LP3876ESX-1.8 Linear Voltage Regulator — Equivalent & Substitute Parts

Part Overview

The LP3876ESX-1.8 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive 1.8V output at 3A maximum current in a TO-263 (DDPAK-5) surface mount package. The main part number LP3876ESX-1.8 carries an Obsolete product status, making identification of active equivalent and substitute parts essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Output Voltage (Fixed)	1.8V
Output Current	3A
Input Voltage (Max)	7V
Voltage Dropout (Max)	1.2V @ 3A
Quiescent Current (Iq)	5 mA
Supply Current (Max)	15 mA
Output Configuration	Positive Fixed
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature Range	-40°C to 125°C
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Mounting Type	Surface Mount
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the LP3876ESX-1.8 is determined by strict equivalence across the following critical parameters:

Output voltage: 1.8V fixed
Output current capability: 3A
Input voltage maximum: 7V
Package type: TO-263 (DDPAK-5)
Output configuration: Positive fixed
Control features: Enable function
Protection features: Over Current, Over Temperature, Short Circuit
Operating temperature range: -40°C to 125°C
Mounting type: Surface Mount

Substitute parts are grouped into two categories:

Direct Equivalents (Identical Specifications): Parts with matching voltage dropout, quiescent current, and supply current specifications.

Parametric Equivalents (Functional Compatibility): Parts with variations in dropout voltage, quiescent current, or supply current that remain within acceptable operating margins while maintaining the same output voltage, current rating, package, and protection features.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Voltage	Output Current	Input Voltage (Max)	Dropout (Max)	Iq (mA)	Supply Current (Max)	Package	RoHS Status
LP3876ESX-1.8	Texas Instruments	Obsolete	1.8V	3A	7V	1.2V @ 3A	5	15	TO-263 (DDPAK-5)	Non-compliant
LP3876ESX-1.8/NOPB	Texas Instruments	Active	1.8V	3A	7V	1.2V @ 3A	5	15	TO-263 (DDPAK-5)	ROHS3 Compliant
LP3853ESX-1.8/NOPB	Texas Instruments	Active	1.8V	3A	7V	0.6V @ 3A	4	10	TO-263 (DDPAK-5)	ROHS3 Compliant
LP3856ESX-1.8/NOPB	Texas Instruments	Active	1.8V	3A	7V	0.6V @ 3A	4	10	TO-263 (DDPAK-5)	ROHS3 Compliant
LP3873ESX-1.8/NOPB	National Semiconductor	Active	1.8V	3A	7V	1.2V @ 3A	9	15	TO-263 (DDPAK-5)	Not specified
LP3966ESX-1.8	Texas Instruments	Last Time Buy	1.8V	3A	7V	1.2V @ 3A	9	15	TO-263 (DDPAK-5)	ROHS3 Compliant
LP3966ESX-1.8/NOPB	Texas Instruments	Active	1.8V	3A	7V	1.2V @ 3A	9	15	TO-263 (DDPAK-5)	ROHS3 Compliant

Engineering Selection Recommendations

Preferred Primary Substitute: LP3876ESX-1.8/NOPB

This part is the direct equivalent of the obsolete LP3876ESX-1.8, with identical electrical specifications and the same TO-263 (DDPAK-5) package. The /NOPB variant carries ROHS3 compliance and Active product status, making it the recommended replacement for new designs and ongoing production.

Secondary Substitutes with Improved Performance: LP3853ESX-1.8/NOPB and LP3856ESX-1.8/NOPB

Both parts maintain the 1.8V output, 3A current rating, and TO-263 package. They offer reduced voltage dropout (0.6V vs. 1.2V), lower quiescent current (4 mA vs. 5 mA), and lower supply current (10 mA vs. 15 mA). These improvements reduce power dissipation and heat generation. Both carry ROHS3 compliance and Active status.

Alternative Substitutes: LP3966ESX-1.8/NOPB and LP3873ESX-1.8/NOPB

LP3966ESX-1.8/NOPB maintains identical electrical specifications to the original part with ROHS3 compliance and Active status. LP3873ESX-1.8/NOPB, manufactured by National Semiconductor, provides functional equivalence with the same output voltage, current, and package, though quiescent current is elevated at 9 mA.

Avoid: LP3966ESX-1.8 (Last Time Buy status indicates limited future availability) and the original LP3876ESX-1.8 (Obsolete status).

Frequently Asked Questions (FAQ)

Q: Can LP3853ESX-1.8/NOPB or LP3856ESX-1.8/NOPB be used as direct replacements for LP3876ESX-1.8?

A: Yes. Both parts deliver the same 1.8V output at 3A in the identical TO-263 (DDPAK-5) package with matching control and protection features. The reduced dropout voltage and quiescent current represent performance improvements rather than compatibility issues. PCB layout and thermal management remain unchanged.

Q: What is the difference between LP3876ESX-1.8 and LP3876ESX-1.8/NOPB?

A: The /NOPB suffix indicates "No Lead (Pb)" — the part is RoHS3 compliant and lead-free. Electrical specifications are identical. The main part LP3876ESX-1.8 is RoHS non-compliant and Obsolete; LP3876ESX-1.8/NOPB is Active and recommended for new designs.

Q: Why is LP3873ESX-1.8/NOPB listed as a substitute if it has higher quiescent current?

A: LP3873ESX-1.8/NOPB maintains all critical functional parameters: 1.8V output, 3A current, 7V input maximum, TO-263 package, and identical protection features. The 9 mA quiescent current (vs. 5 mA original) increases standby power consumption but does not affect load regulation or output voltage accuracy. It remains a valid functional equivalent.

Q: Are all substitute parts available in the same packaging options?

A: All listed substitutes use the TO-263 (DDPAK-5) surface mount package. Packaging variants (Tape & Reel, Bulk) differ by supplier and availability but do not affect electrical performance or PCB compatibility.

Q: Can LP3966ESX-1.8 be used in new production designs?

A: LP3966ESX-1.8 carries Last Time Buy status, indicating limited future availability. For new designs, use LP3966ESX-1.8/NOPB (Active status) or LP3876ESX-1.8/NOPB instead.

Q: What compliance certifications apply to these parts?

A: LP3876ESX-1.8/NOPB, LP3853ESX-1.8/NOPB, LP3856ESX-1.8/NOPB, LP3966ESX-1.8, and LP3966ESX-1.8/NOPB are ROHS3 compliant. All listed parts are REACH Unaffected or REACH Affected (LP3853ESX-1.8/NOPB only) and carry ECCN EAR99 classification. MSL rating is 3 (168 Hours) for all parts with specified moisture sensitivity.

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