LP3963ESX-5.0 Equivalent & Substitute Parts

Part Overview

The LP3963ESX-5.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 5V output at 3A in a TO-263 (DDPAK-5) surface mount package. This part is currently obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The regulator includes integrated protection features for over-current, over-temperature, and short-circuit conditions, with an enable control feature for power management applications.

Substiute Parts

LP3963ESX-5.0

Texas InstrumentsIn Stock: 4764LP3963ESX-5.0 Datasheet

Current PartRFQ

LP3853ESX-5.0/NOPB

Texas InstrumentsIn Stock: 2012LP3853ESX-5.0/NOPB Datasheet

Parametric EquivalentRFQ

LP3856ESX-5.0/NOPB

Texas InstrumentsIn Stock: 810LP3856ESX-5.0/NOPB Datasheet

Parametric EquivalentRFQ

LP3873ESX-5.0/NOPB

Texas InstrumentsIn Stock: 1953LP3873ESX-5.0/NOPB Datasheet

Parametric EquivalentRFQ

MIC29301-5.0WU

Microchip TechnologyIn Stock: 12495MIC29301-5.0WU Datasheet

MFR RecommendedRFQ

SPX29301T5-L-5-0/TR

MaxLinear, Inc.In Stock: 2223SPX29301T5-L-5-0/TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LP3963ESX-5.0 is determined by the following critical parameters: fixed 5V output voltage, 3A output current capability, TO-263 package compatibility, -40°C to 125°C operating temperature range, and integrated protection features (over-current, over-temperature, short-circuit). All substitute parts must maintain these core electrical and mechanical specifications to ensure direct functional replacement without circuit redesign.

The substitute parts are grouped into two categories:

Texas Instruments Active Alternatives (LP3853ESX-5.0/NOPB, LP3856ESX-5.0/NOPB, LP3873ESX-5.0/NOPB): These parts share identical output specifications and package type. LP3853ESX-5.0/NOPB and LP3856ESX-5.0/NOPB offer improved performance with lower dropout voltage (0.6V vs 1.2V) and reduced quiescent current (4 mA vs 9 mA). LP3873ESX-5.0/NOPB maintains the same electrical characteristics as the original part while offering active product status.

Cross-Manufacturer Alternatives (MIC29301-5.0WU, SPX29301T5-L-5-0/TR): These parts from Microchip Technology and MaxLinear, Inc. provide equivalent 5V/3A output in the same TO-263 package with active product status. Both support the required operating temperature range and protection features, though with different maximum input voltage ratings and dropout specifications.

Parameter Comparison

Engineering Selection Recommendations

For direct replacement of the obsolete LP3963ESX-5.0, the Texas Instruments LP3873ESX-5.0/NOPB is the primary recommendation. It maintains identical electrical characteristics (1.2V dropout, 9 mA quiescent current) while offering active product status and ROHS3 compliance, ensuring long-term availability and supply chain continuity.

For applications where improved efficiency is beneficial, LP3853ESX-5.0/NOPB and LP3856ESX-5.0/NOPB provide superior performance with 50% lower dropout voltage (0.6V) and reduced quiescent current (4 mA), resulting in lower power dissipation. Both parts maintain ROHS3 compliance and active status.

Cross-manufacturer alternatives MIC29301-5.0WU and SPX29301T5-L-5-0/TR are suitable when supply constraints exist for Texas Instruments parts. MIC29301-5.0WU supports higher input voltage (26V maximum) and offers ROHS3 compliance. SPX29301T5-L-5-0/TR accommodates input voltages up to 16V with RoHS compliance. Both maintain the required 5V/3A output and TO-263 package compatibility.

All substitute parts are ROHS3 or RoHS compliant and operate across the full -40°C to 125°C temperature range, meeting regulatory and environmental requirements for industrial and commercial applications.

Frequently Asked Questions (FAQ)

Q: Can LP3873ESX-5.0/NOPB directly replace LP3963ESX-5.0 without circuit modifications?

A: Yes. LP3873ESX-5.0/NOPB is a direct replacement. Both parts share identical output voltage (5V), output current (3A), dropout voltage (1.2V @ 3A), quiescent current (9 mA), operating temperature range (-40°C to 125°C), and TO-263 package configuration. No circuit redesign is required.

Q: What is the advantage of using LP3853ESX-5.0/NOPB or LP3856ESX-5.0/NOPB over LP3873ESX-5.0/NOPB?

A: LP3853ESX-5.0/NOPB and LP3856ESX-5.0/NOPB offer improved efficiency characteristics with 50% lower dropout voltage (0.6V vs 1.2V @ 3A) and reduced quiescent current (4 mA vs 9 mA). These improvements reduce power dissipation and heat generation, beneficial for battery-powered or thermally constrained applications. Both maintain full compatibility with the original package and output specifications.

Q: Are cross-manufacturer parts (MIC29301-5.0WU, SPX29301T5-L-5-0/TR) suitable for all applications?

A: Cross-manufacturer parts are suitable when they meet the specific input voltage requirements of your application. MIC29301-5.0WU supports input voltages up to 26V, while SPX29301T5-L-5-0/TR supports up to 16V. If your circuit operates within 7V maximum input (matching the original LP3963ESX-5.0), all substitute parts are functionally compatible. Verify input voltage specifications for your specific design.

Q: What packaging options are available for these substitute parts?

A: All substitute parts are available in TO-263 (DDPAK-5) surface mount package, matching the original LP3963ESX-5.0. LP3853ESX-5.0/NOPB, LP3856ESX-5.0/NOPB, and LP3873ESX-5.0/NOPB are supplied in Tape & Reel (TR) packaging. MIC29301-5.0WU is available in Tube packaging. SPX29301T5-L-5-0/TR is supplied in Tape & Reel format. Package type does not affect electrical performance or PCB compatibility.

Q: Are all substitute parts compliant with current environmental regulations?

A: Yes. LP3853ESX-5.0/NOPB, LP3856ESX-5.0/NOPB, LP3873ESX-5.0/NOPB, and MIC29301-5.0WU are ROHS3 compliant. SPX29301T5-L-5-0/TR is RoHS compliant. All parts are REACH unaffected or REACH compliant, meeting current environmental and regulatory requirements for industrial and commercial applications.