LP3876ES-2.5/NOPB Equivalent & Substitute Parts

Part Overview

The LP3876ES-2.5/NOPB 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 3A maximum current in a TO-263 (DDPAK-5) surface mount package. The device features integrated protection against overcurrent, overtemperature, and short circuit conditions, with an enable control feature for power management applications.

The LP3876ES-2.5/NOPB is currently in Active product status with 1259 units in stock. Identifying equivalent and substitute parts is essential for supply chain continuity, design flexibility, and managing component availability across manufacturing cycles.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP3876ES-2.5/NOPB
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	2.5V
Output Current	3A
Maximum Input Voltage	7V
Maximum Dropout Voltage	1.2V @ 3A
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Mounting Type	Surface Mount
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the LP3876ES-2.5/NOPB are qualified based on the following critical parameters that determine functional interchangeability:

Fixed output voltage of 2.5V
Output current capability of 3A
Maximum input voltage of 7V
Surface mount TO-263 (DDPAK-5) package configuration
Positive output configuration with single regulator
Enable control feature
Protection features: Over Current, Over Temperature, Short Circuit
Operating temperature range of -40°C to 125°C

All identified substitute parts meet these core electrical and mechanical requirements. Variations in dropout voltage, quiescent current, and PSRR performance are secondary parameters that may influence selection based on specific application requirements but do not disqualify substitution eligibility.

Parameter Comparison

Parameter	LP3876ES-2.5/NOPB	LP3853ES-2.5/NOPB	LP3856ES-2.5/NOPB	LP3873ES-2.5/NOPB	LP3963ES-2.5/NOPB	LP3966ES-2.5/NOPB	LP3853ES-2.5
Manufacturer	Texas Instruments	Texas Instruments	National Semiconductor	National Semiconductor	Texas Instruments	Texas Instruments	Texas Instruments
Output Voltage	2.5V	2.5V	2.5V	2.5V	2.5V	2.5V	2.5V
Output Current	3A	3A	3A	3A	3A	3A	3A
Maximum Input Voltage	7V	7V	7V	7V	7V	7V	7V
Dropout Voltage @ 3A	1.2V	0.6V	0.6V	1.2V	1.2V	1.2V	0.6V
Quiescent Current	5 mA	4 mA	4 mA	9 mA	9 mA	9 mA	4 mA
Supply Current (Max)	15 mA	10 mA	10 mA	15 mA	15 mA	15 mA	10 mA
PSRR	—	73dB ~ 57dB (120Hz)	73dB ~ 57dB (120Hz)	73dB ~ 57dB (120Hz)	—	—	73dB ~ 57dB (120Hz)
Package	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)	TO-263 (DDPAK-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
Product Status	Active	Active	Active	Active	Active	Active	Last Time Buy
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts listed are electrically and mechanically compatible with the LP3876ES-2.5/NOPB based on core functional parameters. Selection among these alternatives should be guided by the following factors:

Active Product Status Priority: LP3853ES-2.5/NOPB, LP3856ES-2.5/NOPB, LP3873ES-2.5/NOPB, LP3963ES-2.5/NOPB, and LP3966ES-2.5/NOPB are all in Active status, ensuring long-term availability and supply chain stability. LP3853ES-2.5 carries Last Time Buy status and should be avoided for new designs requiring extended production lifecycles.

RoHS Compliance: For applications requiring ROHS3 compliance, select from LP3853ES-2.5/NOPB, LP3963ES-2.5/NOPB, LP3966ES-2.5/NOPB, or LP3853ES-2.5. LP3856ES-2.5/NOPB and LP3873ES-2.5/NOPB do not specify RoHS status in available documentation.

Dropout Voltage Considerations: LP3853ES-2.5/NOPB, LP3856ES-2.5/NOPB, and LP3853ES-2.5 offer reduced dropout voltage of 0.6V at 3A, compared to 1.2V for the main part. This provides improved efficiency in applications with tight input-to-output voltage margins.

Quiescent Current: LP3853ES-2.5/NOPB and LP3856ES-2.5/NOPB feature lower quiescent current of 4 mA, versus 5 mA for the LP3876ES-2.5/NOPB. LP3873ES-2.5/NOPB, LP3963ES-2.5/NOPB, and LP3966ES-2.5/NOPB draw 9 mA quiescent current.

PSRR Performance: LP3853ES-2.5/NOPB, LP3856ES-2.5/NOPB, LP3873ES-2.5/NOPB, and LP3853ES-2.5 specify PSRR of 73dB to 57dB at 120Hz. The main part and LP3963ES-2.5/NOPB and LP3966ES-2.5/NOPB do not provide PSRR specifications.

Frequently Asked Questions (FAQ)

Q: Can LP3853ES-2.5/NOPB directly replace LP3876ES-2.5/NOPB in existing designs?

A: Yes. Both parts deliver 2.5V at 3A in identical TO-263 (DDPAK-5) packages with matching pin configurations. The LP3853ES-2.5/NOPB offers superior performance with lower dropout voltage (0.6V vs. 1.2V) and reduced quiescent current (4 mA vs. 5 mA). No circuit modifications are required.

Q: What is the difference between LP3853ES-2.5/NOPB and LP3853ES-2.5?

A: Both parts are functionally equivalent with identical electrical specifications. LP3853ES-2.5/NOPB is in Active product status with ROHS3 compliance confirmed. LP3853ES-2.5 carries Last Time Buy status and REACH Affected designation, indicating it is being phased out. New designs should use LP3853ES-2.5/NOPB.

Q: Are National Semiconductor parts (LP3856ES-2.5/NOPB, LP3873ES-2.5/NOPB) compatible with Texas Instruments parts?

A: Yes. All substitute parts meet the same electrical and mechanical specifications for 2.5V, 3A output in TO-263 packages. National Semiconductor and Texas Instruments parts are pin-compatible and functionally interchangeable. Verify RoHS and compliance documentation for your specific application requirements.

Q: Which substitute offers the best efficiency?

A: LP3853ES-2.5/NOPB, LP3856ES-2.5/NOPB, and LP3853ES-2.5 provide the lowest dropout voltage at 0.6V compared to 1.2V for other options. Lower dropout voltage reduces power dissipation and improves overall system efficiency, particularly in applications with limited input-to-output voltage headroom.

Q: Can I use LP3963ES-2.5/NOPB or LP3966ES-2.5/NOPB as substitutes?

A: Yes. Both parts are fully compatible with identical output voltage, current, and package specifications. However, they feature higher quiescent current (9 mA vs. 5 mA) and lack published PSRR specifications. Use these parts when supply constraints require it, but prioritize LP3853ES-2.5/NOPB or LP3856ES-2.5/NOPB for new designs.

Q: What packaging options are available?

A: All substitute parts use the TO-263 (DDPAK-5) surface mount package with identical pinout and thermal characteristics. This ensures direct PCB compatibility without layout modifications.

Q: Are all substitute parts ROHS3 compliant?

A: LP3853ES-2.5/NOPB, LP3963ES-2.5/NOPB, LP3966ES-2.5/NOPB, and LP3853ES-2.5 are confirmed ROHS3 compliant. LP3856ES-2.5/NOPB and LP3873ES-2.5/NOPB do not specify RoHS status in available documentation. Verify compliance requirements with your procurement team before selection.

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