LP3876ESX-2.5 Equivalent & Substitute Parts

Part Overview

The LP3876ESX-2.5 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 2.5V output at 3A in a TO-263 (DDPAK-5) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device provides positive fixed output configuration with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for applications requiring stable low-voltage power delivery with moderate current capacity.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	3A
Input Voltage (Max)	7V
Voltage Dropout (Max)	1.2V @ 3A
Quiescent Current (Iq)	5 mA
Supply Current (Max)	15 mA
Operating Temperature Range	-40°C ~ 125°C
Package Type	TO-263 (DDPAK-5)
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution eligibility for the LP3876ESX-2.5 is determined by strict parameter matching across the following critical specifications:

Core Electrical Parameters (Must Match):

Output voltage: 2.5V fixed
Output current capability: 3A
Input voltage maximum: 7V
Package type: TO-263 (DDPAK-5)
Mounting type: Surface Mount
Operating temperature range: -40°C ~ 125°C
Protection features: Over Current, Over Temperature, Short Circuit
Control features: Enable function

Allowable Variations:

Voltage dropout: May be lower than 1.2V @ 3A (improved performance)
Quiescent current: May be lower than 5 mA (improved efficiency)
Supply current: May be lower than 15 mA (improved efficiency)
PSRR: May be specified or unspecified
Product status: Active parts preferred over obsolete
RoHS compliance: ROHS3 compliant preferred
Packaging format: Tape & Reel or Bulk acceptable

All identified substitutes meet these criteria and are electrically and mechanically compatible with the LP3876ESX-2.5.

Parameter Comparison

Part Number	Manufacturer	Status	Output Voltage	Output Current	Dropout @ 3A	Iq (mA)	Supply Current (Max)	PSRR	RoHS	Inventory
LP3876ESX-2.5	Texas Instruments	Obsolete	2.5V	3A	1.2V	5 mA	15 mA	—	Non-compliant	5946 Pcs
LP3876ESX-2.5/NOPB	Texas Instruments	Active	2.5V	3A	1.2V	5 mA	15 mA	—	ROHS3 Compliant	858 Pcs
LP3853ESX-2.5/NOPB	National Semiconductor	Active	2.5V	3A	0.6V	4 mA	10 mA	73dB ~ 57dB (120Hz)	—	1622 Pcs
LP3856ESX-2.5/NOPB	Texas Instruments	Active	2.5V	3A	0.6V	4 mA	10 mA	73dB ~ 57dB (120Hz)	ROHS3 Compliant	1784 Pcs
LP3963ESX-2.5/NOPB	Texas Instruments	Active	2.5V	3A	1.2V	9 mA	15 mA	—	ROHS3 Compliant	1418 Pcs
LP3966ESX-2.5/NOPB	Texas Instruments	Active	2.5V	3A	1.2V	9 mA	15 mA	—	ROHS3 Compliant	1762 Pcs

Engineering Selection Recommendations

Direct Replacement (Identical Electrical Performance): LP3876ESX-2.5/NOPB is the direct equivalent with identical electrical specifications. This part is active and ROHS3 compliant, making it the primary choice for obsolete part replacement. Packaging is Tape & Reel format suitable for production environments.

Enhanced Performance Alternatives: LP3853ESX-2.5/NOPB and LP3856ESX-2.5/NOPB offer improved performance characteristics with lower voltage dropout (0.6V vs 1.2V), reduced quiescent current (4 mA vs 5 mA), and lower supply current (10 mA vs 15 mA). LP3856ESX-2.5/NOPB is from Texas Instruments with ROHS3 compliance. These parts are suitable when thermal efficiency or lower power consumption is beneficial.

Compatible Alternatives with Higher Quiescent Current: LP3963ESX-2.5/NOPB and LP3966ESX-2.5/NOPB maintain identical dropout voltage and supply current specifications but have elevated quiescent current (9 mA vs 5 mA). Both are active, ROHS3 compliant Texas Instruments products. These are suitable for applications where the increased quiescent current does not impact system performance.

All substitute parts share identical package type (TO-263 DDPAK-5), mounting type (Surface Mount), operating temperature range (-40°C ~ 125°C), and protection features (Over Current, Over Temperature, Short Circuit).

Frequently Asked Questions (FAQ)

Q: Can LP3876ESX-2.5/NOPB directly replace the obsolete LP3876ESX-2.5? A: Yes. LP3876ESX-2.5/NOPB is the direct equivalent with identical electrical specifications. The primary difference is product status (Active vs Obsolete) and RoHS compliance (ROHS3 Compliant). No design changes are required.

Q: What is the difference between LP3856ESX-2.5/NOPB and LP3876ESX-2.5? A: LP3856ESX-2.5/NOPB offers improved performance with lower voltage dropout (0.6V vs 1.2V @ 3A), lower quiescent current (4 mA vs 5 mA), and lower supply current (10 mA vs 15 mA). Both maintain 2.5V output at 3A in identical TO-263 packaging. LP3856 is suitable when thermal efficiency is a design priority.

Q: Are all substitute parts in the same package? A: Yes. All substitute parts use TO-263 (DDPAK-5) surface mount packaging with identical pinout and mechanical dimensions. No PCB layout changes are necessary.

Q: What is the significance of PSRR specification in LP3853ESX-2.5/NOPB and LP3856ESX-2.5/NOPB? A: PSRR (Power Supply Rejection Ratio) of 73dB ~ 57dB (120Hz) indicates superior noise rejection compared to parts without specified PSRR. This is beneficial in applications requiring low-noise power delivery but does not affect basic substitution compatibility.

Q: Can I use LP3963ESX-2.5/NOPB or LP3966ESX-2.5/NOPB as direct replacements? A: Yes, both are electrically compatible. However, they have higher quiescent current (9 mA vs 5 mA). In applications where standby power consumption is critical, this difference may be significant. Verify system power budget before selection.

Q: What packaging formats are available for these substitutes? A: LP3876ESX-2.5/NOPB, LP3856ESX-2.5/NOPB, LP3963ESX-2.5/NOPB, and LP3966ESX-2.5/NOPB are supplied in Tape & Reel format. LP3853ESX-2.5/NOPB is available in Bulk format. Select based on production volume and handling requirements.

Q: Are all substitute parts RoHS compliant? A: LP3876ESX-2.5/NOPB, LP3856ESX-2.5/NOPB, LP3963ESX-2.5/NOPB, and LP3966ESX-2.5/NOPB are ROHS3 compliant. LP3853ESX-2.5/NOPB RoHS status is not specified in available data. Verify compliance requirements for your application before selection.

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