LP3871ES-2.5 Equivalent & Substitute Parts

Part Overview

The LP3871ES-2.5 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed 2.5V output at 800mA with a maximum dropout voltage of 0.35V, housed in a TO-263 (DDPAK-5) surface mount package. The main part number LP3871ES-2.5 is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design support and production continuity. Active alternatives with identical or compatible electrical specifications are available from Texas Instruments and National Semiconductor.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	800mA
Maximum Input Voltage	7V
Dropout Voltage (Max)	0.35V @ 800mA
Quiescent Current	5 mA (main part); 9 mA (substitutes)
Package Type	TO-263-6 (D2PAK, 5 Leads + Tab)
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution eligibility for the LP3871ES-2.5 is determined by the following critical parameters:

Output voltage: 2.5V fixed
Output current capability: 800mA
Maximum input voltage: 7V
Dropout voltage: 0.35V @ 800mA
Package: TO-263 (DDPAK-5)
Operating temperature range: -40°C to 125°C
Protection features: Over Current, Over Temperature, Short Circuit

All substitute parts listed maintain these core electrical specifications and package compatibility. Variations in quiescent current (Iq) and PSRR do not affect substitution eligibility for this application category, as the primary function—delivering 2.5V at 800mA with specified dropout performance—remains unchanged.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Voltage	Output Current	Dropout Voltage	Quiescent Current	Package	RoHS Status	Inventory
LP3871ES-2.5	Texas Instruments	Obsolete	2.5V	800mA	0.35V @ 800mA	5 mA	TO-263-6	RoHS non-compliant	5846 Pcs
LP3871ES-2.5/NOPB	Texas Instruments	Active	2.5V	800mA	0.35V @ 800mA	5 mA	TO-263-6	ROHS3 Compliant	1900 Pcs
LP3874ES-2.5/NOPB	National Semiconductor	Active	2.5V	800mA	0.35V @ 800mA	9 mA	TO-263-6	Not specified	1264 Pcs
LP3961ES-2.5/NOPB	Texas Instruments	Active	2.5V	800mA	0.35V @ 800mA	9 mA	TO-263-6	ROHS3 Compliant	5099 Pcs
LP3964ES-2.5/NOPB	Texas Instruments	Active	2.5V	800mA	0.35V @ 800mA	9 mA	TO-263-6	ROHS3 Compliant	993 Pcs

Engineering Selection Recommendations

For applications currently using the obsolete LP3871ES-2.5, the following selection criteria apply:

Direct Replacement (Identical Specifications): LP3871ES-2.5/NOPB is the direct equivalent, maintaining the original 5 mA quiescent current specification while upgrading to ROHS3 compliance and active product status. This part is recommended for designs requiring no performance changes.

Parametric Equivalents (Functional Compatibility): LP3961ES-2.5/NOPB, LP3964ES-2.5/NOPB, and LP3874ES-2.5/NOPB are parametric equivalents with identical electrical performance for the primary function (2.5V, 800mA output). These parts feature 9 mA quiescent current, which is acceptable in applications where the additional 4 mA standby current does not impact system power budgets. All Texas Instruments alternatives (LP3961ES-2.5/NOPB and LP3964ES-2.5/NOPB) are ROHS3 compliant and active products.

Compliance Considerations: For new designs or production requiring RoHS compliance, select from LP3871ES-2.5/NOPB, LP3961ES-2.5/NOPB, or LP3964ES-2.5/NOPB. The LP3874ES-2.5/NOPB from National Semiconductor maintains full electrical compatibility but RoHS status is not specified in available documentation.

Frequently Asked Questions (FAQ)

Q: Can LP3961ES-2.5/NOPB or LP3964ES-2.5/NOPB replace LP3871ES-2.5 in existing designs?

A: Yes. Both parts deliver identical output voltage (2.5V), output current (800mA), and dropout voltage (0.35V @ 800mA) in the same TO-263 package. The quiescent current increases from 5 mA to 9 mA, which is acceptable for most applications unless the design has strict standby power constraints.

Q: What is the difference between LP3871ES-2.5/NOPB and the original LP3871ES-2.5?

A: LP3871ES-2.5/NOPB is the active production equivalent with ROHS3 compliance. The electrical specifications and package are identical. The original part is obsolete; the /NOPB variant is the recommended replacement.

Q: Are all substitute parts in the same package?

A: Yes. All listed parts use the TO-263-6 (D2PAK, 5 Leads + Tab) package, ensuring direct PCB compatibility without layout modifications.

Q: Does the difference in quiescent current between LP3871ES-2.5 (5 mA) and LP3961ES-2.5/NOPB (9 mA) affect circuit performance?

A: No. The 4 mA difference in quiescent current does not affect output voltage regulation, dropout performance, or load current capability. It impacts only standby power consumption. Evaluate this difference only if your application has power budget constraints below 10 mA.

Q: Which substitute part has the highest inventory availability?

A: LP3961ES-2.5/NOPB has 5099 pieces in stock, followed by LP3871ES-2.5/NOPB with 1900 pieces. Both are Texas Instruments products with ROHS3 compliance and active status.

Q: Can LP3874ES-2.5/NOPB from National Semiconductor be used as a substitute?

A: Yes. LP3874ES-2.5/NOPB is a parametric equivalent with identical electrical specifications and package. However, RoHS compliance status is not documented. Verify compliance requirements for your application before selection.

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