LP3879SD-1.0 Equivalent & Substitute Parts

Part Overview

The LP3879SD-1.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1V output at 800mA in an 8-WSON (4x4) surface mount package. This device is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. The part integrates micropower operation with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for applications requiring low-noise regulated power delivery in compact form factors.

Substiute Parts

LP3879SD-1.0

Texas InstrumentsIn Stock: 809LP3879SD-1.0 Datasheet

Current PartRFQ

LP3879SD-1.0/NOPB

National SemiconductorIn Stock: 2688LP3879SD-1.0/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LP3879SD-1.0 is determined by strict parametric equivalence across the following critical dimensions:

Electrical Parameters (Must Match):

• Output voltage: 1V fixed
• Maximum output current: 800mA
• Input voltage range: Maximum 6V
• Quiescent current: 1.4 mA
• PSRR specification: 60dB at 1kHz
• Protection features: Over-current, over-temperature, short-circuit protection
• Operating temperature range: -40°C to 125°C
• Control features: Enable function

Mechanical Parameters (Must Match):

• Package type: 8-WSON (4x4)
• Mounting type: Surface mount
• Package case: 8-WDFN Exposed Pad

Compliance Parameters:

• ECCN classification: EAR99
• HTSUS code: 8542.39.0001

Parts meeting all these criteria are classified as parametric equivalents and direct substitutes.

Parameter Comparison

Engineering Selection Recommendations

The LP3879SD-1.0/NOPB from National Semiconductor is a direct parametric equivalent to the obsolete LP3879SD-1.0. Both parts share identical electrical specifications, package geometry, and compliance classifications. The primary distinction is product status: the substitute part is currently active in production, whereas the main part is obsolete.

Selection between these parts should be based on availability and supply chain requirements. The LP3879SD-1.0/NOPB is the recommended choice for new designs and ongoing production due to its active status and documented availability. Both parts are RoHS non-compliant and REACH unaffected, with matching ECCN and HTSUS classifications suitable for export compliance purposes.

Frequently Asked Questions (FAQ)

Q: Can LP3879SD-1.0/NOPB be used as a direct replacement for LP3879SD-1.0?

A: Yes. Both parts are parametrically identical across all electrical and mechanical specifications. The LP3879SD-1.0/NOPB is the active production equivalent and is suitable for direct substitution in applications currently using the obsolete LP3879SD-1.0.

Q: What is the difference between the two part numbers?

A: The primary difference is manufacturer designation and product status. LP3879SD-1.0 is obsolete from Texas Instruments, while LP3879SD-1.0/NOPB is an active part from National Semiconductor. The "/NOPB" suffix indicates lead-free plating. Both parts meet identical electrical and package specifications.

Q: Are there any package compatibility concerns?

A: No. Both parts use the 8-WSON (4x4) package with 8-WDFN exposed pad configuration. PCB footprints, solder reflow profiles, and assembly processes are identical.

Q: What compliance certifications apply to both parts?

A: Both parts share ECCN classification EAR99 and HTSUS code 8542.39.0001. Both are RoHS non-compliant and REACH unaffected. Compliance status is identical between the two parts.

Q: Is the quiescent current specification the same?

A: Yes. Both parts specify 1.4 mA quiescent current and 2.2 mA maximum supply current, ensuring equivalent power consumption characteristics in standby and active modes.

Q: Can these parts be used interchangeably in production?

A: Yes. Electrical performance, thermal characteristics, and protection features are identical. No design modifications or re-qualification are required when transitioning from LP3879SD-1.0 to LP3879SD-1.0/NOPB.