LP3874EMP-2.5 Equivalent & Substitute Parts

Part Overview

The LP3874EMP-2.5 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive output of 2.5V at 800mA in a SOT-223-5 surface mount package. The device is currently listed as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP3874EMP-2.5
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Fixed)	2.5V
Current - Output	800mA
Voltage - Input (Max)	7V
Voltage Dropout (Max)	0.35V @ 800mA
Current - Quiescent (Iq)	9 mA
PSRR	73dB ~ 57dB (120Hz)
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C
Package / Case	TO-261-5, TO-261AB
Supplier Device Package	SOT-223-5
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the LP3874EMP-2.5 is determined by strict equivalence across the following critical parameters:

Fixed output voltage: 2.5V
Output current capability: 800mA
Maximum input voltage: 7V
Voltage dropout: 0.35V @ 800mA
Control features: Enable function
Protection features: Over Current, Over Temperature, Short Circuit
Package type: SOT-223-5 (TO-261-5, TO-261AB)
Operating temperature range: -40°C ~ 125°C
Mounting type: Surface Mount

All identified substitute parts maintain these electrical and mechanical specifications. Substitutes differ primarily in product status (active vs. obsolete), quiescent current characteristics, PSRR specifications where available, and RoHS compliance status.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Iq (mA)	Package	Product Status	RoHS Status
LP3874EMP-2.5	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9	SOT-223-5	Obsolete	RoHS non-compliant
LP3871EMP-2.5/NOPB	National Semiconductor	2.5V	800mA	7V	0.35V @ 800mA	5	SOT-223	Active	Not specified
LP3874EMP-2.5/NOPB	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9	SOT-223-5	Active	ROHS3 Compliant
LP3961EMP-2.5	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9	SOT-223-5	Last Time Buy	ROHS3 Compliant
LP3961EMP-2.5/NOPB	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9	SOT-223-5	Active	ROHS3 Compliant
LP3964EMP-2.5/NOPB	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9	SOT-223-5	Active	ROHS3 Compliant
LP3964EMPX-2.5/NOPB	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9	SOT-223-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

For replacement of the obsolete LP3874EMP-2.5, the following selection criteria apply:

Primary Recommendation: LP3874EMP-2.5/NOPB is the direct equivalent from Texas Instruments with active product status and ROHS3 compliance. This part maintains identical electrical specifications and package configuration while offering current availability and regulatory compliance.

Alternative Options: LP3961EMP-2.5/NOPB and LP3964EMP-2.5/NOPB are functionally equivalent active parts from Texas Instruments with ROHS3 compliance. Both maintain the same electrical performance and SOT-223-5 packaging.

Secondary Option: LP3871EMP-2.5/NOPB from National Semiconductor is parametrically equivalent with lower quiescent current (5mA vs. 9mA). This part is active and suitable for applications where reduced standby power consumption is beneficial.

End-of-Life Consideration: LP3961EMP-2.5 carries Last Time Buy status and should be avoided for new designs requiring long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can LP3874EMP-2.5 be directly replaced with LP3874EMP-2.5/NOPB?

A: Yes. Both parts are electrically and mechanically identical. The /NOPB suffix indicates lead-free solder ball construction and RoHS3 compliance. The primary difference is product status: the original is obsolete while the /NOPB variant is active.

Q: What is the difference between LP3961EMP-2.5 and LP3961EMP-2.5/NOPB?

A: LP3961EMP-2.5 is Last Time Buy status, while LP3961EMP-2.5/NOPB is Active. Both share identical electrical specifications. For new designs, LP3961EMP-2.5/NOPB is the preferred choice.

Q: Why does LP3871EMP-2.5/NOPB have lower quiescent current?

A: LP3871EMP-2.5/NOPB is a different device variant with optimized quiescent current performance (5mA vs. 9mA). All other electrical parameters remain equivalent, making it suitable for power-sensitive applications.

Q: Are all substitute parts available in SOT-223-5 packaging?

A: LP3871EMP-2.5/NOPB is specified in SOT-223 packaging. All other substitutes use SOT-223-5. Both package variants are mechanically compatible with TO-261-5 and TO-261AB footprints.

Q: What is the significance of ROHS3 compliance?

A: ROHS3 compliance indicates the part meets current Restriction of Hazardous Substances regulations. The original LP3874EMP-2.5 is RoHS non-compliant. All active substitute parts carry ROHS3 compliance, meeting modern procurement and environmental standards.

Q: Can LP3964EMPX-2.5/NOPB be used interchangeably with LP3964EMP-2.5/NOPB?

A: Yes. Both parts are parametrically equivalent with identical electrical specifications and SOT-223-5 packaging. The X suffix indicates a variant designation but does not affect functional compatibility.

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