LP3872ES-1.8 Equivalent & Substitute Parts

Part Overview

The LP3872ES-1.8 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed 1.8V output at 1.5A in a TO-263 (DDPAK-5) surface mount package. The main part carries a "Not For New Designs" status, making identification of active equivalent and substitute parts essential for ongoing production and design updates. Substitute parts must maintain electrical compatibility across output voltage, current capacity, dropout voltage, and thermal performance while meeting modern RoHS compliance requirements.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Output Voltage (Fixed)	1.8V
Output Current	1.5A
Input Voltage (Max)	7V
Dropout Voltage (Max)	0.55V @ 1.5A or 0.38V @ 1.5A
Quiescent Current (Iq)	3 mA to 9 mA
Package	TO-263-6 (DDPAK-5)
Operating Temperature	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict parameter matching across the following criteria:

Primary Compatibility Requirements:

Fixed output voltage of 1.8V
Output current rating of 1.5A minimum
Maximum input voltage of 7V or greater
TO-263 (DDPAK-5) package compatibility
Operating temperature range of -40°C to 125°C
Enable control feature
Over Current, Over Temperature, and Short Circuit protection

Secondary Compatibility Factors:

Dropout voltage (0.38V or 0.55V @ 1.5A) — lower values indicate improved efficiency
Quiescent current (3 mA, 5 mA, or 9 mA) — lower values reduce standby power consumption
RoHS compliance status — modern designs require ROHS3 compliance
Product status — Active status preferred over obsolete or Not For New Designs

All substitute parts listed maintain the primary compatibility requirements. Variations in dropout voltage and quiescent current represent parametric trade-offs within the allowed electrical specification range.

Parameter Comparison

Part Number	Product Status	Output Voltage	Output Current	Dropout Voltage @ 1.5A	Quiescent Current	RoHS Status	Inventory (Pcs)
LP3872ES-1.8	Not For New Designs	1.8V	1.5A	0.55V	5 mA	RoHS non-compliant	5350
LP3872ES-1.8/NOPB	Active	1.8V	1.5A	0.55V	5 mA	ROHS3 Compliant	1115
LP3852ES-1.8/NOPB	Active	1.8V	1.5A	0.38V	3 mA	ROHS3 Compliant	913
LP3855ES-1.8/NOPB	Active	1.8V	1.5A	0.38V	3 mA	ROHS3 Compliant	1066
LP3875ES-1.8/NOPB	Active	1.8V	1.5A	0.55V	5 mA	ROHS3 Compliant	961
LP3962ES-1.8/NOPB	Active	1.8V	1.5A	0.55V	9 mA	ROHS3 Compliant	1212
LP3965ES-1.8/NOPB	Active	1.8V	1.5A	0.55V	9 mA	ROHS3 Compliant	864

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility): LP3872ES-1.8/NOPB is the direct equivalent of LP3872ES-1.8, offering identical electrical performance with the addition of ROHS3 compliance and Active product status. This part is recommended for designs requiring no performance changes while meeting modern regulatory requirements.

Improved Performance Alternatives: LP3852ES-1.8/NOPB and LP3855ES-1.8/NOPB provide superior efficiency characteristics with reduced dropout voltage (0.38V vs. 0.55V) and lower quiescent current (3 mA vs. 5 mA). These parts are suitable for applications where power efficiency and thermal management are priorities. Both maintain Active status and ROHS3 compliance.

Equivalent Performance with Active Status: LP3875ES-1.8/NOPB matches the electrical performance of the original LP3872ES-1.8 while providing Active product status and ROHS3 compliance. This part serves as a direct functional equivalent for designs not requiring the improved efficiency of the LP3852/LP3855 series.

Higher Quiescent Current Alternatives: LP3962ES-1.8/NOPB and LP3965ES-1.8/NOPB maintain all primary compatibility requirements but operate with elevated quiescent current (9 mA). These parts are acceptable only in applications where standby power consumption is not a design constraint.

All substitute parts are certified ROHS3 compliant and carry Active product status, making them suitable for new designs and ongoing production.

Frequently Asked Questions (FAQ)

Q: Can LP3852ES-1.8/NOPB or LP3855ES-1.8/NOPB be used as direct replacements for LP3872ES-1.8? A: Yes. Both parts maintain the required 1.8V output, 1.5A current capacity, and TO-263 package. They offer improved efficiency with lower dropout voltage (0.38V) and quiescent current (3 mA), making them superior alternatives for new designs.

Q: What is the difference between LP3872ES-1.8 and LP3872ES-1.8/NOPB? A: The /NOPB suffix indicates lead-free solder compatibility and RoHS3 compliance. LP3872ES-1.8/NOPB is the modern equivalent with Active product status, while the original LP3872ES-1.8 is marked "Not For New Designs" and is RoHS non-compliant.

Q: Are LP3962ES-1.8/NOPB and LP3965ES-1.8/NOPB suitable replacements? A: These parts meet all primary electrical and package requirements. However, their higher quiescent current (9 mA vs. 5 mA) results in increased standby power consumption. Use only if power efficiency is not a design constraint.

Q: Do all substitute parts use the same TO-263 package? A: Yes. All listed parts use the TO-263-6 (DDPAK-5) package, ensuring mechanical and thermal compatibility without PCB redesign.

Q: Which substitute part offers the best efficiency? A: LP3852ES-1.8/NOPB and LP3855ES-1.8/NOPB both provide the lowest dropout voltage (0.38V @ 1.5A) and quiescent current (3 mA), resulting in superior power efficiency compared to other alternatives.

Q: Are all substitute parts RoHS compliant? A: Yes. All substitute parts carry ROHS3 compliance. The original LP3872ES-1.8 is RoHS non-compliant and should be replaced in new designs.

Q: What is the operating temperature range for all parts? A: All parts operate across -40°C to 125°C, maintaining consistent thermal performance across the product family.

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