LP3871EMP-1.8 Equivalent & Substitute Parts

Part Overview

The LP3871EMP-1.8 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive 1.8V output at 800mA with a maximum dropout voltage of 0.35V at full load. The device integrates over-current, over-temperature, and short-circuit protection, making it suitable for low-power supply applications requiring ultra-low dropout characteristics.

The LP3871EMP-1.8 is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance of systems utilizing this regulator.

Substiute Parts

LP3871EMP-1.8

Texas InstrumentsIn Stock: 1173LP3871EMP-1.8 Datasheet

Current PartRFQ

LP3871EMP-1.8/NOPB

National SemiconductorIn Stock: 3603LP3871EMP-1.8/NOPB Datasheet

Parametric EquivalentRFQ

LP3874EMP-1.8/NOPB

National SemiconductorIn Stock: 3337LP3874EMP-1.8/NOPB Datasheet

Parametric EquivalentRFQ

LP3874EMPX-1.8/NOPB

Texas InstrumentsIn Stock: 4235LP3874EMPX-1.8/NOPB Datasheet

Parametric EquivalentRFQ

LP3961EMP-1.8/NOPB

National SemiconductorIn Stock: 2885LP3961EMP-1.8/NOPB Datasheet

Parametric EquivalentRFQ

LP3961EMPX-1.8/NOPB

Texas InstrumentsIn Stock: 821LP3961EMPX-1.8/NOPB Datasheet

Parametric EquivalentRFQ

LP3964EMP-1.8/NOPB

Texas InstrumentsIn Stock: 1375LP3964EMP-1.8/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP3871EMP-1.8 are qualified based on the following critical parameters that determine functional interchangeability:

• Fixed output voltage of 1.8V
• Output current capability of 800mA
• Maximum input voltage of 7V
• Dropout voltage specification of 0.35V @ 800mA
• Positive fixed output configuration
• SOT-223-5 package compatibility
• Operating temperature range of -40°C to 125°C
• Integrated protection features (over-current, over-temperature, short-circuit)
• Enable control feature

All identified substitute parts meet these core electrical and mechanical parameters. Variations in quiescent current (Iq) and PSRR specifications do not disqualify substitution when other parameters remain within acceptable tolerances for the application.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed maintain active product status with current manufacturer support, providing supply chain continuity for the obsolete LP3871EMP-1.8. Selection between substitutes should be based on the following criteria:

Packaging and Form Factor: Parts designated with the "X" suffix (LP3874EMPX-1.8/NOPB, LP3961EMPX-1.8/NOPB, LP3964EMP-1.8/NOPB) are supplied in Tape & Reel packaging, matching the original LP3871EMP-1.8 format. Parts without the "X" suffix are supplied in Bulk packaging.

Compliance Status: LP3874EMPX-1.8/NOPB, LP3961EMPX-1.8/NOPB, and LP3964EMP-1.8/NOPB are RoHS3 compliant, while the original LP3871EMP-1.8 is RoHS non-compliant. This distinction is relevant for applications subject to RoHS regulations.

Quiescent Current: The original LP3871EMP-1.8 specifies 5mA quiescent current. Substitute parts LP3874EMP-1.8/NOPB, LP3874EMPX-1.8/NOPB, LP3961EMP-1.8/NOPB, LP3961EMPX-1.8/NOPB, and LP3964EMP-1.8/NOPB specify 9mA quiescent current. This difference may impact standby power consumption in battery-powered applications.

Inventory Availability: Current stock levels vary across substitute parts, with LP3874EMPX-1.8/NOPB offering the highest availability at 4200 units.

Frequently Asked Questions (FAQ)

Q: Can LP3874EMPX-1.8/NOPB directly replace LP3871EMP-1.8 in existing designs?

A: Yes. Both parts share identical electrical specifications for output voltage (1.8V), output current (800mA), input voltage rating (7V), and dropout voltage (0.35V @ 800mA). Both use SOT-223-5 packaging and are supplied in Tape & Reel format. The primary difference is the increased quiescent current (9mA vs. 5mA), which may be acceptable depending on application power budget requirements.

Q: What is the significance of the "X" suffix in part numbers like LP3874EMPX-1.8/NOPB?

A: The "X" suffix indicates Tape & Reel packaging format, matching the original LP3871EMP-1.8 packaging type. Parts without the "X" suffix are supplied in Bulk packaging. For automated assembly processes, Tape & Reel format is typically preferred.

Q: Are there compliance differences between substitute options?

A: Yes. LP3874EMPX-1.8/NOPB, LP3961EMPX-1.8/NOPB, and LP3964EMP-1.8/NOPB are RoHS3 compliant. The original LP3871EMP-1.8 is RoHS non-compliant. All parts are REACH unaffected and classified under ECCN EAR99. Compliance requirements should be verified against your application's regulatory obligations.

Q: How does the quiescent current difference affect component selection?

A: The original LP3871EMP-1.8 draws 5mA quiescent current, while most substitute parts draw 9mA. In applications with continuous operation or minimal load current, this 4mA difference may be negligible. In battery-powered or low-power standby applications, this difference should be evaluated against total system power budget.

Q: Are all substitute parts electrically interchangeable?

A: All substitute parts maintain the same output voltage (1.8V), output current (800mA), input voltage rating (7V), dropout voltage (0.35V @ 800mA), and protection features. They are electrically interchangeable for applications where the quiescent current variation and compliance status do not impose constraints.

Q: Which substitute part offers the best supply availability?

A: LP3874EMPX-1.8/NOPB currently has the highest inventory level at 4200 units in stock, followed by LP3871EMP-1.8/NOPB at 3550 units.