LP3961EMP-3.3 Equivalent & Substitute Parts

Part Overview

The LP3961EMP-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 integrated protection features including over-current, over-temperature, and short-circuit protection. The main part number is currently in Last Time Buy status with 1133 pieces in stock. Due to its discontinuation trajectory, identifying equivalent substitute parts ensures design continuity and supply chain reliability for applications requiring 3.3V linear regulation in SOT-223-5 surface mount packages.

Substiute Parts

LP3961EMP-3.3

Texas InstrumentsIn Stock: 1243LP3961EMP-3.3 Datasheet

Current PartRFQ

LP3961EMP-3.3/NOPB

Texas InstrumentsIn Stock: 51510LP3961EMP-3.3/NOPB Datasheet

DirectRFQ

LP3871EMP-3.3/NOPB

Texas InstrumentsIn Stock: 1116LP3871EMP-3.3/NOPB Datasheet

Parametric EquivalentRFQ

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

LP3964EMP-3.3/NOPB

Texas InstrumentsIn Stock: 3331LP3964EMP-3.3/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP3961EMP-3.3 are classified based on strict electrical and mechanical parameter matching:

Direct Substitute (Identical Specifications):

• LP3961EMP-3.3/NOPB: Identical electrical specifications with active product status and higher inventory availability (51498 pieces).

Parametric Equivalents (Functionally Compatible): Substitute parts maintain compatibility when all of the following core parameters match:

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

Parts meeting these criteria include LP3871EMP-3.3/NOPB, LP3871EMPX-3.3/NOPB, LP3874EMP-3.3/NOPB, LP3874EMPX-3.3/NOPB, and LP3964EMP-3.3/NOPB. Secondary parameter variations (quiescent current, PSRR specifications) do not affect substitution eligibility when primary electrical and mechanical parameters are identical.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, matching the regulatory posture of the main part number LP3961EMP-3.3.

LP3961EMP-3.3/NOPB is the primary direct substitute, offering identical electrical specifications with active product status and significantly higher inventory (51498 pieces). This part is recommended for immediate design transitions from the Last Time Buy LP3961EMP-3.3.

LP3874EMP-3.3/NOPB and LP3964EMP-3.3/NOPB provide alternative active sources with comparable inventory levels (3400 and 3274 pieces respectively) and identical core electrical parameters. Both are available in Cut Tape & Digi-Reel packaging matching the original part's packaging format.

LP3871EMP-3.3/NOPB and LP3871EMPX-3.3/NOPB offer lower quiescent current (5 mA versus 9 mA) and documented PSRR specifications (73dB ~ 57dB at 120Hz), beneficial for power-sensitive applications. These parts are available in Tape & Reel packaging.

LP3874EMPX-3.3/NOPB provides the same electrical characteristics as LP3874EMP-3.3/NOPB in Tape & Reel format with 2021 pieces available.

All substitute parts are manufactured by Texas Instruments, maintain the SOT-223-5 package footprint, and support the same -40°C to 125°C operating temperature range with identical protection features.

Frequently Asked Questions (FAQ)

Q: Can LP3961EMP-3.3/NOPB directly replace LP3961EMP-3.3?

A: Yes. LP3961EMP-3.3/NOPB is the direct equivalent with identical electrical specifications, package type (SOT-223-5), and protection features. The primary difference is product status (Active versus Last Time Buy) and inventory availability.

Q: What is the difference between LP3871EMP-3.3/NOPB and LP3874EMP-3.3/NOPB?

A: Both parts deliver 3.3V at 800mA with identical dropout voltage and package specifications. LP3871EMP-3.3/NOPB has lower quiescent current (5 mA) and documented PSRR (73dB ~ 57dB at 120Hz), while LP3874EMP-3.3/NOPB has 9 mA quiescent current. LP3874EMP-3.3/NOPB offers higher inventory availability (3400 pieces).

Q: Are packaging differences between Cut Tape & Digi-Reel and Tape & Reel significant for substitution?

A: Packaging format affects supply chain handling and automated assembly processes but does not alter electrical compatibility. The SOT-223-5 package footprint remains identical across all substitute parts. Selection depends on manufacturing equipment compatibility and procurement requirements.

Q: Do all substitute parts support the same operating temperature range?

A: Yes. All substitute parts operate across -40°C to 125°C, matching the original LP3961EMP-3.3 specification.

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 5 mA compared to 9 mA in other alternatives. This reduces standby power consumption in applications where the regulator operates continuously.

Q: Are all substitute parts RoHS and REACH compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original part's regulatory certifications.