LP3961EMPX-5.0 Equivalent & Substitute Parts

Part Overview

The LP3961EMPX-5.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 5V output at 800mA in a SOT-223-5 surface mount package. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The device provides regulated 5V output with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for applications requiring stable low-voltage power delivery.

Substiute Parts

LP3961EMPX-5.0

Texas InstrumentsIn Stock: 5074LP3961EMPX-5.0 Datasheet

Current PartRFQ

LP3874EMP-5.0/NOPB

National SemiconductorIn Stock: 42846LP3874EMP-5.0/NOPB Datasheet

MFR RecommendedRFQ

LP3871EMP-5.0/NOPB

Texas InstrumentsIn Stock: 1456LP3871EMP-5.0/NOPB Datasheet

Parametric EquivalentRFQ

LP3874EMPX-5.0/NOPB

Texas InstrumentsIn Stock: 818LP3874EMPX-5.0/NOPB Datasheet

Parametric EquivalentRFQ

LP3961EMP-5.0/NOPB

Texas InstrumentsIn Stock: 2483LP3961EMP-5.0/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP3961EMPX-5.0 are qualified based on the following critical parameters that determine functional equivalence:

• Output voltage: 5V fixed
• Output current capability: 800mA
• Maximum input voltage: 7V
• Voltage dropout: 0.35V @ 800mA
• Package type: SOT-223-5 (TO-261-5, TO-261AB)
• Operating temperature range: -40°C to 125°C
• Protection features: Over Current, Over Temperature, Short Circuit
• Control features: Enable function
• Mounting type: Surface Mount

All substitute parts listed maintain these core electrical and mechanical specifications, ensuring pin-compatible and functionally equivalent operation in existing circuit designs.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: LP3871EMP-5.0/NOPB

The LP3871EMP-5.0/NOPB is the preferred substitute for the obsolete LP3961EMPX-5.0. This part is manufactured by Texas Instruments (original manufacturer), maintains active product status, and provides superior quiescent current performance at 5 mA compared to 9 mA in the original part. It carries ROHS3 compliance certification and is available in Tape & Reel packaging with 1,381 units in stock. The reduced quiescent current offers improved power efficiency in battery-powered or low-power applications.

Secondary Recommendation: LP3874EMPX-5.0/NOPB

The LP3874EMPX-5.0/NOPB is a parametric equivalent from Texas Instruments with active product status. It maintains identical electrical specifications including 9 mA quiescent current and 0.35V dropout voltage. This part is ROHS3 compliant and available in Tape & Reel packaging with 731 units in stock. The EMPX suffix indicates extended temperature or performance characteristics consistent with the original part designation.

Tertiary Recommendation: LP3874EMP-5.0/NOPB

The LP3874EMP-5.0/NOPB, manufactured by National Semiconductor, is an active product offering full parametric equivalence. It maintains all critical electrical specifications and protection features. This part is available in bulk packaging with the highest inventory level at 42,797 units. Note that the package designation is SOT-223 rather than SOT-223-5; verify pinout compatibility in the specific application.

Alternative: LP3961EMP-5.0/NOPB

The LP3961EMP-5.0/NOPB maintains the same base product number as the original part and is available in active status from Texas Instruments. It provides identical electrical performance and is ROHS3 compliant. This part is available in Tape & Reel packaging with 2,407 units in stock.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LP3961EMPX-5.0 with any of these substitute parts?

A: Yes, all listed substitute parts maintain identical electrical specifications (5V output, 800mA current, 0.35V dropout, -40°C to 125°C operating range) and package compatibility (SOT-223-5). They are pin-compatible and functionally equivalent for circuit operation.

Q: What is the difference between LP3871EMP-5.0/NOPB and the original LP3961EMPX-5.0?

A: The primary difference is quiescent current: LP3871EMP-5.0/NOPB operates at 5 mA versus 9 mA in the original part. This results in lower standby power consumption. All other electrical parameters are identical. The LP3871 is also in active production status, ensuring long-term availability.

Q: Why does LP3874EMP-5.0/NOPB show SOT-223 instead of SOT-223-5?

A: Both designations refer to the same physical package with five pins. Verify the pinout diagram in the manufacturer datasheet to confirm compatibility with your PCB layout. The electrical specifications and pin functions remain identical.

Q: Which substitute offers the best availability?

A: LP3874EMP-5.0/NOPB has the highest inventory at 42,797 units. However, all substitute parts maintain active production status with adequate stock levels for production requirements.

Q: Are all substitute parts RoHS compliant?

A: LP3871EMP-5.0/NOPB, LP3874EMPX-5.0/NOPB, and LP3961EMP-5.0/NOPB are ROHS3 compliant. LP3874EMP-5.0/NOPB compliance status is not specified in the provided data; verify with the supplier if RoHS certification is required for your application.

Q: What does the NOPB suffix indicate?

A: NOPB indicates "No Plumbum" (lead-free) packaging, confirming RoHS compliance and the absence of lead in the component.

Q: Can I use these parts interchangeably in existing designs?

A: Yes, all substitute parts are pin-compatible and electrically equivalent. No circuit modifications are required. However, verify the specific package variant (SOT-223 vs. SOT-223-5) matches your PCB footprint before assembly.