LP3874EMPX-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3874EMPX-ADJ is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This Surface Mount device delivers 800mA output current in a compact SOT-223-5 package and is classified as Obsolete. Due to its obsolete status, identifying active equivalent parts is essential for design continuity and procurement planning. The substitute parts listed maintain identical electrical and mechanical specifications while offering improved availability and current product status.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Adjustable
Number of Regulators	1
Current - Output	800mA
Voltage - Input (Max)	7V
Voltage - Output (Min/Fixed)	1.2V
Voltage - Output (Max)	6.6V
Voltage Dropout (Max)	0.35V @ 800mA
Package / Case	TO-261-5, TO-261AB
Supplier Device Package	SOT-223-5
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 125°C

Substitute Part Grouping Explanation

Substitution for the LP3874EMPX-ADJ is determined by strict equivalence across the following critical parameters:

Output current capacity: 800mA
Output voltage range: 1.2V to 6.6V adjustable
Input voltage maximum: 7V
Dropout voltage: 0.35V @ 800mA
Package type: SOT-223-5 (TO-261-5, TO-261AB)
Surface Mount configuration
Operating temperature range: -40°C to 125°C
Protection features: Over Current, Over Temperature, Short Circuit
Control features: Enable function

The identified substitute parts LP3874EMP-ADJ/NOPB and LP3874EMPX-ADJ/NOPB maintain complete electrical and mechanical compatibility with the main part while differing in product status and compliance certifications.

Parameter Comparison

Parameter	LP3874EMPX-ADJ	LP3874EMP-ADJ/NOPB	LP3874EMPX-ADJ/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active
Output Configuration	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable
Current - Output	800mA	800mA	800mA
Voltage - Input (Max)	7V	7V	7V
Voltage - Output (Min/Fixed)	1.2V	1.2V	1.2V
Voltage - Output (Max)	6.6V	6.6V	6.6V
Voltage Dropout (Max)	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA
Current - Quiescent (Iq)	9 mA	9 mA	9 mA
PSRR	73dB ~ 57dB (120Hz)	73dB ~ 57dB (120Hz)	73dB ~ 57dB (120Hz)
Package / Case	TO-261-5, TO-261AB	TO-261-5, TO-261AB	TO-261-5, TO-261AB
Supplier Device Package	SOT-223-5	SOT-223-5	SOT-223-5
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

Both LP3874EMP-ADJ/NOPB and LP3874EMPX-ADJ/NOPB are direct functional equivalents to the LP3874EMPX-ADJ. The primary distinction lies in product status and regulatory compliance:

The LP3874EMPX-ADJ is classified as Obsolete and carries RoHS non-compliant status. For new designs or ongoing production requiring regulatory compliance, either LP3874EMP-ADJ/NOPB or LP3874EMPX-ADJ/NOPB should be selected. Both substitute parts are Active products with ROHS3 Compliant certification, ensuring compliance with current environmental and regulatory requirements.

All three parts are electrically and mechanically identical across all specified parameters, including output current, voltage ranges, dropout characteristics, thermal performance, and protection features. Selection between the two active substitutes may be determined by packaging preference and supplier availability.

Frequently Asked Questions (FAQ)

Q: Can LP3874EMP-ADJ/NOPB or LP3874EMPX-ADJ/NOPB be used as direct replacements for LP3874EMPX-ADJ?

A: Yes. Both substitute parts maintain identical electrical specifications and mechanical packaging. All three parts deliver 800mA adjustable output from 1.2V to 6.6V, operate across -40°C to 125°C, and use the SOT-223-5 package. The substitutes are Active products with improved compliance status.

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

A: Both parts are electrically and mechanically equivalent with identical performance parameters. The difference lies in the part number suffix designation. Both are Active products with ROHS3 Compliant certification and equivalent availability.

Q: Why is the original LP3874EMPX-ADJ marked as Obsolete?

A: The Obsolete status indicates the part is no longer in active production. The substitute parts LP3874EMP-ADJ/NOPB and LP3874EMPX-ADJ/NOPB represent the current active alternatives from Texas Instruments for this regulator function.

Q: Are there any differences in the SOT-223-5 package between these parts?

A: No. All three parts use identical SOT-223-5 packaging with TO-261-5 and TO-261AB case designations. PCB layout and thermal characteristics remain unchanged across all variants.

Q: What is the significance of the /NOPB suffix?

A: The /NOPB designation indicates the part is supplied without lead (Pb), reflecting RoHS compliance. This is standard for current production parts from Texas Instruments.

Q: Can the LP3874EMPX-ADJ be used in new designs requiring RoHS compliance?

A: No. The LP3874EMPX-ADJ is RoHS non-compliant. For designs requiring RoHS compliance, use LP3874EMP-ADJ/NOPB or LP3874EMPX-ADJ/NOPB, both of which are ROHS3 Compliant.

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