LP5951MG-3.0 Equivalent & Substitute Parts

Part Overview

The LP5951MG-3.0 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 3V output at 150mA in a compact SC-70-5 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device provides positive fixed output regulation with integrated enable control and comprehensive protection features including over-current, over-temperature, and short-circuit protection.

Substiute Parts

LP5951MG-3.0

Texas InstrumentsIn Stock: 6258LP5951MG-3.0 Datasheet

Current PartRFQ

LP5951MG-3.0/NOPB

Texas InstrumentsIn Stock: 3449LP5951MG-3.0/NOPB Datasheet

Parametric EquivalentRFQ

LP5951MGX-3.0/NOPB

Texas InstrumentsIn Stock: 1042LP5951MGX-3.0/NOPB Datasheet

Parametric EquivalentRFQ

LD59015C30R

STMicroelectronicsIn Stock: 31225LD59015C30R Datasheet

MFR RecommendedRFQ

MIC5365-3.0YC5-TR

Microchip TechnologyIn Stock: 48396MIC5365-3.0YC5-TR Datasheet

MFR RecommendedRFQ

MIC5366-3.0YC5-TR

Microchip TechnologyIn Stock: 978MIC5366-3.0YC5-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP5951MG-3.0 are qualified based on the following critical parameters:

• Fixed output voltage of 3V
• Output current capability of 150mA
• Maximum input voltage of 5.5V
• Voltage dropout specification of 0.35V or lower at 150mA
• Quiescent current in the range of 39–60 µA
• Operating temperature range of -40°C to 125°C
• Surface mount packaging compatible with SC-70-5 footprint (5-TSSOP, SOT-353)
• Enable control feature
• Over-current and over-temperature protection

Substitutes are grouped into two categories: parametric equivalents (identical electrical specifications) and manufacturer-recommended alternatives (functionally equivalent with minor specification variations).

Parameter Comparison

Engineering Selection Recommendations

Parametric Equivalents (Identical Electrical Performance):

LP5951MG-3.0/NOPB and LP5951MGX-3.0/NOPB are direct parametric equivalents to the obsolete LP5951MG-3.0. Both are active products from Texas Instruments with identical electrical specifications and SC-70-5 packaging. The primary difference is packaging format: LP5951MG-3.0/NOPB is supplied in Tape & Reel, while LP5951MGX-3.0/NOPB is also Tape & Reel. Both achieve ROHS3 compliance, addressing regulatory requirements of the obsolete original part.

Manufacturer-Recommended Alternatives:

LD59015C30R (STMicroelectronics) provides superior voltage dropout performance at 0.21V compared to 0.35V, reducing power dissipation in current-limited applications. The package is SOT-323-5, which shares the same 5-pin footprint as SC-70-5 but with different pin spacing. This part omits short-circuit protection compared to the original.

MIC5365-3.0YC5-TR and MIC5366-3.0YC5-TR (Microchip Technology) offer improved quiescent current at 39 µA versus 55 µA, and superior PSRR performance at 80dB–65dB. Both maintain SC-70-5 packaging and ROHS3 compliance. MIC5365 and MIC5366 are functionally equivalent with identical electrical specifications; selection depends on availability and supply chain requirements.

Compliance Consideration:

All substitute parts achieve ROHS3 compliance, making them suitable for applications requiring regulatory adherence. The original LP5951MG-3.0 is RoHS non-compliant; substitution addresses this requirement.

Frequently Asked Questions (FAQ)

Q: Can LP5951MG-3.0/NOPB directly replace the obsolete LP5951MG-3.0?

A: Yes. LP5951MG-3.0/NOPB is a parametric equivalent with identical electrical specifications, output voltage, current rating, and SC-70-5 packaging. The only difference is product status (active vs. obsolete) and RoHS compliance. No circuit modifications are required.

Q: What is the difference between LP5951MG-3.0/NOPB and LP5951MGX-3.0/NOPB?

A: Both are parametric equivalents from Texas Instruments with identical electrical performance and SC-70-5 packaging. The difference lies in manufacturing process or internal design revision (indicated by the "X" suffix). Both are active products suitable for new designs.

Q: Can I use LD59015C30R as a direct replacement?

A: LD59015C30R is functionally equivalent but requires PCB layout verification. The package is SOT-323-5 instead of SC-70-5; while both are 5-pin surface mount packages, pin spacing differs. Verify footprint compatibility before substitution. LD59015C30R offers lower dropout voltage (0.21V vs. 0.35V) but lacks short-circuit protection.

Q: What are the advantages of MIC5365-3.0YC5-TR over the original LP5951MG-3.0?

A: MIC5365-3.0YC5-TR maintains identical output voltage and current specifications with SC-70-5 packaging. Advantages include lower quiescent current (39 µA vs. 55 µA), superior PSRR performance (80dB–65dB vs. 60dB–50dB), and ROHS3 compliance. These improvements reduce power consumption and improve noise rejection in sensitive applications.

Q: Are MIC5365-3.0YC5-TR and MIC5366-3.0YC5-TR interchangeable?

A: Yes. Both Microchip parts are functionally equivalent with identical electrical specifications, output voltage, current rating, and SC-70-5 packaging. Selection is based on availability and supply chain logistics.

Q: Do all substitute parts support the Enable control feature?

A: Yes. All listed substitutes include Enable control functionality, maintaining circuit compatibility with designs utilizing this feature.

Q: What protection features are present in each substitute?

A: LP5951MG-3.0/NOPB and LP5951MGX-3.0/NOPB include over-current, over-temperature, and short-circuit protection. LD59015C30R, MIC5365-3.0YC5-TR, and MIC5366-3.0YC5-TR include over-current and over-temperature protection. Short-circuit protection is absent in the Microchip and STMicroelectronics alternatives.

Q: Are all substitutes RoHS compliant?

A: Yes. All active substitute parts achieve ROHS3 compliance. The original LP5951MG-3.0 is RoHS non-compliant; substitution addresses regulatory requirements for new production.