LP3874EMP-5.0 Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The LP3874EMP-5.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 5V output applications with 800mA current capacity in a SOT-223-5 surface mount package. This part is classified as obsolete, making equivalent and 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 low-dropout applications requiring stable power delivery.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	800mA
Input Voltage (Max)	7V
Dropout Voltage (Max)	0.35V @ 800mA
Quiescent Current	5-9 mA
Package Type	SOT-223-5
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitute parts for the LP3874EMP-5.0 are qualified based on the following critical parameters that must remain constant across all alternatives:

Output voltage: 5V fixed
Output current capacity: 800mA
Maximum input voltage: 7V
Dropout voltage: 0.35V @ 800mA
Package type: SOT-223-5
Operating temperature range: -40°C to 125°C
Protection features: Over Current, Over Temperature, Short Circuit
Control features: Enable function

All substitute parts listed maintain these electrical and mechanical specifications, ensuring direct functional equivalence in circuit applications. Variations in quiescent current (Iq) and product status (active vs. obsolete) do not affect substitution eligibility when all primary parameters align.

Parameter Comparison

Parameter	LP3874EMP-5.0	LP3871EMP-5.0/NOPB	LP3874EMP-5.0/NOPB	LP3874EMPX-5.0/NOPB	LP3961EMP-5.0/NOPB
Manufacturer	Texas Instruments	Texas Instruments	National Semiconductor	Texas Instruments	Texas Instruments
Output Voltage	5V	5V	5V	5V	5V
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 (Iq)	9 mA	5 mA	9 mA	9 mA	9 mA
Package Type	SOT-223-5	SOT-223-5	SOT-223	SOT-223-5	SOT-223-5
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
Product Status	Obsolete	Active	Active	Active	Active
RoHS Compliance	Non-compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For new designs and production applications, LP3871EMP-5.0/NOPB, LP3874EMPX-5.0/NOPB, and LP3961EMP-5.0/NOPB are preferred alternatives to the obsolete LP3874EMP-5.0. All three active substitutes maintain identical electrical specifications and package compatibility.

LP3871EMP-5.0/NOPB offers the additional advantage of reduced quiescent current (5 mA versus 9 mA), resulting in lower standby power consumption in battery-powered or low-power applications. This part carries ROHS3 compliance certification.

LP3874EMP-5.0/NOPB from National Semiconductor provides functional equivalence with active product status, though RoHS compliance status is not specified in available documentation.

LP3874EMPX-5.0/NOPB maintains identical electrical performance to the original part with ROHS3 compliance and active product status, making it a direct replacement option.

LP3961EMP-5.0/NOPB is functionally equivalent with ROHS3 compliance and active status. PSRR specification is not provided for this variant.

For applications requiring RoHS3 compliance certification, LP3871EMP-5.0/NOPB, LP3874EMPX-5.0/NOPB, and LP3961EMP-5.0/NOPB are suitable selections. All substitute parts are available in active production status, ensuring long-term supply continuity.

Frequently Asked Questions (FAQ)

Q: Can LP3871EMP-5.0/NOPB replace LP3874EMP-5.0 in existing designs?

A: Yes. LP3871EMP-5.0/NOPB maintains all critical electrical parameters including 5V output, 800mA current capacity, 0.35V dropout voltage, and SOT-223-5 package compatibility. The reduced quiescent current (5 mA) is a secondary benefit that does not affect circuit functionality.

Q: What is the difference between LP3874EMP-5.0 and LP3874EMPX-5.0/NOPB?

A: Both parts share identical electrical specifications and SOT-223-5 packaging. The primary difference is product status: LP3874EMP-5.0 is obsolete while LP3874EMPX-5.0/NOPB is active production. The NOPB suffix indicates lead-free packaging compliance.

Q: Are all substitute parts available in the same package?

A: All substitute parts use SOT-223-5 or SOT-223 packaging, maintaining surface mount compatibility. PCB layout and footprint remain unchanged for direct substitution.

Q: Which substitute part should be selected for new production?

A: LP3871EMP-5.0/NOPB is recommended for new designs due to lower quiescent current consumption and ROHS3 compliance. LP3874EMPX-5.0/NOPB and LP3961EMP-5.0/NOPB are equally valid alternatives if specific supply chain or inventory considerations apply.

Q: Do substitute parts require circuit modifications?

A: No. All substitute parts are pin-compatible and electrically equivalent. No circuit modifications, PCB redesign, or firmware changes are required for substitution.

Q: What is the significance of the NOPB designation?

A: NOPB indicates the part is manufactured in a lead-free process and complies with RoHS directives. This designation is standard for active production parts from Texas Instruments and National Semiconductor.

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