LP3879MR-1.0 Equivalent & Substitute Parts

Part Overview

The LP3879MR-1.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1V output applications with 800mA current capacity in an 8-SO PowerPad surface mount package. This device is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. The regulator integrates over-current, over-temperature, and short-circuit protection with an enable control feature, suitable for micropower applications requiring low noise performance.

Substiute Parts

LP3879MR-1.0

Texas InstrumentsIn Stock: 2141LP3879MR-1.0 Datasheet

Current PartRFQ

LP3879MR-1.0/NOPB

National SemiconductorIn Stock: 1439LP3879MR-1.0/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP3879MR-1.0 is determined by strict equivalence across the following critical parameters:

• Output voltage specification: 1V fixed output
• Output current capacity: 800mA minimum
• Input voltage maximum rating: 6V
• Package type: 8-PowerSOIC (0.154", 3.90mm Width)
• Protection features: Over-current, over-temperature, and short-circuit protection
• Control capability: Enable feature
• Quiescent current: 1.4 mA
• PSRR performance: 60dB at 1kHz
• Operating temperature range: -40°C to 125°C

The LP3879MR-1.0/NOPB qualifies as a direct substitute based on identical electrical specifications and package configuration. The primary distinction is product status: the substitute part is active, whereas the original is obsolete.

Parameter Comparison

Engineering Selection Recommendations

The LP3879MR-1.0/NOPB is the appropriate substitute for the obsolete LP3879MR-1.0. Both parts maintain identical electrical performance specifications and physical package dimensions, ensuring direct functional compatibility in existing circuit designs.

The primary advantage of selecting the LP3879MR-1.0/NOPB is its active product status, which ensures ongoing availability and manufacturing support. The original LP3879MR-1.0 is obsolete and subject to supply discontinuation.

Both parts carry identical compliance designations: EAR99 export classification and HTSUS code 8542.39.0001. The original part is RoHS non-compliant; compliance status of the substitute should be verified against current National Semiconductor documentation if RoHS compliance is a design requirement.

Frequently Asked Questions (FAQ)

Q: Can the LP3879MR-1.0/NOPB be used as a direct replacement for the LP3879MR-1.0?

A: Yes. Both parts are electrically and mechanically identical. The LP3879MR-1.0/NOPB is the active production equivalent and is suitable for direct substitution in all applications where the original part was specified.

Q: What does the "/NOPB" suffix indicate?

A: The "/NOPB" suffix denotes "No Plumbum" (lead-free) packaging designation. This is a manufacturing and packaging identifier that does not affect electrical performance or functional compatibility.

Q: Are there any package compatibility concerns?

A: No. Both parts use the identical 8-PowerSOIC (0.154", 3.90mm Width) surface mount package. PCB footprints, solder reflow profiles, and mounting procedures are identical.

Q: What is the significance of the obsolete status?

A: The obsolete status of the LP3879MR-1.0 indicates that Texas Instruments has discontinued manufacturing and support. The LP3879MR-1.0/NOPB, maintained by National Semiconductor as an active part, provides production continuity and supply security for new designs and ongoing production requirements.

Q: Are the protection features identical between both parts?

A: Yes. Both the LP3879MR-1.0 and LP3879MR-1.0/NOPB include identical over-current, over-temperature, and short-circuit protection mechanisms with the same enable control feature.