LP3964EMP-2.5 Equivalent & Substitute Parts

Part Overview

The LP3964EMP-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 800mA with a maximum dropout voltage of 0.35V. The device integrates over-current, over-temperature, and short-circuit protection, operating across the industrial temperature range of -40°C to 125°C in a surface-mount SOT-223-5 package.

The LP3964EMP-2.5 carries a product status of "Not For New Designs," indicating it is no longer recommended for new circuit implementations. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and transition to actively supported alternatives where applicable.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	800mA
Maximum Input Voltage	7V
Maximum Dropout Voltage	0.35V @ 800mA
Quiescent Current	9mA
Output Configuration	Positive Fixed
Package Type	SOT-223-5 (TO-261-5, TO-261AB)
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature Range	-40°C to 125°C

Substitute Part Grouping Explanation

Substitution eligibility for the LP3964EMP-2.5 is determined by strict equivalence across the following critical parameters:

Output voltage: 2.5V fixed
Output current capability: 800mA
Maximum input voltage: 7V
Dropout voltage: 0.35V @ 800mA
Output configuration: Positive fixed
Package type: SOT-223-5 (TO-261-5, TO-261AB)
Protection features: Over-current, over-temperature, short-circuit
Operating temperature: -40°C to 125°C
Mounting type: Surface mount

All identified substitute parts meet these electrical and mechanical specifications. Differences in product status, RoHS compliance, quiescent current, and packaging format (bulk, cut tape, tape & reel) do not affect functional equivalence but may influence procurement and design lifecycle considerations.

Parameter Comparison

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

Engineering Selection Recommendations

Primary Recommendation: LP3964EMP-2.5/NOPB

The LP3964EMP-2.5/NOPB is the direct active equivalent of the original LP3964EMP-2.5. It maintains identical electrical specifications and package configuration while offering Active product status and RoHS3 compliance. This part is suitable for new designs and provides the most direct replacement path.

Secondary Recommendation: LP3964EMPX-2.5/NOPB

The LP3964EMPX-2.5/NOPB shares all electrical and mechanical specifications with LP3964EMP-2.5/NOPB and carries Active status with RoHS3 compliance. The "X" suffix indicates extended temperature or processing variation; electrical performance remains equivalent.

Alternative: LP3874EMP-2.5/NOPB

The LP3874EMP-2.5/NOPB from Texas Instruments is functionally equivalent with Active product status and RoHS3 compliance. It maintains the same output voltage, current, dropout voltage, and operating temperature range. This part is suitable for designs requiring an alternative from the same manufacturer.

Alternative: LP3961EMP-2.5/NOPB

The LP3961EMP-2.5/NOPB is an Active, RoHS3-compliant alternative with identical electrical specifications. It provides a viable substitute for applications requiring a different part number within the Texas Instruments portfolio.

Consideration: LP3871EMP-2.5/NOPB

The LP3871EMP-2.5/NOPB from National Semiconductor meets all electrical specifications and carries Active status. It features lower quiescent current (5mA versus 9mA), which may provide power efficiency benefits in battery-powered or low-power applications. The SOT-223 package is mechanically compatible with SOT-223-5 footprints.

Avoid: LP3961EMP-2.5

The LP3961EMP-2.5 (without /NOPB suffix) carries Last Time Buy status, indicating end-of-life. While electrically equivalent and RoHS3 compliant, this part is not recommended for new designs due to limited future availability.

Frequently Asked Questions (FAQ)

Q: Can LP3964EMP-2.5 be directly replaced with LP3964EMP-2.5/NOPB?

A: Yes. Both parts are electrically and mechanically identical. The /NOPB suffix indicates "No Lead (Pb)" and represents the RoHS3-compliant version. Direct substitution is valid for all applications.

Q: What is the difference between LP3964EMP-2.5 and LP3874EMP-2.5/NOPB?

A: Both deliver 2.5V at 800mA with 0.35V dropout and operate across -40°C to 125°C. The primary difference is product status: LP3964EMP-2.5 is "Not For New Designs," while LP3874EMP-2.5/NOPB is Active. Electrical performance is equivalent.

Q: Is LP3871EMP-2.5/NOPB a suitable substitute?

A: Yes, with a design consideration. The LP3871EMP-2.5/NOPB meets all electrical specifications and offers lower quiescent current (5mA versus 9mA). The SOT-223 package is mechanically compatible with SOT-223-5 footprints. Verify PCB layout compatibility before implementation.

Q: Why does LP3961EMP-2.5 show "Last Time Buy" status?

A: Last Time Buy status indicates the manufacturer is discontinuing the part. While currently available and functionally equivalent, procurement windows are limited. For new designs, select parts with Active status such as LP3961EMP-2.5/NOPB or LP3964EMP-2.5/NOPB.

Q: Are all substitute parts RoHS compliant?

A: No. The original LP3964EMP-2.5 is RoHS non-compliant. Most substitutes (LP3874EMP-2.5/NOPB, LP3961EMP-2.5/NOPB, LP3964EMP-2.5/NOPB, LP3964EMPX-2.5/NOPB) are RoHS3 compliant. LP3871EMP-2.5/NOPB compliance status is not specified in available data.

Q: Can packaging format differences affect substitution?

A: Packaging format (bulk, cut tape, tape & reel) affects procurement and assembly processes but does not affect electrical or mechanical compatibility. All parts use the same SOT-223-5 or compatible SOT-223 package footprint.

Q: What is the significance of the "X" in LP3964EMPX-2.5/NOPB?

A: The "X" suffix typically indicates a processing or temperature variation. Electrical specifications remain identical to LP3964EMP-2.5/NOPB. Both are suitable for equivalent applications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message