LP3871EMPX-2.5 Equivalent & Substitute Parts

Part Overview

The LP3871EMPX-2.5 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed 2.5V output at 800mA with a maximum dropout voltage of 0.35V, housed in a SOT-223-5 surface mount package. The part is currently listed as obsolete, making identification of functional equivalents essential for ongoing design support and production continuity. Substitute parts must maintain identical electrical performance characteristics and mechanical compatibility to ensure direct replacement capability.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP3871EMPX-2.5
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Package / Case	TO-261-5, TO-261AB
Supplier Device Package	SOT-223-5
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	2.5V
Current - Output	800mA
Voltage - Input (Max)	7V
Voltage Dropout (Max)	0.35V @ 800mA
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the LP3871EMPX-2.5 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Output voltage: 2.5V fixed
Output current: 800mA
Maximum input voltage: 7V
Maximum dropout voltage: 0.35V @ 800mA
Package type: SOT-223-5 (TO-261-5, TO-261AB)
Output configuration: Positive
Control features: Enable function
Protection features: Over Current, Over Temperature, Short Circuit

All identified substitute parts maintain these specifications. Variations in quiescent current (Iq), PSRR ratings, and product status do not affect functional substitution capability, as these parameters remain within acceptable operational ranges for the intended application.

Parameter Comparison

Parameter	LP3871EMPX-2.5	LP3871EMP-2.5/NOPB	LP3874EMP-2.5/NOPB	LP3961EMP-2.5	LP3961EMP-2.5/NOPB	LP3964EMP-2.5/NOPB	LP3964EMPX-2.5/NOPB
Manufacturer	Texas Instruments	National Semiconductor	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Output Voltage (Fixed)	2.5V	2.5V	2.5V	2.5V	2.5V	2.5V	2.5V
Output Current	800mA	800mA	800mA	800mA	800mA	800mA	800mA
Input Voltage (Max)	7V	7V	7V	7V	7V	7V	7V
Dropout Voltage (Max)	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA
Package / Case	TO-261-5, TO-261AB	TO-261-5, TO-261AB	TO-261-5, TO-261AB	TO-261-5, TO-261AB	TO-261-5, TO-261AB	TO-261-5, TO-261AB	TO-261-5, TO-261AB
Supplier Device Package	SOT-223-5	SOT-223	SOT-223-5	SOT-223-5	SOT-223-5	SOT-223-5	SOT-223-5
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Control Features	Enable	Enable	Enable	Enable	Enable	Enable	Enable
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, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Product Status	Obsolete	Active	Active	Last Time Buy	Active	Active	Active
RoHS Status	RoHS non-compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Active Production Requirements: LP3961EMP-2.5/NOPB and LP3964EMP-2.5/NOPB are recommended as primary substitutes. Both parts maintain active product status with ROHS3 compliance certification, ensuring long-term availability and regulatory alignment for new designs and ongoing production.

For Legacy System Support: LP3871EMP-2.5/NOPB provides direct functional equivalence with the original LP3871EMPX-2.5, maintaining identical electrical specifications. This part is suitable for repair and maintenance of existing systems where component continuity is required.

For Extended Lifecycle Applications: LP3964EMPX-2.5/NOPB offers active status with ROHS3 compliance and represents the most current variant within the LP3964 series, providing optimal long-term supply chain stability.

Compliance Considerations: All substitute parts except LP3871EMP-2.5/NOPB carry ROHS3 compliance certification. The original LP3871EMPX-2.5 is RoHS non-compliant. For applications requiring regulatory compliance with modern environmental standards, selection of ROHS3-compliant alternatives is necessary.

Frequently Asked Questions (FAQ)

Q: Can LP3871EMP-2.5/NOPB directly replace LP3871EMPX-2.5? A: Yes. Both parts share identical electrical specifications including 2.5V fixed output, 800mA current capacity, 0.35V maximum dropout voltage, and SOT-223-5 packaging. The primary difference is product status (Active vs. Obsolete) and packaging format (Bulk vs. standard).

Q: What is the difference between LP3961EMP-2.5 and LP3961EMP-2.5/NOPB? A: Both parts are electrically identical with matching output voltage, current rating, and dropout specifications. LP3961EMP-2.5/NOPB carries active product status, while LP3961EMP-2.5 is designated Last Time Buy. For new designs, LP3961EMP-2.5/NOPB is the preferred selection.

Q: Are LP3964EMP-2.5/NOPB and LP3964EMPX-2.5/NOPB interchangeable? A: Yes. Both variants maintain identical electrical performance with 2.5V output, 800mA capacity, and 0.35V dropout voltage. Both are active products with ROHS3 compliance and SOT-223-5 packaging.

Q: Does quiescent current variation affect substitution compatibility? A: No. The LP3871EMPX-2.5 specifies 5mA quiescent current, while LP3874EMP-2.5/NOPB, LP3961EMP-2.5, LP3961EMP-2.5/NOPB, LP3964EMP-2.5/NOPB, and LP3964EMPX-2.5/NOPB specify 9mA. This variation does not impact functional substitution, as both values remain within acceptable operational parameters for the intended application.

Q: What packaging options are available for substitutes? A: All substitute parts use SOT-223-5 surface mount packaging with TO-261-5 and TO-261AB case designations. LP3871EMP-2.5/NOPB is supplied in Bulk format, while LP3874EMP-2.5/NOPB, LP3961EMP-2.5, LP3961EMP-2.5/NOPB, LP3964EMP-2.5/NOPB, and LP3964EMPX-2.5/NOPB are available in Cut Tape (CT) & Digi-Reel or Tape & Reel (TR) formats.

Q: Which substitute offers the best long-term availability? A: LP3964EMPX-2.5/NOPB and LP3964EMP-2.5/NOPB are recommended for long-term applications. Both maintain active product status with ROHS3 compliance and represent the current generation within the LP3964 series, providing optimal supply chain continuity.

Q: Is RoHS compliance required for my application? A: If regulatory compliance with modern environmental standards is required, select from LP3874EMP-2.5/NOPB, LP3961EMP-2.5, LP3961EMP-2.5/NOPB, LP3964EMP-2.5/NOPB, or LP3964EMPX-2.5/NOPB, all of which carry ROHS3 certification. The original LP3871EMPX-2.5 and LP3871EMP-2.5/NOPB are RoHS non-compliant.

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