LP3874EMPX-3.3 Equivalent & Substitute Parts

Part Overview

The LP3874EMPX-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 LP3874EMPX-3.3 carries an obsolete product status, making identification of active equivalent parts essential for ongoing design support and procurement.

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
Output Configuration	Positive Fixed
Package Type	SOT-223-5 (TO-261-5, TO-261AB)
Mounting Type	Surface Mount
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitute parts for the LP3874EMPX-3.3 are classified based on strict electrical and mechanical parameter matching:

Direct Substitution Criteria:

Output voltage: 3.3V (fixed)
Output current: 800mA
Input voltage maximum: 7V
Voltage dropout: 0.35V @ 800mA
Package: SOT-223-5
Mounting: Surface Mount
Operating temperature: -40°C to 125°C
Protection features: Over Current, Over Temperature, Short Circuit
Control features: Enable function

Parametric Equivalents: Parts meeting all electrical specifications above qualify as parametric equivalents. Variations in quiescent current (Iq) and PSRR specifications do not disqualify substitution when all primary electrical and mechanical parameters align.

Parameter Comparison

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

Engineering Selection Recommendations

Primary Recommendation: LP3874EMPX-3.3/NOPB This part is the direct equivalent of the obsolete LP3874EMPX-3.3, maintaining identical electrical specifications and quiescent current characteristics. It carries Active product status and ROHS3 compliance, making it the preferred choice for new designs and replacements.

Secondary Recommendations: LP3871EMP-3.3/NOPB and LP3871EMPX-3.3/NOPB These LP3871-series parts meet all primary electrical and mechanical parameters. They feature reduced quiescent current (5mA versus 9mA), which may provide power efficiency benefits in battery-powered or low-power applications. Both carry Active status and ROHS3 compliance.

Alternative Options: LP3874EMP-3.3/NOPB, LP3961EMP-3.3/NOPB, LP3964EMP-3.3/NOPB All three parts maintain full electrical equivalence with identical output voltage, current, dropout voltage, and quiescent current specifications. All carry Active product status and ROHS3 compliance. Selection among these options may be driven by packaging format availability (Tape & Reel versus Cut Tape & Digi-Reel) and inventory considerations.

Compliance Consideration: The original LP3874EMPX-3.3 is RoHS non-compliant. All substitute parts listed are ROHS3 compliant, meeting current regulatory requirements for new designs and procurement.

Frequently Asked Questions (FAQ)

Q: Can LP3871EMP-3.3/NOPB replace LP3874EMPX-3.3 in my design? A: Yes. Both parts deliver 3.3V at 800mA with identical voltage dropout specifications and SOT-223-5 packaging. The LP3871 variant features lower quiescent current (5mA versus 9mA), which does not affect substitution compatibility.

Q: What is the difference between LP3874EMPX-3.3/NOPB and LP3874EMP-3.3/NOPB? A: Both parts are electrically identical with matching output voltage, current, and dropout specifications. The primary difference is packaging format: LP3874EMPX-3.3/NOPB is supplied in Tape & Reel format, while LP3874EMP-3.3/NOPB is supplied in Cut Tape & Digi-Reel format.

Q: Why is the original LP3874EMPX-3.3 marked as obsolete? A: The original part carries obsolete product status. Active equivalents with improved compliance certifications (ROHS3) are available from Texas Instruments and are recommended for all new designs and procurement.

Q: Are all substitute parts in the same SOT-223-5 package? A: Yes. All substitute parts listed use the SOT-223-5 package (TO-261-5, TO-261AB), ensuring mechanical and electrical compatibility with existing PCB layouts.

Q: Which substitute part offers the best power efficiency? A: LP3871EMP-3.3/NOPB and LP3871EMPX-3.3/NOPB feature the lowest quiescent current at 5mA, compared to 9mA for other variants. This may provide measurable power savings in applications where the regulator operates continuously at light loads.

Q: Are all substitute parts RoHS compliant? A: Yes. All substitute parts carry ROHS3 compliance status. The original LP3874EMPX-3.3 is RoHS non-compliant, making the compliant substitutes necessary for designs meeting current regulatory standards.

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