.0/NOPB, LP2951CM-3.0/NOPB, LP2951CMX-3.0/NOPB) can be configured for outputs from 1.235V to 29V through external resistor networks. When configured for 3V output, adjustable variants are electrically compatible with the fixed version.

Q: Why do some substitutes have higher dropout voltage (0.6V vs. 0.45V)? A: Dropout voltage variation reflects different semiconductor process nodes and design generations within the LP2951 family. The 0.15V difference is typically negligible in applications with adequate input voltage margin. Verify input voltage headroom in your specific circuit before selection.

Q: Are packaging format differences (tube, cut tape, tape & reel, bulk) electrically significant? A: No. Packaging format affects only handling, storage, and assembly processes. Electrical performance, thermal characteristics, and reliability are identical across all packaging options for the same part number variant.

Q: Which substitute offers the best supply availability? A: LP2951ACM-3.0/NOPB from Texas Instruments has the highest inventory (8825 units), followed by LP2951CMX-3.0/NOPB (4198 units) and LP2951ACD-3.0R2G (6255 units). All three are active products suitable for immediate procurement.

Q: Do the additional protection features in substitute parts affect compatibility? A: No. Short-circuit protection and enable control features in Texas Instruments and National Semiconductor variants are additive enhancements. If your circuit does not utilize these features, they remain inactive and do not impact electrical compatibility. If your design requires these features, the substitutes provide additional functionality.

Q: Is the LP2951 series suitable for new designs? A: The base product number LP2951 remains active across multiple manufacturers. While the specific main part (LP2951CD-3.0G) is obsolete, active variants within the LP2951 family are suitable for new designs. Verify long-term availability with your supplier for production planning.