LP2951-03BM Equivalent & Substitute Parts

Part Overview

The LP2951-03BM is a linear voltage regulator IC from Microchip Technology designed for positive adjustable (fixed) output applications. This 8-SOIC surface mount device delivers 100mA output current with input voltage range up to 30V and adjustable output from 1.24V to 29V. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications. Alternatives are available from both Microchip Technology and Texas Instruments with identical or superior electrical characteristics and active product status.

Substiute Parts

LP2951-03BM

Microchip TechnologyIn Stock: 4839LP2951-03BM Datasheet

Current PartRFQ

LP2951-03YM

Microchip TechnologyIn Stock: 15490LP2951-03YM Datasheet

DirectRFQ

LP2951-02YM

Microchip TechnologyIn Stock: 36465LP2951-02YM Datasheet

Parametric EquivalentRFQ

LP2951ACM/NOPB

Texas InstrumentsIn Stock: 2633LP2951ACM/NOPB Datasheet

MFR RecommendedRFQ

LP2951ACMX/NOPB

Texas InstrumentsIn Stock: 27464LP2951ACMX/NOPB Datasheet

MFR RecommendedRFQ

LP2951CM/NOPB

Texas InstrumentsIn Stock: 3298LP2951CM/NOPB Datasheet

MFR RecommendedRFQ

LP2951CMX/NOPB

Texas InstrumentsIn Stock: 57705LP2951CMX/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LP2951-03BM is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Output configuration: Positive
• Output type: Adjustable (Fixed)
• Voltage - Input (Max): 30V
• Voltage - Output range: 1.24V to 29V minimum
• Current - Output: 100mA
• Voltage Dropout (Max): 0.6V @ 100mA
• Operating Temperature: -40°C ~ 125°C

Mechanical Equivalence Criteria:

• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount

Compliance Criteria:

• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• REACH Status: REACH Unaffected

Substitute parts are grouped into three categories: direct manufacturer equivalents from Microchip Technology (LP2951-03YM, LP2951-02YM) and manufacturer-recommended alternatives from Texas Instruments (LP2951ACM/NOPB, LP2951ACMX/NOPB, LP2951CM/NOPB, LP2951CMX/NOPB). All substitutes maintain identical mechanical compatibility and core electrical specifications. Differences in quiescent current (Iq) and control features are noted but do not prevent functional substitution within the specified parameter envelope.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Microchip Technology): LP2951-03YM and LP2951-02YM are direct Microchip equivalents with identical electrical specifications to the LP2951-03BM. Both are active products with ROHS3 compliance. LP2951-02YM offers the highest inventory availability (36,400 units) among Microchip options. These parts maintain the original 150 µA quiescent current specification and are recommended for designs requiring strict parameter matching with the discontinued part.

Alternative Substitutes (Texas Instruments): LP2951ACM/NOPB, LP2951ACMX/NOPB, LP2951CM/NOPB, and LP2951CMX/NOPB are manufacturer-recommended alternatives from Texas Instruments. All four maintain identical voltage, current, and thermal specifications. The Texas Instruments variants feature lower quiescent current (120 µA versus 150 µA) and enhanced protection features (Over Current, Over Temperature, Short Circuit). All are ROHS3 compliant and active products. LP2951CMX/NOPB provides the highest inventory availability (57,671 units) among all substitutes.

Packaging Considerations: Microchip parts (LP2951-03YM, LP2951-02YM) are supplied in Tube packaging. Texas Instruments parts are available in two packaging formats: Tube (LP2951ACM/NOPB, LP2951CM/NOPB) and Cut Tape (CT) & Digi-Reel® (LP2951ACMX/NOPB, LP2951CMX/NOPB). Select packaging based on assembly process requirements and order quantities.

Frequently Asked Questions (FAQ)

Q: Can LP2951-03YM directly replace LP2951-03BM in existing designs? A: Yes. LP2951-03YM is a direct equivalent with identical electrical and mechanical specifications. The primary difference is product status (active versus discontinued) and RoHS compliance (ROHS3 versus non-compliant). No design changes are required.

Q: What is the difference between Microchip and Texas Instruments LP2951 variants? A: Both manufacturers produce functionally equivalent parts within the specified parameter envelope. Texas Instruments variants feature lower quiescent current (120 µA) and additional protection features. Microchip variants maintain the original 150 µA quiescent current. Both are mechanically and electrically compatible in 8-SOIC packages.

Q: Are the Texas Instruments parts (LP2951ACM/NOPB, LP2951CM/NOPB) suitable for high-volume production? A: Yes. Texas Instruments parts are active products with robust inventory levels. LP2951CMX/NOPB offers the highest availability (57,671 units) and is available in Cut Tape & Digi-Reel® packaging suitable for automated assembly.

Q: What is the difference between tube and cut tape packaging? A: Tube packaging is suitable for manual assembly and smaller quantities. Cut Tape (CT) & Digi-Reel® packaging is optimized for automated pick-and-place assembly and high-volume production. Both contain identical components; packaging selection depends on assembly process requirements.

Q: Does the lower quiescent current in Texas Instruments parts affect circuit performance? A: No. The 30 µA reduction in quiescent current (120 µA versus 150 µA) is within normal manufacturing variation and does not affect regulator performance. This difference may provide marginal power consumption benefits in battery-powered applications.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All active substitute parts (LP2951-03YM, LP2951-02YM, and all Texas Instruments variants) are ROHS3 compliant. The original LP2951-03BM is RoHS non-compliant due to its discontinued status.

Q: Can I mix manufacturers in the same production run? A: Yes. All substitute parts maintain identical 8-SOIC package dimensions and electrical specifications. Mixing Microchip and Texas Instruments parts in the same assembly is mechanically and electrically compatible.