LP3873ES-1.8 Equivalent & Substitute Parts

Part Overview

The LP3873ES-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 in a TO-263 (DDPAK-5) surface mount package. The main part number LP3873ES-1.8 is currently obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. Active alternatives with identical or improved electrical characteristics are available from the same manufacturer.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.8V
Output Current	3A
Input Voltage (Max)	7V
Voltage Dropout (Max)	1.2V @ 3A (main part)
Quiescent Current (Iq)	9 mA (main part)
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

Substitution for the LP3873ES-1.8 is determined by the following critical parameters:

Fixed output voltage of 1.8V
Output current capability of 3A
Maximum input voltage of 7V
TO-263 (DDPAK-5) package compatibility
Surface mount configuration
Operating temperature range of -40°C to 125°C
Enable control feature and integrated protection (Over Current, Over Temperature, Short Circuit)

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalent: LP3873ES-1.8/NOPB is the direct equivalent with identical electrical specifications and active product status.

Parametric Equivalents: LP3853ES-1.8/NOPB, LP3856ES-1.8/NOPB, LP3876ES-1.8/NOPB, and LP3966ES-1.8/NOPB meet the core functional requirements (1.8V output, 3A current, 7V input max, TO-263 package) with variations in dropout voltage, quiescent current, and PSRR specifications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage @ 3A	Quiescent Current (Iq)	Package	RoHS Status
LP3873ES-1.8	Texas Instruments	Obsolete	1.8V	3A	7V	1.2V	9 mA	TO-263 (DDPAK-5)	RoHS Non-Compliant
LP3873ES-1.8/NOPB	Texas Instruments	Active	1.8V	3A	7V	1.2V	9 mA	TO-263 (DDPAK-5)	ROHS3 Compliant
LP3853ES-1.8/NOPB	Texas Instruments	Active	1.8V	3A	7V	0.6V	4 mA	TO-263 (DDPAK-5)	ROHS3 Compliant
LP3856ES-1.8/NOPB	Texas Instruments	Active	1.8V	3A	7V	0.6V	4 mA	TO-263 (DDPAK-5)	ROHS3 Compliant
LP3876ES-1.8/NOPB	Texas Instruments	Active	1.8V	3A	7V	1.2V	5 mA	TO-263 (DDPAK-5)	ROHS3 Compliant
LP3966ES-1.8/NOPB	Texas Instruments	Active	1.8V	3A	7V	1.2V	9 mA	TO-263 (DDPAK-5)	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement: LP3873ES-1.8/NOPB is the primary choice, offering identical electrical specifications to the obsolete main part with active product status and ROHS3 compliance.

For Improved Performance: LP3853ES-1.8/NOPB and LP3856ES-1.8/NOPB provide reduced dropout voltage (0.6V versus 1.2V) and lower quiescent current (4 mA versus 9 mA), resulting in improved thermal efficiency and reduced power dissipation in applications where these characteristics are beneficial.

For Balanced Characteristics: LP3876ES-1.8/NOPB maintains the 1.2V dropout voltage specification while reducing quiescent current to 5 mA, offering a middle ground between the original specification and the lower-dropout alternatives.

For Specification Matching: LP3966ES-1.8/NOPB matches the original LP3873ES-1.8 electrical specifications (1.2V dropout, 9 mA quiescent current) with active product status and ROHS3 compliance.

All substitute parts are ROHS3 compliant, REACH unaffected, and maintain the same TO-263 (DDPAK-5) package footprint and pinout compatibility.

Frequently Asked Questions (FAQ)

Q: Can LP3853ES-1.8/NOPB or LP3856ES-1.8/NOPB be used as direct replacements for LP3873ES-1.8?

A: Yes. Both parts meet the core functional requirements (1.8V output, 3A current, 7V input maximum, TO-263 package). The reduced dropout voltage (0.6V versus 1.2V) and lower quiescent current (4 mA versus 9 mA) are improvements that do not compromise compatibility. PCB layout and thermal design remain unchanged.

Q: What is the difference between LP3873ES-1.8/NOPB and LP3966ES-1.8/NOPB?

A: Both parts have identical electrical specifications (1.2V dropout voltage, 9 mA quiescent current, 1.8V output, 3A current). The primary difference is the base product number (LP3873 versus LP3966). Both are active, ROHS3 compliant, and functionally equivalent.

Q: Are all substitute parts in the same package?

A: Yes. All listed substitute parts use the TO-263 (DDPAK-5) surface mount package with identical pinout and footprint compatibility.

Q: Which substitute part should be selected for lowest power consumption?

A: LP3853ES-1.8/NOPB and LP3856ES-1.8/NOPB both offer the lowest quiescent current at 4 mA, compared to 9 mA in the original part. These are preferred for battery-powered or low-power applications.

Q: Are there compliance differences between the substitute parts?

A: All substitute parts are ROHS3 compliant and REACH unaffected. The original LP3873ES-1.8 is RoHS non-compliant. For applications requiring RoHS compliance, any of the listed substitutes are suitable.

Q: Can these parts be used interchangeably on the same PCB?

A: Yes. All substitute parts share identical pinout, package footprint, and functional characteristics (1.8V output, 3A current, 7V input maximum, Enable control, and integrated protection). No PCB modifications are required.

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