LP3872EMP-3.3 Equivalent & Substitute Parts

Part Overview

The LP3872EMP-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output applications. This Surface Mount device delivers 1.5A output current in a SOT-223-5 package and includes integrated protection features for over-current, over-temperature, and short-circuit conditions. The main part number LP3872EMP-3.3 carries obsolete product status. Direct equivalents and parametric alternatives are available from Texas Instruments with active product status and improved compliance certifications, making substitution necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	1.5A
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.55V @ 1.5A
Quiescent Current (Iq)	5 mA
Package Type	SOT-223-5
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution eligibility for LP3872EMP-3.3 is determined by the following critical parameters:

Primary Substitution Criteria:

Output voltage: 3.3V fixed
Output current capability: 1.5A
Input voltage maximum: 7V
Package type: SOT-223-5
Mounting type: Surface Mount
Protection features: Over Current, Over Temperature, Short Circuit
Control features: Enable function

Substitution Categories:

Direct Manufacturer Equivalent: LP3872EMP-3.3/NOPB maintains identical electrical specifications to the main part with improved product status (Active) and RoHS3 compliance.

Parametric Equivalents with Improved Performance: LP3852EMP-3.3/NOPB, LP3855EMP-3.3/NOPB, LP3872EMPX-3.3/NOPB, and LP3875EMP-3.3/NOPB deliver the same 3.3V output and 1.5A current capacity. LP3852 and LP3855 variants feature reduced quiescent current (3 mA vs. 5 mA) and lower dropout voltage (0.44V vs. 0.55V), providing efficiency improvements while maintaining full functional compatibility.

Parametric Equivalents with Alternative Specifications: LP3962EMP-3.3, LP3962EMP-3.3/NOPB, and LP3965EMP-3.3/NOPB provide identical output voltage and current ratings with higher quiescent current (9 mA) and carry Last Time Buy or Active status.

All substitute parts share the same SOT-223-5 package, mounting type, operating temperature range, and core protection architecture, ensuring direct PCB compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Voltage	Output Current	Dropout Voltage (Max)	Quiescent Current	Package	RoHS Status	Inventory
LP3872EMP-3.3	Texas Instruments	Obsolete	3.3V	1.5A	0.55V @ 1.5A	5 mA	SOT-223-5	RoHS Non-Compliant	1308 Pcs
LP3872EMP-3.3/NOPB	Texas Instruments	Active	3.3V	1.5A	0.55V @ 1.5A	5 mA	SOT-223-5	ROHS3 Compliant	55342 Pcs
LP3852EMP-3.3	Texas Instruments	Last Time Buy	3.3V	1.5A	0.44V @ 1.5A	3 mA	SOT-223-5	ROHS3 Compliant	1507 Pcs
LP3852EMP-3.3/NOPB	Texas Instruments	Active	3.3V	1.5A	0.44V @ 1.5A	3 mA	SOT-223-5	ROHS3 Compliant	2200 Pcs
LP3855EMP-3.3/NOPB	Texas Instruments	Active	3.3V	1.5A	0.44V @ 1.5A	3 mA	SOT-223-5	ROHS3 Compliant	2396 Pcs
LP3872EMPX-3.3/NOPB	Texas Instruments	Active	3.3V	1.5A	0.55V @ 1.5A	5 mA	SOT-223-5	ROHS3 Compliant	2997 Pcs
LP3875EMP-3.3/NOPB	Texas Instruments	Active	3.3V	1.5A	0.55V @ 1.5A	5 mA	SOT-223-5	ROHS3 Compliant	1715 Pcs
LP3962EMP-3.3	Texas Instruments	Last Time Buy	3.3V	1.5A	0.55V @ 1.5A	9 mA	SOT-223-5	ROHS3 Compliant	1200 Pcs
LP3962EMP-3.3/NOPB	Texas Instruments	Active	3.3V	1.5A	0.55V @ 1.5A	9 mA	SOT-223-5	ROHS3 Compliant	1695 Pcs
LP3965EMP-3.3/NOPB	Texas Instruments	Active	3.3V	1.5A	0.55V @ 1.5A	9 mA	SOT-223-5	ROHS3 Compliant	1401 Pcs

Engineering Selection Recommendations

For Direct Replacement with Active Status: LP3872EMP-3.3/NOPB is the primary direct equivalent, maintaining identical electrical specifications while providing Active product status and ROHS3 compliance. This part is recommended for designs requiring no performance changes from the obsolete LP3872EMP-3.3.

For Improved Efficiency: LP3852EMP-3.3/NOPB and LP3855EMP-3.3/NOPB offer reduced quiescent current (3 mA) and lower dropout voltage (0.44V), resulting in lower power dissipation and improved thermal performance. Both carry Active status and ROHS3 compliance. LP3852EMP-3.3/NOPB is available in higher quantity (2200 Pcs).

For Matching Original Specifications with Extended Availability: LP3872EMPX-3.3/NOPB and LP3875EMP-3.3/NOPB maintain the original 5 mA quiescent current and 0.55V dropout voltage specifications with Active product status and ROHS3 compliance. Both provide robust inventory levels.

For Last Time Buy Considerations: LP3852EMP-3.3 and LP3962EMP-3.3 carry Last Time Buy status and should be evaluated only if existing inventory commitments require their use. Active alternatives with superior compliance are preferred for new designs.

All recommended substitutes maintain SOT-223-5 packaging, -40°C to 125°C operating range, and identical protection architecture, ensuring direct PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can LP3852EMP-3.3/NOPB replace LP3872EMP-3.3 directly on the PCB? A: Yes. Both parts use the SOT-223-5 package with identical pinout and mounting footprint. LP3852EMP-3.3/NOPB provides improved performance with lower quiescent current and dropout voltage while maintaining 3.3V output and 1.5A current capacity.

Q: What is the difference between LP3872EMP-3.3/NOPB and LP3872EMPX-3.3/NOPB? A: Both maintain identical electrical specifications (3.3V output, 1.5A current, 0.55V dropout, 5 mA quiescent current) and SOT-223-5 packaging. The primary difference is product status and availability. LP3872EMP-3.3/NOPB is the direct equivalent with higher inventory (55342 Pcs vs. 2997 Pcs).

Q: Why do LP3962EMP-3.3 and LP3965EMP-3.3/NOPB show higher quiescent current? A: These parts feature 9 mA quiescent current compared to 5 mA in LP3872EMP-3.3. They remain functionally compatible for 3.3V, 1.5A applications but consume more standby power. They are suitable for applications where quiescent current is not a critical design constraint.

Q: Are all substitute parts RoHS compliant? A: All substitute parts listed carry ROHS3 compliance. The original LP3872EMP-3.3 is RoHS non-compliant. For applications requiring RoHS compliance, any of the listed substitutes are acceptable.

Q: What packaging options are available for these regulators? A: All parts use SOT-223-5 package with Surface Mount mounting type. Packaging variations (Cut Tape, Digi-Reel, Tape & Reel) affect supply format but not electrical or mechanical compatibility.

Q: Can I use LP3855EMP-3.3/NOPB in a design originally specified for LP3872EMP-3.3? A: Yes. LP3855EMP-3.3/NOPB delivers the same 3.3V output and 1.5A current with improved efficiency (0.44V dropout, 3 mA quiescent current). The identical SOT-223-5 package ensures direct PCB compatibility without design modifications.

Q: Which substitute offers the best inventory availability? A: LP3872EMP-3.3/NOPB provides the highest inventory level at 55342 Pcs, making it the most readily available direct equivalent for immediate procurement needs.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message