LP3879MRX-1.0 Equivalent & Substitute Parts

Part Overview

The LP3879MRX-1.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This device delivers 800mA output current with a fixed 1V output and operates across an input voltage range up to 6V. The part is classified as obsolete, which necessitates identification of active equivalent alternatives for new designs and ongoing production requirements. The substitute part maintains identical electrical and mechanical specifications while offering improved product status and compliance certifications.

Substiute Parts

LP3879MRX-1.0

Texas InstrumentsIn Stock: 2934LP3879MRX-1.0 Datasheet

Current PartRFQ

LP3879MRX-1.0/NOPB

Texas InstrumentsIn Stock: 8465LP3879MRX-1.0/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The LP3879MRX-1.0/NOPB qualifies as a direct substitute based on the following critical parameters:

• Identical output voltage specification (1V fixed)
• Matching output current rating (800mA)
• Same input voltage maximum (6V)
• Identical quiescent current (1.4 mA)
• Matching PSRR performance (60dB at 1kHz)
• Identical protection feature set (Over Current, Over Temperature, Short Circuit)
• Same operating temperature range (-40°C ~ 125°C)
• Identical package and pinout (8-PowerSOIC)
• Same base product number (LP3879)

The substitution is valid across all electrical and mechanical parameters. The primary distinction is product status and packaging format.

Parameter Comparison

Engineering Selection Recommendations

The LP3879MRX-1.0/NOPB is the direct active equivalent for the obsolete LP3879MRX-1.0. Selection of the substitute part is based on:

• Active product status ensuring continued availability and manufacturer support
• ROHS3 compliance versus non-compliant status of the original part
• Identical electrical performance across all specified parameters
• Identical mechanical compatibility and pinout
• Tape & Reel packaging suitable for automated assembly processes

For applications currently using the LP3879MRX-1.0, transition to LP3879MRX-1.0/NOPB requires no circuit modifications or design changes. The parts are pin-compatible and functionally equivalent.

Frequently Asked Questions (FAQ)

Q: Can LP3879MRX-1.0/NOPB be used as a direct replacement for LP3879MRX-1.0?

A: Yes. Both parts share identical electrical specifications, output voltage, current ratings, protection features, and package configuration. No circuit redesign is required.

Q: What is the difference between LP3879MRX-1.0 and LP3879MRX-1.0/NOPB?

A: The primary differences are product status (obsolete versus active), RoHS compliance (non-compliant versus ROHS3 compliant), and packaging format (bulk versus Tape & Reel). Electrical and mechanical specifications are identical.

Q: Why is the original LP3879MRX-1.0 marked as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The active equivalent LP3879MRX-1.0/NOPB provides continued access to the same functionality with improved compliance certifications.

Q: Are there any compatibility concerns with the 8-PowerSOIC package?

A: No. Both parts use the identical 8-PowerSOIC (0.154", 3.90mm Width) package with matching pinout and thermal characteristics. PCB layouts and footprints are fully compatible.

Q: Does the Tape & Reel packaging affect electrical performance?

A: No. Packaging format (bulk versus Tape & Reel) is a logistics and assembly consideration only. Electrical performance and specifications remain identical.

Q: What compliance certifications apply to the substitute part?

A: LP3879MRX-1.0/NOPB is ROHS3 compliant and REACH unaffected. The original LP3879MRX-1.0 is RoHS non-compliant.