LP3871EMP-3.3 Equivalent & Substitute Parts

Part Overview

The LP3871EMP-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 with a maximum dropout voltage of 0.35V, housed in a SOT-223-5 surface mount package. The main part number LP3871EMP-3.3 carries an obsolete product status, making identification of active equivalent alternatives essential for ongoing design support and procurement continuity.

Substiute Parts

LP3871EMP-3.3

Texas InstrumentsIn Stock: 2302LP3871EMP-3.3 Datasheet

Current PartRFQ

LP3871EMP-3.3/NOPB

Texas InstrumentsIn Stock: 1116LP3871EMP-3.3/NOPB Datasheet

DirectRFQ

LP3871EMPX-3.3/NOPB

Texas InstrumentsIn Stock: 1297LP3871EMPX-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP3874EMP-3.3/NOPB

Texas InstrumentsIn Stock: 3433LP3874EMP-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP3874EMPX-3.3/NOPB

Texas InstrumentsIn Stock: 2053LP3874EMPX-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP3961EMP-3.3/NOPB

Texas InstrumentsIn Stock: 51510LP3961EMP-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP3964EMP-3.3/NOPB

Texas InstrumentsIn Stock: 3331LP3964EMP-3.3/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LP3871EMP-3.3 is determined by strict parameter matching across the following critical criteria:

Core Electrical Parameters (Must Match):

• Output voltage: 3.3V fixed
• Output current capability: 800mA
• Input voltage maximum: 7V
• Dropout voltage: 0.35V @ 800mA
• Output configuration: Positive
• Output type: Fixed
• Number of regulators: 1

Mechanical & Environmental Parameters (Must Match):

• Package type: SOT-223-5
• Mounting type: Surface Mount
• Operating temperature range: -40°C ~ 125°C
• Protection features: Over Current, Over Temperature, Short Circuit
• Control features: Enable

Acceptable Variations:

• Quiescent current (Iq): 5mA or 9mA
• PSRR specification: Present or not specified
• Packaging format: Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel®
• Product status: Active variants preferred over obsolete
• RoHS compliance: ROHS3 Compliant preferred

All substitute parts listed maintain identical electrical performance and mechanical compatibility with the original LP3871EMP-3.3 specification.

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility): LP3871EMP-3.3/NOPB and LP3871EMPX-3.3/NOPB maintain identical electrical specifications to the original part, including the 5mA quiescent current. Both are active products with ROHS3 compliance. LP3871EMP-3.3/NOPB is available in Tape & Reel format with 1105 units in stock, while LP3871EMPX-3.3/NOPB offers 1222 units in the same packaging format.

Parametric Equivalents (Acceptable Substitutes): LP3874EMP-3.3/NOPB, LP3874EMPX-3.3/NOPB, LP3961EMP-3.3/NOPB, and LP3964EMP-3.3/NOPB are parametric equivalents with identical electrical performance except for quiescent current specification of 9mA versus the original 5mA. All four are active products with ROHS3 compliance. LP3961EMP-3.3/NOPB offers the highest inventory availability at 51498 units.

Compliance Considerations: The original LP3871EMP-3.3 is RoHS non-compliant and carries obsolete status. All substitute parts listed are ROHS3 compliant and active products, providing improved regulatory alignment and long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can LP3874EMP-3.3/NOPB replace LP3871EMP-3.3 in my design? A: Yes. LP3874EMP-3.3/NOPB is a parametric equivalent with identical output voltage (3.3V), output current (800mA), dropout voltage (0.35V @ 800mA), and package type (SOT-223-5). The quiescent current is 9mA versus 5mA in the original, which is acceptable for most applications. Verify power budget impact in your specific circuit.

Q: What is the difference between LP3871EMP-3.3/NOPB and LP3871EMPX-3.3/NOPB? A: Both parts are electrically identical with 3.3V output, 800mA current, and 5mA quiescent current. The difference is in the packaging format designation (NOPB versus EMPX), but both are supplied in Tape & Reel format. Consult the datasheet for any minor process or marking variations.

Q: Why do some substitute parts have 9mA quiescent current instead of 5mA? A: LP3874, LP3961, and LP3964 series variants have a higher quiescent current specification of 9mA. This represents a 4mA increase in standby power consumption. For battery-powered or low-power applications, this difference may be significant; for line-powered designs, the impact is typically negligible.

Q: Are all substitute parts RoHS compliant? A: Yes. All substitute parts listed (LP3871EMP-3.3/NOPB, LP3871EMPX-3.3/NOPB, LP3874EMP-3.3/NOPB, LP3874EMPX-3.3/NOPB, LP3961EMP-3.3/NOPB, and LP3964EMP-3.3/NOPB) are ROHS3 compliant. The original LP3871EMP-3.3 is RoHS non-compliant.

Q: What packaging formats are available for these substitute parts? A: Substitute parts are available in two packaging formats: Tape & Reel (TR) for LP3871EMP-3.3/NOPB, LP3871EMPX-3.3/NOPB, and LP3874EMPX-3.3/NOPB; and Cut Tape (CT) & Digi-Reel® for LP3874EMP-3.3/NOPB, LP3961EMP-3.3/NOPB, and LP3964EMP-3.3/NOPB. Select based on your procurement and assembly requirements.

Q: Which substitute part has the best inventory availability? A: LP3961EMP-3.3/NOPB offers the highest inventory with 51498 units in stock, followed by LP3874EMP-3.3/NOPB with 3400 units. Both are active products with full ROHS3 compliance.

Q: Can I use these parts interchangeably on the same PCB? A: Yes. All substitute parts share the identical SOT-223-5 package footprint and pinout, enabling direct PCB compatibility. Electrical performance is equivalent within the specified parameter ranges.