LP3964ES-2.5 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3964ES-2.5 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 2.5V output at 800mA in a TO-263 (DDPAK-5) surface mount package. This device provides positive fixed output configuration with integrated protection features including over-current, over-temperature, and short-circuit protection. The main part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	800mA
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.35V @ 800mA
Quiescent Current (Iq)	9mA (typical)
Package Type	TO-263 (DDPAK-5)
Mounting Type	Surface Mount
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitute parts for the LP3964ES-2.5 are classified based on strict electrical and mechanical parameter matching:

Direct Equivalent: LP3964ES-2.5/NOPB maintains identical electrical specifications and package configuration as the main part, with the primary distinction being product status (Active vs. Obsolete) and RoHS compliance upgrade (ROHS3 Compliant).

Parametric Equivalents: LP3871ES-2.5/NOPB, LP3874ES-2.5/NOPB, and LP3961ES-2.5/NOPB share the following critical parameters with the main part:

Fixed 2.5V output voltage
800mA output current capability
7V maximum input voltage
0.35V maximum dropout voltage at 800mA
TO-263 (DDPAK-5) package configuration
Surface mount mounting type
-40°C to 125°C operating temperature range
Enable control feature
Over-current, over-temperature, and short-circuit protection

Variations in quiescent current (5mA vs. 9mA) and PSRR specifications do not affect functional substitution for applications where the main part specifications are met.

Parameter Comparison

Parameter	LP3964ES-2.5	LP3964ES-2.5/NOPB	LP3871ES-2.5/NOPB	LP3874ES-2.5/NOPB	LP3961ES-2.5/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	National Semiconductor	Texas Instruments
Output Voltage	2.5V	2.5V	2.5V	2.5V	2.5V
Output Current	800mA	800mA	800mA	800mA	800mA
Input Voltage (Max)	7V	7V	7V	7V	7V
Voltage Dropout (Max)	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA
Quiescent Current (Iq)	9mA	9mA	5mA	9mA	9mA
Package Type	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

For New Designs: LP3964ES-2.5/NOPB is the primary recommendation as the direct equivalent with Active product status and ROHS3 compliance. This part maintains identical electrical and mechanical specifications while offering improved regulatory compliance and ongoing manufacturer support.

For Low-Power Applications: LP3871ES-2.5/NOPB offers reduced quiescent current (5mA vs. 9mA), providing power efficiency benefits in battery-powered or standby-mode applications while maintaining all other critical parameters.

For High-Volume Production: LP3961ES-2.5/NOPB provides the highest inventory availability (5099 pcs) with Active product status and ROHS3 compliance, supporting extended production runs without supply constraints.

For Legacy System Maintenance: LP3874ES-2.5/NOPB from National Semiconductor maintains full electrical and mechanical compatibility, though RoHS compliance status is not specified in available documentation.

All substitute parts are qualified for the same operating temperature range (-40°C to 125°C) and provide identical protection features (over-current, over-temperature, short-circuit).

Frequently Asked Questions (FAQ)

Q: Can LP3964ES-2.5/NOPB be used as a direct replacement for LP3964ES-2.5?

A: Yes. LP3964ES-2.5/NOPB is the direct equivalent with identical electrical specifications (2.5V output, 800mA current, 0.35V dropout), package configuration (TO-263 DDPAK-5), and operating temperature range. The primary differences are product status (Active vs. Obsolete) and RoHS compliance (ROHS3 Compliant).

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

A: LP3871ES-2.5/NOPB has reduced quiescent current (5mA vs. 9mA), making it suitable for applications prioritizing power efficiency. All other electrical parameters and package specifications remain identical to the main part.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use the TO-263 (DDPAK-5) surface mount package, ensuring identical PCB layout and thermal management characteristics.

Q: Which substitute part has the best availability?

A: LP3961ES-2.5/NOPB has the highest inventory level at 5099 pcs, followed by LP3871ES-2.5/NOPB at 1900 pcs.

Q: Do all substitute parts meet RoHS requirements?

A: LP3964ES-2.5/NOPB, LP3871ES-2.5/NOPB, and LP3961ES-2.5/NOPB are ROHS3 Compliant. RoHS status for LP3874ES-2.5/NOPB is not specified in available documentation.

Q: Can these parts be used interchangeably in existing designs?

A: Yes, for applications where the specified electrical parameters (2.5V output, 800mA current, 0.35V dropout, -40°C to 125°C operating range) are met. Pin configuration and package footprint are identical across all parts.

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