LP3879SDX-1.2 Equivalent & Substitute Parts

Part Overview

The LP3879SDX-1.2 is a linear voltage regulator IC from Texas Instruments, designed for positive fixed 1.2V output applications with 800mA current capacity in an 8-WSON (4x4) surface mount package. This part is classified as obsolete, making identification of active equivalent substitutes essential for ongoing production and design continuity. The LP3879SDX-1.2 provides regulated power management with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for applications requiring stable low-voltage regulation with minimal quiescent current draw.

Substiute Parts

LP3879SDX-1.2

Texas InstrumentsIn Stock: 2500LP3879SDX-1.2 Datasheet

Current PartRFQ

LP3879SD-1.2/NOPB

Texas InstrumentsIn Stock: 1673LP3879SD-1.2/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP3879SDX-1.2 is determined by strict equivalence across the following critical parameters:

• Output voltage specification: 1.2V fixed
• Output current capacity: 800mA minimum
• Input voltage rating: 6V maximum
• Package configuration: 8-WSON (4x4) / 8-WDFN Exposed Pad
• Protection features: Over-current, over-temperature, and short-circuit protection
• Control interface: Enable pin functionality
• Operating temperature range: -40°C to 125°C
• Quiescent current: 1.4 mA
• PSRR performance: 60dB at 1kHz

The LP3879SD-1.2/NOPB qualifies as a parametric equivalent substitute, maintaining identical electrical specifications and package footprint while differing in product status and packaging format (Cut Tape & Digi-Reel versus Tape & Reel).

Parameter Comparison

Engineering Selection Recommendations

The LP3879SD-1.2/NOPB serves as the direct active substitute for the obsolete LP3879SDX-1.2. All electrical parameters, thermal specifications, and package footprints are identical, ensuring drop-in compatibility at the circuit board level.

Key differentiation factors:

• Product Status: LP3879SD-1.2/NOPB is active and currently manufactured, whereas LP3879SDX-1.2 is obsolete with no ongoing production.
• RoHS Compliance: LP3879SD-1.2/NOPB meets ROHS3 compliance standards, while LP3879SDX-1.2 is RoHS non-compliant. This distinction is critical for applications subject to environmental regulations.
• Packaging: LP3879SD-1.2/NOPB is supplied in Cut Tape and Digi-Reel formats, offering flexibility for both manual and automated assembly workflows.

For new designs or production continuation, LP3879SD-1.2/NOPB is the recommended selection based on active product status and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can LP3879SD-1.2/NOPB replace LP3879SDX-1.2 in existing designs?

A: Yes. Both parts share identical electrical specifications, output voltage (1.2V), output current (800mA), input voltage rating (6V), quiescent current (1.4 mA), PSRR (60dB at 1kHz), and package footprint (8-WSON 4x4). PCB layout and schematic connections require no modification.

Q: What is the primary reason to switch from LP3879SDX-1.2 to LP3879SD-1.2/NOPB?

A: The LP3879SDX-1.2 is obsolete with no ongoing manufacturing. LP3879SD-1.2/NOPB is an active product with current availability. Additionally, LP3879SD-1.2/NOPB meets ROHS3 compliance, whereas LP3879SDX-1.2 does not.

Q: Are there any package or pinout differences between these parts?

A: No. Both parts use the 8-WDFN Exposed Pad package with 8-WSON (4x4) configuration. Pinout, thermal characteristics, and mechanical dimensions are identical.

Q: Does the packaging format (Tape & Reel vs. Cut Tape & Digi-Reel) affect electrical performance?

A: No. Packaging format affects only handling, storage, and assembly logistics. Electrical performance and reliability are unaffected by packaging format differences.

Q: What protection features are included in both parts?

A: Both LP3879SDX-1.2 and LP3879SD-1.2/NOPB include over-current protection, over-temperature protection, and short-circuit protection. Enable pin control is available on both variants.

Q: Is thermal management different between these parts?

A: No. Both parts operate across the same temperature range (-40°C to 125°C) and share identical thermal specifications. The exposed pad design in the 8-WDFN package provides equivalent heat dissipation characteristics.