LP3876ET-2.5 Equivalent & Substitute Parts

Part Overview

The LP3876ET-2.5 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive output of 2.5V at 3A in a TO-220-5 package. The device is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. This reference provides direct equivalents and parametric alternatives suitable for applications requiring 2.5V fixed output regulation at 3A output current.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	3A
Input Voltage (Max)	7V
Voltage Dropout (Max)	1.2V @ 3A
Quiescent Current	5 mA
Package / Case	TO-220-5 Formed Leads
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution for the LP3876ET-2.5 is determined by the following critical parameters:

Output Voltage: 2.5V fixed (all substitutes maintain this specification)
Output Current: 3A minimum capability
Package Type: TO-220-5 Formed Leads (mechanical and thermal compatibility)
Operating Temperature Range: -40°C ~ 125°C
Protection Features: Over Current, Over Temperature, and Short Circuit protection
Control Features: Enable function

Substitute parts are grouped into three categories based on their relationship to the main part:

Direct Manufacturer Equivalent: LP3876ET-2.5/NOPB maintains identical electrical specifications and is the direct replacement from National Semiconductor.

Parametric Equivalents: LP3853ET-2.5/NOPB and LP3856ET-2.5/NOPB from Texas Instruments provide superior performance characteristics (lower dropout voltage, lower quiescent current, improved PSRR) while maintaining the same output voltage, current rating, package, and temperature range.

Manufacturer Recommended Alternative: LT1764AET-2.5#PBF from Analog Devices Inc. offers enhanced specifications including higher input voltage rating (20V vs. 7V) and lower quiescent current (1.5 mA vs. 5 mA), with reverse polarity protection in addition to standard protections.

Parameter Comparison

Parameter	LP3876ET-2.5	LP3876ET-2.5/NOPB	LP3853ET-2.5/NOPB	LP3856ET-2.5/NOPB	LT1764AET-2.5#PBF
Manufacturer	Texas Instruments	National Semiconductor	Texas Instruments	Texas Instruments	Analog Devices Inc.
Product Status	Obsolete	Active	Active	Active	Active
Output Voltage	2.5V	2.5V	2.5V	2.5V	2.5V
Output Current	3A	3A	3A	3A	3A
Input Voltage (Max)	7V	7V	7V	7V	20V
Voltage Dropout (Max)	1.2V @ 3A	1.2V @ 3A	0.6V @ 3A	0.6V @ 3A	0.66V @ 3A
Quiescent Current	5 mA	5 mA	4 mA	4 mA	1.5 mA
Supply Current (Max)	15 mA	15 mA	10 mA	10 mA	200 mA
PSRR	—	—	73dB ~ 57dB (120Hz)	73dB ~ 57dB (120Hz)	63dB (120Hz)
Package / Case	TO-220-5 Formed Leads	TO-220-5 Formed Leads	TO-220-5 Formed Leads	TO-220-5 Formed Leads	TO-220-5
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C (TJ)
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Reverse Polarity
RoHS Status	RoHS non-compliant	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	—	Bulk	Tube	Tube	Tube

Engineering Selection Recommendations

For Direct Replacement: LP3876ET-2.5/NOPB is the direct equivalent from National Semiconductor, maintaining identical electrical specifications and package configuration. This part is currently active in production.

For Enhanced Performance: LP3853ET-2.5/NOPB and LP3856ET-2.5/NOPB from Texas Instruments provide improved performance with 50% reduction in dropout voltage (0.6V vs. 1.2V) and lower quiescent current (4 mA vs. 5 mA). Both parts are ROHS3 compliant and actively produced. These are suitable for applications where lower power dissipation and improved efficiency are beneficial.

For Extended Input Voltage Range: LT1764AET-2.5#PBF from Analog Devices Inc. accommodates input voltages up to 20V (compared to 7V maximum for other options) and features the lowest quiescent current at 1.5 mA. This part includes reverse polarity protection and is ROHS3 compliant. Selection of this part is appropriate for applications requiring higher input voltage tolerance or where quiescent current minimization is critical.

All substitute parts maintain the same output voltage (2.5V), output current (3A), package type (TO-220-5), operating temperature range (-40°C ~ 125°C), and core protection features (Over Current, Over Temperature, Short Circuit).

Frequently Asked Questions (FAQ)

Q: Can LP3876ET-2.5/NOPB be used as a direct replacement for LP3876ET-2.5?

A: Yes. LP3876ET-2.5/NOPB is the direct equivalent with identical electrical specifications, output voltage (2.5V), output current (3A), dropout voltage (1.2V @ 3A), and TO-220-5 package configuration. The primary difference is product status: the original is obsolete while the /NOPB variant is active.

Q: What is the advantage of using LP3853ET-2.5/NOPB or LP3856ET-2.5/NOPB over the original LP3876ET-2.5?

A: Both parts reduce dropout voltage from 1.2V to 0.6V at 3A output current and lower quiescent current from 5 mA to 4 mA. These improvements reduce power dissipation and heat generation. Both are ROHS3 compliant and actively produced, providing better long-term supply availability.

Q: When should LT1764AET-2.5#PBF be selected?

A: LT1764AET-2.5#PBF is appropriate when the application requires input voltages exceeding 7V (up to 20V maximum) or when minimizing quiescent current is essential (1.5 mA vs. 5 mA). The part also includes reverse polarity protection. All parts maintain 2.5V output voltage and 3A output current capability.

Q: Are all substitute parts compatible with the TO-220-5 package footprint?

A: Yes. All substitute parts use TO-220-5 package configuration with formed leads, ensuring mechanical and thermal compatibility with existing PCB designs. No layout modifications are required for package substitution.

Q: What is the operating temperature range for all parts?

A: All parts operate across -40°C to 125°C, meeting the same temperature specification. This ensures thermal performance consistency across all substitutes.

Q: Do all substitute parts include the same protection features?

A: All parts include Over Current, Over Temperature, and Short Circuit protection. LT1764AET-2.5#PBF additionally includes Reverse Polarity protection, providing enhanced circuit protection.

Q: Are there RoHS compliance differences between the parts?

A: The original LP3876ET-2.5 is RoHS non-compliant. All active substitutes (LP3876ET-2.5/NOPB, LP3853ET-2.5/NOPB, LP3856ET-2.5/NOPB, and LT1764AET-2.5#PBF) are ROHS3 compliant, meeting current environmental regulations.

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