LP3965EMP-1.8 Equivalent & Substitute Parts

Part Overview

The LP3965EMP-1.8 is a linear voltage regulator IC manufactured by Texas Instruments, designed to deliver a fixed 1.8V output at 1.5A in a SOT-223-5 surface mount package. This positive fixed output regulator includes integrated over-current, over-temperature, and short-circuit protection with an enable control feature. The part is currently listed as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications requiring 1.8V regulation at 1.5A output capacity.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP3965EMP-1.8
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	1.8V
Output Current	1.5A
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.55V @ 1.5A
Quiescent Current	9 mA
Supply Current (Max)	15 mA
Package Type	SOT-223-5 (TO-261-5, TO-261AB)
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the LP3965EMP-1.8 are qualified based on the following critical parameters that must match or be compatible with the original specification:

Mandatory Matching Parameters:

Output voltage: 1.8V fixed
Output current capability: 1.5A
Maximum input voltage: 7V
Package type: SOT-223-5 (TO-261-5, TO-261AB)
Operating temperature range: -40°C to 125°C
Protection features: Over Current, Over Temperature, Short Circuit
Control features: Enable function

Allowable Variation Parameters:

Voltage dropout: May be equal to or lower than 0.55V @ 1.5A
Quiescent current: May be equal to or lower than 9 mA
Supply current: May be equal to or lower than 15 mA
PSRR: May be specified or unspecified
RoHS compliance: May differ from original
Product status: Active or Last Time Buy preferred over Obsolete

Substitute parts are grouped into two categories: direct parametric equivalents with improved performance characteristics (LP3852 series, LP3855 series, LP3872EMP-1.8/NOPB, LP3875EMP-1.8/NOPB) and functional equivalents with identical core specifications (LP3962EMP-1.8/NOPB, LP3965EMP-1.8/NOPB).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout @ 1.5A	Quiescent Current	Supply Current (Max)	Package	Operating Temp	Product Status	RoHS Status
LP3965EMP-1.8	Texas Instruments	1.8V	1.5A	7V	0.55V	9 mA	15 mA	SOT-223-5	-40°C to 125°C	Obsolete	RoHS non-compliant
LP3852EMP-1.8	Texas Instruments	1.8V	1.5A	7V	0.43V	3 mA	10 mA	SOT-223-5	-40°C to 125°C	Last Time Buy	ROHS3 Compliant
LP3852EMP-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.43V	3 mA	10 mA	SOT-223-5	-40°C to 125°C	Active	ROHS3 Compliant
LP3852EMPX-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.43V	3 mA	10 mA	SOT-223-5	-40°C to 125°C	Active	ROHS3 Compliant
LP3855EMP-1.8	Texas Instruments	1.8V	1.5A	7V	0.43V	3 mA	10 mA	SOT-223-5	-40°C to 125°C	Obsolete	RoHS non-compliant
LP3855EMP-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.43V	3 mA	10 mA	SOT-223-5	-40°C to 125°C	Active	ROHS3 Compliant
LP3872EMP-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.55V	5 mA	15 mA	SOT-223-5	-40°C to 125°C	Active	ROHS3 Compliant
LP3875EMP-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.55V	5 mA	15 mA	SOT-223-5	-40°C to 125°C	Active	ROHS3 Compliant
LP3962EMP-1.8/NOPB	National Semiconductor	1.8V	1.5A	7V	0.55V	9 mA	15 mA	SOT-223	-40°C to 125°C	Active	Not specified
LP3965EMP-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.55V	9 mA	15 mA	SOT-223-5	-40°C to 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Preferred Primary Substitute: LP3965EMP-1.8/NOPB

This part is the direct active production equivalent of the obsolete LP3965EMP-1.8. It maintains identical electrical specifications including 0.55V dropout voltage, 9 mA quiescent current, and 15 mA maximum supply current. The /NOPB suffix indicates lead-free, halogen-free construction with ROHS3 compliance. This is the recommended replacement for direct substitution without design modification.

Secondary Substitutes with Improved Performance: LP3852EMP-1.8/NOPB, LP3852EMPX-1.8/NOPB, LP3855EMP-1.8/NOPB

These parts offer superior performance characteristics with lower dropout voltage (0.43V vs. 0.55V), reduced quiescent current (3 mA vs. 9 mA), and lower supply current (10 mA vs. 15 mA). All are active production parts with ROHS3 compliance. These substitutes are suitable when improved efficiency and reduced power dissipation are beneficial to the application.

Alternative Substitutes with Matched Specifications: LP3872EMP-1.8/NOPB, LP3875EMP-1.8/NOPB

These parts maintain the same dropout voltage and supply current specifications as the original LP3965EMP-1.8 while offering reduced quiescent current (5 mA vs. 9 mA). Both are active production parts with ROHS3 compliance, providing a middle-ground option between the original specifications and the improved LP3852/LP3855 series.

Cross-Manufacturer Option: LP3962EMP-1.8/NOPB

This National Semiconductor part provides identical electrical specifications to the original LP3965EMP-1.8 (0.55V dropout, 9 mA quiescent current, 15 mA supply current) and is in active production. The package designation differs slightly (SOT-223 vs. SOT-223-5), but both are mechanically compatible TO-261-5/TO-261AB footprints. This option is suitable when Texas Instruments parts are unavailable.

Frequently Asked Questions (FAQ)

Q: Can I use LP3852EMP-1.8/NOPB as a direct replacement for LP3965EMP-1.8?

A: Yes. Both parts deliver 1.8V at 1.5A in SOT-223-5 packages with identical input voltage limits and operating temperature ranges. The LP3852EMP-1.8/NOPB offers improved performance with lower dropout voltage (0.43V vs. 0.55V) and reduced quiescent current (3 mA vs. 9 mA), making it a superior substitute. No design changes are required.

Q: What is the difference between LP3852EMP-1.8 and LP3852EMP-1.8/NOPB?

A: The /NOPB suffix indicates lead-free, halogen-free construction compliant with ROHS3 standards. Both parts have identical electrical specifications. LP3852EMP-1.8/NOPB is the active production variant and is preferred for new designs.

Q: Are LP3872EMP-1.8/NOPB and LP3875EMP-1.8/NOPB interchangeable?

A: Yes. Both parts are electrically identical with 1.8V output, 1.5A capacity, 0.55V dropout voltage, 5 mA quiescent current, and SOT-223-5 packaging. They are interchangeable in all applications.

Q: Why does LP3962EMP-1.8/NOPB list SOT-223 instead of SOT-223-5?

A: Both designations refer to the same physical package (TO-261-5/TO-261AB). The SOT-223 and SOT-223-5 nomenclature are equivalent for this component family. The part is mechanically and electrically compatible with SOT-223-5 footprints.

Q: Which substitute offers the best efficiency?

A: LP3852EMP-1.8/NOPB, LP3852EMPX-1.8/NOPB, and LP3855EMP-1.8/NOPB offer the lowest quiescent current (3 mA) and dropout voltage (0.43V), resulting in reduced power dissipation and improved efficiency compared to the original LP3965EMP-1.8.

Q: Is RoHS compliance important for my application?

A: RoHS compliance is required for products sold in the European Union and many other markets. LP3965EMP-1.8/NOPB, LP3852 series, LP3855 series, LP3872EMP-1.8/NOPB, and LP3875EMP-1.8/NOPB are all ROHS3 compliant. The original LP3965EMP-1.8 and LP3855EMP-1.8 are non-compliant and should not be used in new designs intended for regulated markets.

Q: Can I use an obsolete part variant if it is in stock?

A: Obsolete parts (LP3965EMP-1.8, LP3855EMP-1.8) should be avoided for new production. Active production equivalents (LP3965EMP-1.8/NOPB, LP3855EMP-1.8/NOPB) ensure long-term supply availability and compliance with current standards. Obsolete parts are suitable only for maintenance of existing equipment when active alternatives are unavailable.

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