LP3874EMP-1.8/NOPB Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3874EMP-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 used in embedded systems, consumer electronics, and industrial applications requiring stable 1.8V power rails with low dropout characteristics.

Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing due to inventory constraints, supply chain considerations, or specific packaging preferences while maintaining identical electrical performance and thermal operating ranges.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Output Voltage (Fixed)	1.8V
Output Current	800mA
Input Voltage (Max)	7V
Dropout Voltage (Max)	0.35V @ 800mA
Quiescent Current	9mA
Operating Temperature Range	-40°C to 125°C
Package Type	SOT-223-5 (TO-261-5, TO-261AB)
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LP3874EMP-1.8/NOPB are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Output voltage: 1.8V fixed
Output current capability: 800mA
Input voltage maximum: 7V
Dropout voltage: 0.35V @ 800mA
Package type: SOT-223-5 or equivalent TO-261-5/TO-261AB footprint
Operating temperature range: -40°C to 125°C
Protection features: Over Current, Over Temperature, Short Circuit
Control features: Enable function

All identified substitute parts maintain these electrical specifications and package compatibility, enabling direct functional replacement in circuit designs.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Quiescent Current	Package	Operating Temp	Product Status
LP3874EMP-1.8/NOPB	Texas Instruments	1.8V	800mA	7V	0.35V @ 800mA	9mA	SOT-223-5	-40°C to 125°C	Active
LP3874EMPX-1.8/NOPB	Texas Instruments	1.8V	800mA	7V	0.35V @ 800mA	9mA	SOT-223-5	-40°C to 125°C	Active
LP3871EMP-1.8/NOPB	National Semiconductor	1.8V	800mA	7V	0.35V @ 800mA	5mA	SOT-223	-40°C to 125°C	Active
LP3961EMP-1.8/NOPB	National Semiconductor	1.8V	800mA	7V	0.35V @ 800mA	9mA	SOT-223	-40°C to 125°C	Active
LP3964EMP-1.8/NOPB	Texas Instruments	1.8V	800mA	7V	0.35V @ 800mA	9mA	SOT-223-5	-40°C to 125°C	Active

Engineering Selection Recommendations

All substitute parts listed maintain active product status with equivalent electrical performance specifications. Selection between LP3874EMP-1.8/NOPB and its substitutes should be based on:

Manufacturer Preference: Texas Instruments variants (LP3874EMP-1.8/NOPB, LP3874EMPX-1.8/NOPB, LP3964EMP-1.8/NOPB) and National Semiconductor variants (LP3871EMP-1.8/NOPB, LP3961EMP-1.8/NOPB) are all ROHS3 compliant and REACH unaffected.

Packaging Considerations: LP3874EMPX-1.8/NOPB and LP3964EMP-1.8/NOPB are supplied in Tape & Reel format, matching the original part's packaging. LP3871EMP-1.8/NOPB and LP3961EMP-1.8/NOPB are available in Bulk packaging.

Quiescent Current Variation: LP3871EMP-1.8/NOPB operates at 5mA quiescent current, lower than the 9mA specification of other variants, providing reduced standby power consumption in battery-powered applications.

Inventory Availability: Current stock levels range from 1,267 to 4,200 units across all variants, supporting immediate procurement requirements.

Frequently Asked Questions (FAQ)

Q: Can LP3871EMP-1.8/NOPB replace LP3874EMP-1.8/NOPB directly?

A: Yes. Both parts deliver identical output voltage (1.8V), output current (800mA), input voltage rating (7V maximum), and dropout voltage (0.35V @ 800mA). The LP3871EMP-1.8/NOPB operates at lower quiescent current (5mA vs. 9mA), making it suitable for applications prioritizing reduced standby power consumption. Package footprint compatibility (SOT-223) supports direct PCB placement.

Q: What is the difference between LP3874EMP-1.8/NOPB and LP3874EMPX-1.8/NOPB?

A: Both are Texas Instruments products with identical electrical specifications. The primary difference is packaging: LP3874EMP-1.8/NOPB is supplied in Tape & Reel format, while LP3874EMPX-1.8/NOPB is also Tape & Reel. Both maintain SOT-223-5 package type and are suitable for automated assembly processes.

Q: Are National Semiconductor parts (LP3871, LP3961) compatible with Texas Instruments designs?

A: Yes. All substitute parts maintain the same electrical performance parameters, operating temperature range (-40°C to 125°C), protection features (Over Current, Over Temperature, Short Circuit), and control features (Enable). SOT-223 package footprints are mechanically compatible with SOT-223-5 designs.

Q: Which substitute part offers the lowest power consumption?

A: LP3871EMP-1.8/NOPB operates at 5mA quiescent current, compared to 9mA for other variants. This 4mA reduction is beneficial in battery-powered or low-power standby applications.

Q: Can these parts be used interchangeably in production?

A: All listed parts are active products with ROHS3 compliance and REACH unaffected status. Electrical and thermal specifications are equivalent. Design validation should confirm package footprint compatibility with existing PCB layouts, particularly when transitioning between SOT-223 and SOT-223-5 variants.

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