LP3871EMP-2.5 Equivalent & Substitute Parts

Part Overview

The LP3871EMP-2.5 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive 2.5V output at 800mA with a maximum dropout voltage of 0.35V, housed in a SOT-223-5 surface mount package. The device includes integrated protection features for overcurrent, overtemperature, and short circuit conditions, with an enable control feature for power management applications.

The LP3871EMP-2.5 is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance of systems utilizing this regulator.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	800mA
Input Voltage (Max)	7V
Dropout Voltage (Max)	0.35V @ 800mA
Quiescent Current (Iq)	5mA
Package Type	SOT-223-5
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature Range	-40°C to 125°C
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitute parts for the LP3871EMP-2.5 are classified based on strict electrical and mechanical parameter matching:

Critical Parameters for Substitution:

Output voltage: 2.5V (fixed)
Output current capability: 800mA
Maximum input voltage: 7V
Dropout voltage: 0.35V @ 800mA
Package: SOT-223-5 (TO-261-5, TO-261AB)
Control features: Enable function
Protection: Overcurrent, overtemperature, short circuit

All identified substitute parts maintain these core electrical specifications and package compatibility. Variations in quiescent current (Iq) and PSRR specifications do not affect functional substitution when these critical parameters are matched.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Iq (mA)	Package	Product Status	RoHS Status
LP3871EMP-2.5	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	5	SOT-223-5	Obsolete	RoHS Non-Compliant
LP3871EMP-2.5/NOPB	National Semiconductor	2.5V	800mA	7V	0.35V @ 800mA	5	SOT-223	Active	Not Specified
LP3874EMP-2.5/NOPB	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9	SOT-223-5	Active	RoHS3 Compliant
LP3961EMP-2.5	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9	SOT-223-5	Last Time Buy	RoHS3 Compliant
LP3961EMP-2.5/NOPB	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9	SOT-223-5	Active	RoHS3 Compliant
LP3964EMP-2.5/NOPB	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9	SOT-223-5	Active	RoHS3 Compliant
LP3964EMPX-2.5/NOPB	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9	SOT-223-5	Active	RoHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: LP3961EMP-2.5/NOPB or LP3964EMP-2.5/NOPB

Both parts are manufactured by Texas Instruments with Active product status and RoHS3 compliance. These represent the most current alternatives with full regulatory compliance and ongoing manufacturer support. The quiescent current increase from 5mA to 9mA is within acceptable tolerance for most applications and does not affect core functionality.

Secondary Recommendation: LP3874EMP-2.5/NOPB

This Texas Instruments part maintains Active status and RoHS3 compliance. It provides an alternative with identical electrical specifications to the primary recommendations.

Alternative: LP3871EMP-2.5/NOPB

This National Semiconductor variant maintains the original 5mA quiescent current specification and Active product status. However, RoHS compliance status is not specified in available documentation.

Not Recommended for New Designs: LP3961EMP-2.5

This part carries Last Time Buy status, indicating limited future availability. While electrically equivalent and RoHS3 compliant, it should not be selected for new production designs.

Frequently Asked Questions (FAQ)

Q: Can LP3874EMP-2.5/NOPB replace LP3871EMP-2.5 in existing designs?

A: Yes. Both parts deliver 2.5V at 800mA with 0.35V maximum dropout voltage in SOT-223-5 packaging. The quiescent current difference (9mA vs. 5mA) is a minor variation that does not affect circuit functionality in standard applications.

Q: What is the difference between LP3961EMP-2.5 and LP3961EMP-2.5/NOPB?

A: Both are Texas Instruments parts with identical electrical specifications. The /NOPB designation indicates lead-free (no lead) and halogen-free packaging. LP3961EMP-2.5/NOPB has Active status, while LP3961EMP-2.5 is Last Time Buy. Select the /NOPB variant for new designs.

Q: Are all substitute parts RoHS compliant?

A: Most substitute parts are RoHS3 compliant. The original LP3871EMP-2.5 is RoHS non-compliant, and LP3871EMP-2.5/NOPB has unspecified RoHS status. For applications requiring RoHS compliance, select LP3874EMP-2.5/NOPB, LP3961EMP-2.5/NOPB, LP3964EMP-2.5/NOPB, or LP3964EMPX-2.5/NOPB.

Q: Do all substitute parts use the same SOT-223-5 package?

A: LP3871EMP-2.5/NOPB uses SOT-223 packaging. All other substitutes use SOT-223-5. Both are compatible with TO-261-5 and TO-261AB footprints. Verify PCB layout compatibility before final selection.

Q: Which substitute part has the best long-term availability?

A: LP3964EMP-2.5/NOPB and LP3964EMPX-2.5/NOPB are both Active status parts from Texas Instruments with RoHS3 compliance, indicating strong ongoing availability and manufacturer support.

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