LP5951MG-2.8 Equivalent & Substitute Parts

Part Overview

The LP5951MG-2.8 is a linear voltage regulator IC from Texas Instruments, delivering a fixed positive output of 2.8V at 150mA in a 5-TSSOP (SC-70-5) 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 integrated protection features including over-current, over-temperature, and short-circuit protection, with an enable control feature for power management applications.

Substiute Parts

LP5951MG-2.8

Texas InstrumentsIn Stock: 5218LP5951MG-2.8 Datasheet

Current PartRFQ

LP5951MG-2.8/NOPB

Texas InstrumentsIn Stock: 1870LP5951MG-2.8/NOPB Datasheet

Parametric EquivalentRFQ

LP5951MGX-2.8/NOPB

Texas InstrumentsIn Stock: 1238LP5951MGX-2.8/NOPB Datasheet

Parametric EquivalentRFQ

MIC5365-2.8YC5-TR

Microchip TechnologyIn Stock: 4080MIC5365-2.8YC5-TR Datasheet

MFR RecommendedRFQ

MIC5366-2.8YC5-TR

Microchip TechnologyIn Stock: 14289MIC5366-2.8YC5-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LP5951MG-2.8 is determined by the following critical parameters: fixed output voltage of 2.8V, output current capability of 150mA, maximum input voltage of 5.5V, package configuration (5-TSSOP/SC-70-5), and operating temperature range of -40°C to 125°C. All substitute parts listed maintain these core electrical and mechanical specifications, ensuring functional compatibility in existing circuit designs.

The substitute parts are grouped into two categories:

Texas Instruments Direct Equivalents: LP5951MG-2.8/NOPB and LP5951MGX-2.8/NOPB maintain identical electrical specifications and differ only in packaging format (Tape & Reel versus Cut Tape & Digi-Reel).

Microchip Technology Alternatives: MIC5365-2.8YC5-TR and MIC5366-2.8YC5-TR provide parametric equivalence with improved performance characteristics in quiescent current and PSRR, while maintaining all critical electrical and mechanical parameters.

Parameter Comparison

Engineering Selection Recommendations

For new designs and production transitions from the obsolete LP5951MG-2.8, the following selection criteria apply:

Texas Instruments LP5951MG-2.8/NOPB or LP5951MGX-2.8/NOPB are recommended as direct replacements when maintaining the original design is required. Both parts are active products with ROHS3 compliance and identical electrical performance to the original part. Selection between these two variants depends on packaging requirements: LP5951MG-2.8/NOPB is supplied in Tape & Reel format, while LP5951MGX-2.8/NOPB is available in Cut Tape & Digi-Reel format.

Microchip Technology MIC5365-2.8YC5-TR or MIC5366-2.8YC5-TR provide parametric equivalence with performance improvements in quiescent current (39 µA versus 55 µA) and PSRR (80dB ~ 65dB versus 60dB ~ 50dB). Both are active products with ROHS3 compliance. These alternatives are suitable for applications where lower power consumption or improved noise rejection is beneficial. MIC5366-2.8YC5-TR offers higher inventory availability (14,231 units) compared to MIC5365-2.8YC5-TR (4,050 units).

All substitute parts maintain identical package configuration, output voltage, output current, input voltage rating, and operating temperature range, ensuring direct functional compatibility in circuit applications.

Frequently Asked Questions (FAQ)

Q: Can LP5951MG-2.8/NOPB be used as a direct replacement for LP5951MG-2.8?

A: Yes. Both parts deliver identical electrical specifications: 2.8V fixed output, 150mA output current, 0.35V maximum dropout voltage, and -40°C to 125°C operating range. The primary difference is packaging format and product status. LP5951MG-2.8/NOPB is an active product with ROHS3 compliance, making it the recommended direct replacement for obsolete LP5951MG-2.8.

Q: What are the differences between LP5951MGX-2.8/NOPB and LP5951MG-2.8/NOPB?

A: Both parts are electrically identical with matching output voltage, current, dropout voltage, and quiescent current specifications. The difference is packaging format: LP5951MG-2.8/NOPB is supplied in Tape & Reel (TR) format, while LP5951MGX-2.8/NOPB is available in Cut Tape (CT) & Digi-Reel format. Selection depends on your procurement and assembly requirements.

Q: Can Microchip MIC5365-2.8YC5-TR or MIC5366-2.8YC5-TR replace the LP5951MG-2.8?

A: Yes. Both Microchip parts maintain the critical electrical specifications: 2.8V output voltage, 150mA output current, 5.5V maximum input voltage, and 5-TSSOP package configuration. They offer improved performance with lower quiescent current (39 µA versus 55 µA) and higher PSRR (80dB ~ 65dB versus 60dB ~ 50dB). Dropout voltage is also lower at 0.31V versus 0.35V.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use the 5-TSSOP (SC-70-5, SOT-353) surface mount package, ensuring mechanical and electrical compatibility with existing PCB layouts and solder reflow processes.

Q: What is the difference between MIC5365-2.8YC5-TR and MIC5366-2.8YC5-TR?

A: Both parts are electrically identical with matching output voltage, current, dropout voltage, quiescent current, and PSRR specifications. The primary difference is inventory availability: MIC5366-2.8YC5-TR has significantly higher stock (14,231 units) compared to MIC5365-2.8YC5-TR (4,050 units). Both are active products with ROHS3 compliance.

Q: Are all substitute parts RoHS compliant?

A: The original LP5951MG-2.8 is RoHS non-compliant. All substitute parts (LP5951MG-2.8/NOPB, LP5951MGX-2.8/NOPB, MIC5365-2.8YC5-TR, and MIC5366-2.8YC5-TR) are ROHS3 compliant, meeting current environmental and regulatory requirements.

Q: What protection features do the substitute parts provide?

A: Texas Instruments LP5951 variants provide over-current, over-temperature, and short-circuit protection. Microchip MIC5365 and MIC5366 variants provide over-current and over-temperature protection. All parts include enable control features for power management applications.