LP3879MRX-1.2 Equivalent & Substitute Parts

Part Overview

The LP3879MRX-1.2 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This device delivers 800mA output current at a fixed 1.2V output with integrated protection features including over-current, over-temperature, and short-circuit protection. The part is classified as obsolete, making identification of active equivalent alternatives essential for new designs and ongoing production support. The substitute part LP3879MRX-1.2/NOPB maintains identical electrical and mechanical specifications while offering active product status and improved compliance certifications.

Substiute Parts

LP3879MRX-1.2

Texas InstrumentsIn Stock: 4777LP3879MRX-1.2 Datasheet

Current PartRFQ

LP3879MRX-1.2/NOPB

Texas InstrumentsIn Stock: 1610LP3879MRX-1.2/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP3879MRX-1.2 is determined by strict equivalence across the following critical parameters:

• Output voltage specification: 1.2V fixed output
• Output current capability: 800mA minimum
• Input voltage rating: 6V maximum
• Package form factor: 8-PowerSOIC with identical pin configuration
• Protection feature set: Over-current, over-temperature, and short-circuit protection
• Quiescent current and PSRR characteristics: 1.4mA Iq and 60dB PSRR at 1kHz
• Operating temperature range: -40°C to 125°C

The LP3879MRX-1.2/NOPB satisfies all these criteria as a direct parametric equivalent, differing only in product status classification and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The LP3879MRX-1.2/NOPB is the direct substitute for the obsolete LP3879MRX-1.2. Both parts are manufactured by Texas Instruments and share identical electrical performance and mechanical specifications. The primary distinction is product lifecycle status: the LP3879MRX-1.2/NOPB maintains active production status, ensuring long-term availability and supply chain continuity.

For applications requiring RoHS3 compliance, the LP3879MRX-1.2/NOPB is the appropriate selection. Both parts maintain REACH Unaffected status and EAR99 export classification. The /NOPB suffix indicates lead-free plating, aligning with modern environmental and regulatory standards.

Frequently Asked Questions (FAQ)

Q: Are LP3879MRX-1.2 and LP3879MRX-1.2/NOPB pin-for-pin compatible?

A: Yes. Both parts use the 8-PowerSOIC package with identical pin configuration and electrical function. Direct PCB substitution is supported without layout modifications.

Q: What does the /NOPB suffix indicate?

A: The /NOPB designation specifies lead-free plating on the device leads, indicating compliance with RoHS3 standards. The electrical and functional specifications remain unchanged from the base part number.

Q: Can the LP3879MRX-1.2/NOPB replace the obsolete LP3879MRX-1.2 in existing designs?

A: Yes. The LP3879MRX-1.2/NOPB is a direct parametric equivalent with identical output voltage (1.2V), output current (800mA), input voltage rating (6V maximum), protection features, and operating temperature range. No circuit modifications are required.

Q: What is the difference in RoHS compliance between these parts?

A: The LP3879MRX-1.2 is RoHS non-compliant, while the LP3879MRX-1.2/NOPB is ROHS3 compliant. For new designs or applications subject to RoHS regulations, the /NOPB variant is required.

Q: Are there any differences in thermal or electrical performance?

A: No. Both parts deliver identical quiescent current (1.4mA), supply current (2.2mA maximum), PSRR (60dB at 1kHz), and operating temperature range (-40°C to 125°C). Thermal and electrical performance characteristics are equivalent.

Q: What packaging options are available for the LP3879MRX-1.2/NOPB?

A: The LP3879MRX-1.2/NOPB is supplied in Cut Tape (CT) and Digi-Reel packaging formats. Both maintain the 8-PowerSOIC form factor with 0.154" width (3.90mm).