LP3963ESX-2.5 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3963ESX-2.5 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed positive 2.5V output at 3A maximum current in a TO-263 (DDPAK-5) surface mount package. The main part number LP3963ESX-2.5 is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Active alternatives with identical or superior electrical characteristics are available from Texas Instruments and National Semiconductor.

Substiute Parts

LP3963ESX-2.5

Texas InstrumentsIn Stock: 1283LP3963ESX-2.5 Datasheet

Current PartRFQ

LP3963ESX-2.5/NOPB

Texas InstrumentsIn Stock: 1497LP3963ESX-2.5/NOPB Datasheet

DirectRFQ

LP3853ESX-2.5/NOPB

National SemiconductorIn Stock: 1706LP3853ESX-2.5/NOPB Datasheet

Parametric EquivalentRFQ

LP3856ESX-2.5/NOPB

Texas InstrumentsIn Stock: 1855LP3856ESX-2.5/NOPB Datasheet

Parametric EquivalentRFQ

LP3876ESX-2.5/NOPB

Texas InstrumentsIn Stock: 939LP3876ESX-2.5/NOPB Datasheet

Parametric EquivalentRFQ

LP3966ESX-2.5/NOPB

Texas InstrumentsIn Stock: 1816LP3966ESX-2.5/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP3963ESX-2.5 are classified based on electrical parameter compatibility within the allowed specifications for this product category. All substitute candidates maintain the core functional requirements: 2.5V fixed positive output, 3A output current capability, TO-263 package, and identical protection features (over current, over temperature, short circuit).

The substitution logic is based on the following key parameters:

• Output voltage and configuration (2.5V positive fixed)
• Maximum output current (3A)
• Maximum input voltage (7V)
• Package and pinout compatibility (TO-263 DDPAK-5)
• Protection and control features (Enable control, OCP, OTP, SCP)
• Operating temperature range (-40°C to 125°C)

Variations in dropout voltage, quiescent current, and supply current are permitted within the allowed electrical specifications for this regulator category, provided all other parameters remain compatible.

Parameter Comparison

Engineering Selection Recommendations

For designs currently using the obsolete LP3963ESX-2.5, the following selection criteria apply:

Direct Replacement (Identical Electrical Characteristics): LP3963ESX-2.5/NOPB is the active production equivalent with identical electrical specifications. This part is ROHS3 compliant and maintains the same dropout voltage (1.2V @ 3A), quiescent current (9 mA), and supply current (15 mA) as the original. Packaging is Tape & Reel (TR) format.

Enhanced Performance Alternatives: LP3856ESX-2.5/NOPB and LP3853ESX-2.5/NOPB offer improved efficiency characteristics with reduced dropout voltage (0.6V @ 3A) and lower quiescent current (4 mA). These parts are suitable for applications where power dissipation and thermal management are critical design factors. LP3856ESX-2.5/NOPB is from Texas Instruments with ROHS3 compliance; LP3853ESX-2.5/NOPB is from National Semiconductor.

Compatible Alternatives: LP3876ESX-2.5/NOPB and LP3966ESX-2.5/NOPB maintain the original dropout voltage and supply current specifications while offering reduced quiescent current (5 mA and 9 mA respectively). Both are ROHS3 compliant and available in active production status.

All substitute parts share identical package type (TO-263 DDPAK-5), pinout compatibility, protection features, and operating temperature range with the original LP3963ESX-2.5.

Frequently Asked Questions (FAQ)

Q: Can LP3963ESX-2.5/NOPB be used as a direct replacement for LP3963ESX-2.5? A: Yes. LP3963ESX-2.5/NOPB is the active production equivalent with identical electrical specifications. The primary difference is packaging format (Tape & Reel vs. bulk) and RoHS compliance status (ROHS3 Compliant vs. Non-compliant).

Q: What is the difference between LP3856ESX-2.5/NOPB and LP3963ESX-2.5? A: Both deliver 2.5V at 3A in TO-263 packaging. LP3856ESX-2.5/NOPB features lower dropout voltage (0.6V vs. 1.2V @ 3A) and reduced quiescent current (4 mA vs. 9 mA), resulting in lower power dissipation and improved thermal performance.

Q: Are all substitute parts in the same package? A: Yes. All substitute parts use the TO-263 (DDPAK-5) surface mount package with identical pinout and mechanical dimensions, ensuring direct PCB compatibility.

Q: Which substitute part offers the best efficiency? A: LP3856ESX-2.5/NOPB and LP3853ESX-2.5/NOPB both provide the lowest dropout voltage (0.6V @ 3A) and quiescent current (4 mA), minimizing power loss and heat generation.

Q: Is RoHS compliance required for my application? A: If RoHS3 compliance is mandatory, select from LP3963ESX-2.5/NOPB, LP3856ESX-2.5/NOPB, LP3876ESX-2.5/NOPB, or LP3966ESX-2.5/NOPB. The original LP3963ESX-2.5 is RoHS non-compliant; LP3853ESX-2.5/NOPB RoHS status is not specified.

Q: Can I use these parts interchangeably on the same PCB? A: Yes, provided your circuit design accommodates the electrical parameter variations listed in the Parameter Comparison table. Designs sensitive to dropout voltage or quiescent current should verify compatibility before substitution.

Q: What is the difference between packaging formats (Tape & Reel vs. Bulk)? A: Tape & Reel (TR) packaging is standard for automated assembly lines and high-volume production. Bulk packaging is used for lower-volume applications or manual assembly. Electrical performance is identical; packaging format affects handling and assembly processes only.