LP3872EMP-5.0 Equivalent & Substitute Parts

Part Overview

The LP3872EMP-5.0 is a linear voltage regulator IC from Texas Instruments, delivering positive fixed 5V output at 1.5A in a SOT-223-5 surface mount package. This part is classified as Not For New Designs, indicating it has been superseded in the manufacturer's product roadmap. Finding equivalent substitute parts is necessary for ongoing production support, maintenance applications, and legacy system repairs where this regulator remains in active use.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP3872EMP-5.0
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	5V
Output Current	1.5A
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.55V @ 1.5A
Package / Case	TO-261-5, TO-261AB
Supplier Device Package	SOT-223-5
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitute parts for the LP3872EMP-5.0 are qualified based on the following critical parameters that must match or be compatible:

Fixed output voltage of 5V
Output current capability of 1.5A
Maximum input voltage of 7V
SOT-223-5 package / TO-261-5 case compatibility
Surface mount mounting type
Operating temperature range of -40°C to 125°C
Positive output configuration with fixed output type
Enable control feature and protection features (Over Current, Over Temperature, Short Circuit)

The substitute parts identified fall into two functional groups: active production parts with improved specifications (LP3852EMP-5.0/NOPB, LP3855EMP-5.0/NOPB, LP3855EMPX-5.0/NOPB, LP3875EMP-5.0/NOPB) and the direct part number variant (LP3872EMP-5.0/NOPB).

Parameter Comparison

Parameter	LP3872EMP-5.0	LP3852EMP-5.0/NOPB	LP3855EMP-5.0/NOPB	LP3855EMPX-5.0/NOPB	LP3872EMP-5.0/NOPB	LP3875EMP-5.0/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	National Semiconductor	Texas Instruments
Output Voltage	5V	5V	5V	5V	5V	5V
Output Current	1.5A	1.5A	1.5A	1.5A	1.5A	1.5A
Input Voltage (Max)	7V	7V	7V	7V	7V	7V
Voltage Dropout (Max)	0.55V @ 1.5A	0.44V @ 1.5A	0.44V @ 1.5A	0.44V @ 1.5A	0.55V @ 1.5A	0.55V @ 1.5A
Quiescent Current (Iq)	5 mA	3 mA	3 mA	3 mA	5 mA	5 mA
Supply Current (Max)	15 mA	10 mA	10 mA	10 mA	15 mA	15 mA
PSRR	73dB ~ 57dB (120Hz)	73dB ~ 57dB (120Hz)	73dB ~ 57dB (120Hz)	73dB ~ 57dB (120Hz)	73dB ~ 57dB (120Hz)	73dB ~ 57dB (120Hz)
Package / Case	TO-261-5, TO-261AB	TO-261-5, TO-261AB	TO-261-5, TO-261AB	TO-261-5, TO-261AB	TO-261-5, TO-261AB	TO-261-5, TO-261AB
Supplier Device Package	SOT-223-5	SOT-223-5	SOT-223-5	SOT-223-5	SOT-223	SOT-223-5
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
Product Status	Not For New Designs	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

For applications currently using LP3872EMP-5.0, the following selection criteria apply based on product status and compliance requirements:

Primary Substitutes (Active Production, ROHS3 Compliant): LP3852EMP-5.0/NOPB, LP3855EMP-5.0/NOPB, and LP3875EMP-5.0/NOPB are all active production parts with ROHS3 compliance. LP3852EMP-5.0/NOPB and LP3855EMP-5.0/NOPB offer improved performance with lower dropout voltage (0.44V vs 0.55V) and reduced quiescent current (3 mA vs 5 mA). LP3875EMP-5.0/NOPB maintains identical electrical characteristics to the original LP3872EMP-5.0 while offering active production status and ROHS3 compliance.

Secondary Substitute (Active Production, Packaging Variant): LP3855EMPX-5.0/NOPB is an active production variant of LP3855EMP-5.0/NOPB with identical electrical specifications and ROHS3 compliance, differing only in packaging designation.

Direct Part Number Variant: LP3872EMP-5.0/NOPB is the direct equivalent with NOPB (No Plumbum/Lead-Free) designation, maintaining identical electrical characteristics and package specifications.

For new production designs or systems requiring regulatory compliance, LP3852EMP-5.0/NOPB or LP3855EMP-5.0/NOPB are preferred due to active status and improved efficiency metrics. For direct replacement in existing designs, LP3875EMP-5.0/NOPB or LP3872EMP-5.0/NOPB maintain full compatibility.

Frequently Asked Questions (FAQ)

Q: Can LP3852EMP-5.0/NOPB directly replace LP3872EMP-5.0 in existing designs?

A: Yes. Both parts share identical output voltage (5V), output current (1.5A), input voltage rating (7V max), SOT-223-5 package, and operating temperature range (-40°C to 125°C). LP3852EMP-5.0/NOPB offers improved performance with lower dropout voltage and reduced quiescent current, making it a superior direct replacement.

Q: What is the difference between LP3855EMP-5.0/NOPB and LP3855EMPX-5.0/NOPB?

A: Both parts are functionally identical with matching electrical specifications. The difference is in the packaging designation code (EMP vs EMPX). Both are active production parts with ROHS3 compliance and can be used interchangeably in circuit designs.

Q: Is the LP3872EMP-5.0/NOPB variant different from the original LP3872EMP-5.0?

A: The LP3872EMP-5.0/NOPB is the lead-free (NOPB) version of the original part, maintaining identical electrical and mechanical specifications. The NOPB designation indicates compliance with lead-free manufacturing standards.

Q: Why do some substitutes have lower dropout voltage?

A: LP3852EMP-5.0/NOPB and LP3855EMP-5.0/NOPB feature 0.44V dropout voltage compared to 0.55V in the original LP3872EMP-5.0. This represents improved IC design in newer production variants, resulting in better efficiency and reduced heat dissipation at full load conditions.

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

A: All substitute parts use SOT-223-5 or compatible SOT-223 packaging with TO-261-5 or TO-261AB case designations, ensuring PCB footprint compatibility. Verify specific packaging availability with your supplier for the selected part number.

Q: Which substitute should I choose for RoHS-compliant applications?

A: LP3852EMP-5.0/NOPB, LP3855EMP-5.0/NOPB, LP3855EMPX-5.0/NOPB, and LP3875EMP-5.0/NOPB all carry ROHS3 compliance certification. The original LP3872EMP-5.0 is RoHS non-compliant. Select based on your performance requirements and active production status preference.

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