LP3871EMPX-3.3 Equivalent & Substitute Parts

Part Overview

The LP3871EMPX-3.3 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed 3.3V output at 800mA in a surface-mount SOT-223-5 package. The main part number LP3871EMPX-3.3 carries an Obsolete product status, making identification of active equivalent alternatives essential for new designs and ongoing production support.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Output Voltage (Fixed)	3.3V
Output Current	800mA
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.35V @ 800mA
Package Type	SOT-223-5
Output Configuration	Positive Fixed
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature Range	-40°C to 125°C
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitute parts for the LP3871EMPX-3.3 are grouped based on strict electrical and mechanical parameter matching:

Primary Substitution Criteria:

Fixed output voltage of 3.3V
Output current rating of 800mA
Maximum input voltage of 7V
Voltage dropout of 0.35V @ 800mA
SOT-223-5 package (TO-261-5, TO-261AB case)
Surface mount configuration
Enable control feature
Over Current, Over Temperature, and Short Circuit protection

Active Equivalent Parts: All substitute parts listed below maintain identical electrical specifications and package requirements. Differences exist only in quiescent current (Iq) ratings and product status (all substitutes are Active, versus the Obsolete main part).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current (Iq)	Package	Product Status	RoHS Status
LP3871EMPX-3.3	Texas Instruments	3.3V	800mA	7V	0.35V @ 800mA	5 mA	SOT-223-5	Obsolete	RoHS Non-Compliant
LP3871EMPX-3.3/NOPB	Texas Instruments	3.3V	800mA	7V	0.35V @ 800mA	5 mA	SOT-223-5	Active	ROHS3 Compliant
LP3871EMP-3.3/NOPB	Texas Instruments	3.3V	800mA	7V	0.35V @ 800mA	5 mA	SOT-223-5	Active	ROHS3 Compliant
LP3874EMP-3.3/NOPB	Texas Instruments	3.3V	800mA	7V	0.35V @ 800mA	9 mA	SOT-223-5	Active	ROHS3 Compliant
LP3874EMPX-3.3/NOPB	Texas Instruments	3.3V	800mA	7V	0.35V @ 800mA	9 mA	SOT-223-5	Active	ROHS3 Compliant
LP3961EMP-3.3/NOPB	Texas Instruments	3.3V	800mA	7V	0.35V @ 800mA	9 mA	SOT-223-5	Active	ROHS3 Compliant
LP3964EMP-3.3/NOPB	Texas Instruments	3.3V	800mA	7V	0.35V @ 800mA	9 mA	SOT-223-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

For New Designs: Select LP3871EMPX-3.3/NOPB or LP3871EMP-3.3/NOPB as primary choices. Both maintain the original 5 mA quiescent current specification and carry Active product status with ROHS3 compliance. The /NOPB designation indicates lead-free, halogen-free construction meeting modern environmental standards.

For Designs Tolerant of Increased Quiescent Current: LP3874EMP-3.3/NOPB, LP3874EMPX-3.3/NOPB, LP3961EMP-3.3/NOPB, and LP3964EMP-3.3/NOPB are suitable alternatives. These parts increase quiescent current from 5 mA to 9 mA while maintaining all other electrical and mechanical parameters. This trade-off is acceptable in applications where standby power consumption is not a critical constraint.

Compliance Considerations: All substitute parts are ROHS3 compliant and REACH unaffected, addressing regulatory requirements for new production. The original LP3871EMPX-3.3 (Obsolete, RoHS Non-Compliant) should not be used in new designs subject to environmental compliance mandates.

Packaging and Inventory: Substitute parts are available in Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® packaging options, with inventory levels ranging from 1,105 to 51,498 units across the product line.

Frequently Asked Questions (FAQ)

Q: Can LP3874EMP-3.3/NOPB replace LP3871EMPX-3.3 directly? A: Yes. Both parts deliver 3.3V at 800mA in SOT-223-5 packages with identical dropout voltage and protection features. The LP3874EMP-3.3/NOPB has a higher quiescent current (9 mA vs. 5 mA), which increases standby power consumption but does not affect load regulation or output voltage accuracy.

Q: What is the difference between LP3871EMPX-3.3/NOPB and LP3871EMP-3.3/NOPB? A: Both parts are electrically and mechanically identical with 5 mA quiescent current and 3.3V fixed output. The primary difference is packaging: LP3871EMPX-3.3/NOPB is supplied in Tape & Reel format, while LP3871EMP-3.3/NOPB is available in Tape & Reel as well. Consult packaging specifications for exact reel configurations and quantities per reel.

Q: Why is the original LP3871EMPX-3.3 marked Obsolete? A: The original part carries Obsolete status and RoHS Non-Compliant designation. Texas Instruments has transitioned this product line to active equivalents with ROHS3 compliance and lead-free construction. New designs must use Active alternatives.

Q: Are all substitute parts pin-compatible? A: Yes. All substitute parts use the SOT-223-5 package (TO-261-5, TO-261AB case) with identical pinout and mechanical dimensions, ensuring direct PCB compatibility.

Q: Which substitute should I choose for lowest power consumption? A: LP3871EMPX-3.3/NOPB or LP3871EMP-3.3/NOPB maintain the original 5 mA quiescent current specification. The LP3874, LP3961, and LP3964 variants increase Iq to 9 mA and are suitable only if standby current is not a design constraint.

Q: Are these parts suitable for battery-powered applications? A: The 5 mA quiescent current variants (LP3871EMPX-3.3/NOPB, LP3871EMP-3.3/NOPB) are appropriate for low-power battery applications. The 9 mA variants should be evaluated based on total system standby current requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message