LP3871EMP-1.8/NOPB Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3871EMP-1.8/NOPB is an active linear voltage regulator IC manufactured by Texas Instruments, designed for positive fixed 1.8V output applications. This Surface Mount device operates in the Power Management (PMIC) category and delivers 800mA output current with a maximum dropout voltage of 0.35V at full load. The part is actively produced and widely stocked, with 1887 units available in inventory. Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing, inventory constraints, or specific packaging preferences while maintaining identical electrical performance specifications.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LP3871EMP-1.8/NOPB
Output Voltage (Fixed)	1.8V
Output Current	800mA
Input Voltage (Max)	7V
Dropout Voltage (Max)	0.35V @ 800mA
Quiescent Current	5 mA
Operating Temperature Range	-40°C to 125°C
Package Type	SOT-223-5
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the LP3871EMP-1.8/NOPB are qualified based on the following critical electrical and mechanical parameters:

Output voltage specification: 1.8V fixed
Output current capability: 800mA
Maximum input voltage: 7V
Dropout voltage: 0.35V @ 800mA
Operating temperature range: -40°C to 125°C
Package compatibility: SOT-223-5 or SOT-223 footprint
Surface Mount configuration
Enable control feature
Protection features: Over Current, Over Temperature, Short Circuit

The following parts meet these substitution criteria: LP3874EMP-1.8/NOPB, LP3874EMPX-1.8/NOPB, LP3961EMP-1.8/NOPB, and LP3964EMP-1.8/NOPB. All substitute parts maintain identical output voltage, current rating, input voltage limits, dropout voltage, operating temperature range, and protection feature sets.

Parameter Comparison

Parameter	LP3871EMP-1.8/NOPB	LP3874EMP-1.8/NOPB	LP3874EMPX-1.8/NOPB	LP3961EMP-1.8/NOPB	LP3964EMP-1.8/NOPB
Manufacturer	Texas Instruments	National Semiconductor	Texas Instruments	National Semiconductor	Texas Instruments
Output Voltage	1.8V	1.8V	1.8V	1.8V	1.8V
Output Current	800mA	800mA	800mA	800mA	800mA
Input Voltage (Max)	7V	7V	7V	7V	7V
Dropout Voltage (Max)	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA
Quiescent Current	5 mA	9 mA	9 mA	9 mA	9 mA
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Package	SOT-223-5	SOT-223	SOT-223-5	SOT-223	SOT-223-5
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Control Features	Enable	Enable	Enable	Enable	Enable
Product Status	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts maintain active product status and are suitable for direct replacement in applications requiring 1.8V fixed output at 800mA. The LP3874EMPX-1.8/NOPB and LP3964EMP-1.8/NOPB are ROHS3 compliant, matching the primary part's environmental certification. The LP3874EMP-1.8/NOPB and LP3961EMP-1.8/NOPB do not specify RoHS compliance status in available documentation.

Quiescent current differs between the primary part (5 mA) and all substitute parts (9 mA). This parameter should be evaluated for applications with strict power consumption requirements during standby or low-load conditions.

Package designation varies between SOT-223 and SOT-223-5 formats. Both are compatible Surface Mount packages with identical pin configurations for this regulator class. Verify PCB footprint compatibility with your design layout before final selection.

Frequently Asked Questions (FAQ)

Q: Can LP3874EMP-1.8/NOPB replace LP3871EMP-1.8/NOPB in my design?

A: Yes. Both parts deliver identical output voltage (1.8V), output current (800mA), input voltage rating (7V max), dropout voltage (0.35V @ 800mA), operating temperature range (-40°C to 125°C), and protection features. The primary difference is quiescent current: LP3874EMP-1.8/NOPB draws 9 mA versus 5 mA for LP3871EMP-1.8/NOPB. Evaluate this difference for your specific power budget.

Q: What is the difference between SOT-223 and SOT-223-5 packages?

A: Both are Surface Mount packages with identical electrical pin configurations for linear regulators. SOT-223-5 explicitly designates 5 pins, while SOT-223 is the base package designation. PCB footprints are compatible. Verify your design's footprint library supports the specific variant you select.

Q: Are all substitute parts ROHS3 compliant?

A: LP3874EMPX-1.8/NOPB and LP3964EMP-1.8/NOPB are specified as ROHS3 compliant. LP3874EMP-1.8/NOPB and LP3961EMP-1.8/NOPB do not include RoHS compliance documentation in the provided specifications. Confirm compliance requirements with your procurement or regulatory team before selection.

Q: Which substitute part has the lowest quiescent current?

A: LP3871EMP-1.8/NOPB (primary part) has the lowest quiescent current at 5 mA. All substitute parts operate at 9 mA quiescent current. For battery-powered or ultra-low-power applications, the primary part is preferred if inventory is available.

Q: Can I use LP3961EMP-1.8/NOPB if my design requires PSRR specification?

A: LP3961EMP-1.8/NOPB does not include PSRR data in available documentation. If Power Supply Rejection Ratio is a critical design parameter, select LP3871EMP-1.8/NOPB, LP3874EMP-1.8/NOPB, or LP3874EMPX-1.8/NOPB, which specify PSRR at 73dB ~ 57dB (120Hz).

Q: What packaging options are available for these parts?

A: LP3871EMP-1.8/NOPB is supplied in Tape & Reel (TR) packaging. LP3874EMP-1.8/NOPB is supplied in Bulk packaging. LP3874EMPX-1.8/NOPB is supplied in Tape & Reel (TR). LP3961EMP-1.8/NOPB packaging is not specified. LP3964EMP-1.8/NOPB is supplied in Tape & Reel (TR). Confirm packaging requirements with your assembly process before ordering.

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