LP3876ES-2.5 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3876ES-2.5 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device provides a fixed positive output of 2.5V at 3A output current in a TO-263 (DDPAK-5) surface mount package. The main part number is currently listed as Obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design requirements and procurement planning.

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
Output Configuration	Positive Fixed
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature Range	-40°C ~ 125°C
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the LP3876ES-2.5 is determined by strict equivalence across the following critical parameters:

Output voltage: 2.5V fixed
Output current capability: 3A
Input voltage maximum: 7V
Package type: TO-263 (DDPAK-5) surface mount
Output configuration: Positive fixed
Control features: Enable function
Protection features: Over Current, Over Temperature, Short Circuit

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalents: Parts with identical electrical specifications and the same base product lineage from Texas Instruments.

Parametric Equivalents: Parts meeting all critical electrical and mechanical requirements but with variations in secondary parameters such as quiescent current, dropout voltage, or PSRR characteristics. These parts maintain functional compatibility while offering different performance trade-offs.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Dropout (Max)	Iq (mA)	Supply Current (Max)	Product Status	RoHS Status
LP3876ES-2.5	Texas Instruments	2.5V	3A	1.2V @ 3A	5	15 mA	Obsolete	RoHS non-compliant
LP3876ES-2.5/NOPB	Texas Instruments	2.5V	3A	1.2V @ 3A	5	15 mA	Active	ROHS3 Compliant
LP3853ES-2.5/NOPB	Texas Instruments	2.5V	3A	0.6V @ 3A	4	10 mA	Active	ROHS3 Compliant
LP3856ES-2.5/NOPB	National Semiconductor	2.5V	3A	0.6V @ 3A	4	10 mA	Active	Not specified
LP3873ES-2.5/NOPB	National Semiconductor	2.5V	3A	1.2V @ 3A	9	15 mA	Active	Not specified
LP3963ES-2.5/NOPB	Texas Instruments	2.5V	3A	1.2V @ 3A	9	15 mA	Active	ROHS3 Compliant
LP3966ES-2.5/NOPB	Texas Instruments	2.5V	3A	1.2V @ 3A	9	15 mA	Active	ROHS3 Compliant
LP3853ES-2.5	Texas Instruments	2.5V	3A	0.6V @ 3A	4	10 mA	Last Time Buy	ROHS3 Compliant

Engineering Selection Recommendations

For Active Production Designs:

LP3876ES-2.5/NOPB is the direct equivalent with Active product status and ROHS3 compliance. This part maintains identical electrical specifications to the original LP3876ES-2.5 while offering improved regulatory compliance.

For Designs Prioritizing Lower Power Consumption:

LP3853ES-2.5/NOPB and LP3856ES-2.5/NOPB offer reduced quiescent current (4 mA vs. 5 mA) and lower maximum supply current (10 mA vs. 15 mA), along with improved dropout voltage performance (0.6V vs. 1.2V @ 3A). Both parts maintain 3A output current and 2.5V fixed output in TO-263 packaging. LP3853ES-2.5/NOPB carries Active status and ROHS3 compliance from Texas Instruments.

For Designs with Existing National Semiconductor Qualification:

LP3856ES-2.5/NOPB and LP3873ES-2.5/NOPB are National Semiconductor alternatives. LP3856ES-2.5/NOPB provides superior dropout voltage (0.6V), while LP3873ES-2.5/NOPB matches the original dropout specification (1.2V). Both maintain Active product status.

For High-Volume Procurement:

LP3963ES-2.5/NOPB and LP3966ES-2.5/NOPB from Texas Instruments offer Active status and ROHS3 compliance with higher inventory availability. These parts match the original electrical specifications including 1.2V dropout voltage and 5 mA quiescent current baseline.

Avoid:

LP3853ES-2.5 (without /NOPB suffix) carries Last Time Buy status and should not be selected for new designs despite its superior electrical performance.

Frequently Asked Questions (FAQ)

Q: Can LP3876ES-2.5 be directly replaced with LP3876ES-2.5/NOPB?

A: Yes. LP3876ES-2.5/NOPB is the direct equivalent with identical electrical specifications. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant). Pin configuration and package type are identical.

Q: What is the difference between LP3853ES-2.5/NOPB and LP3876ES-2.5/NOPB?

A: Both provide 2.5V at 3A in TO-263 packaging. LP3853ES-2.5/NOPB offers improved performance with lower dropout voltage (0.6V vs. 1.2V @ 3A), lower quiescent current (4 mA vs. 5 mA), and reduced supply current (10 mA vs. 15 mA). These differences may impact thermal performance and power efficiency in battery-powered or thermally constrained applications.

Q: Are National Semiconductor parts (LP3856ES-2.5/NOPB, LP3873ES-2.5/NOPB) compatible with Texas Instruments designs?

A: Yes, from an electrical and mechanical standpoint. Both manufacturers' parts meet the same output voltage (2.5V), output current (3A), and TO-263 package requirements. Verify qualification status within your organization's component approval process.

Q: What does the /NOPB suffix indicate?

A: The /NOPB suffix indicates the part is supplied without lead (Pb), reflecting RoHS compliance. Parts with this designation are ROHS3 compliant and suitable for applications requiring lead-free components.

Q: Can I use LP3853ES-2.5/NOPB as a drop-in replacement if my design was qualified with LP3876ES-2.5?

A: Electrical compatibility is confirmed. However, the improved dropout voltage and reduced quiescent current of LP3853ES-2.5/NOPB may alter thermal behavior and power dissipation characteristics. Thermal analysis should be performed to confirm suitability for your specific application.

Q: Which substitute part has the best availability?

A: LP3963ES-2.5/NOPB shows the highest inventory level (2200 Pcs) among active substitutes, followed by LP3856ES-2.5/NOPB (1203 Pcs) and LP3853ES-2.5/NOPB (1087 Pcs).

Q: Is the TO-263 package identical across all listed parts?

A: Yes. All parts use TO-263-6 (D2PAK with 5 Leads + Tab) surface mount packaging. PCB footprint and thermal pad dimensions are equivalent across all listed substitutes.

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