LP3875EMPX-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3875EMPX-ADJ is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This Surface Mount device delivers 1.5A output current in a compact SOT-223-5 package and is classified as obsolete. Due to its obsolete status, identifying equivalent and substitute parts is essential for design continuity, production planning, and system reliability in applications requiring adjustable positive voltage regulation.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Adjustable
Current - Output	1.5A
Voltage - Input (Max)	7V
Voltage - Output (Min/Fixed)	1.22V
Voltage - Output (Max)	6.4V
Voltage Dropout (Max)	0.55V @ 1.5A
Package / Case	TO-261-5, TO-261AB
Supplier Device Package	SOT-223-5
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 125°C
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitute parts for the LP3875EMPX-ADJ are identified based on strict electrical and mechanical parameter matching within the allowed specifications for adjustable linear voltage regulators. The substitution logic is based on the following critical parameters:

Output current capability: 1.5A
Adjustable output voltage range: 1.22V to 6.4V
Maximum input voltage: 7V
Package compatibility: SOT-223-5 (TO-261-5, TO-261AB)
Surface Mount mounting type
Operating temperature range: -40°C to 125°C
Control and protection features: Enable function with Over Current, Over Temperature, and Short Circuit protection

All identified substitutes maintain identical electrical specifications and package footprints, ensuring direct compatibility in existing designs.

Parameter Comparison

Parameter	LP3875EMPX-ADJ	LP3875EMPX-ADJ/NOPB	LP3875EMP-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	1.5A	1.5A	1.5A
Voltage - Input (Max)	7V	7V	7V
Voltage - Output (Min/Fixed)	1.22V	1.22V	1.22V
Voltage - Output (Max)	6.4V	6.4V	6.4V
Voltage Dropout (Max)	0.55V @ 1.5A	0.55V @ 1.5A	0.55V @ 1.5A
Current - Quiescent (Iq)	5 mA	5 mA	5 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
Control Features	Enable	Enable	Enable
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The LP3875EMPX-ADJ is classified as obsolete and should be replaced with active alternatives to ensure long-term supply chain reliability and regulatory compliance.

LP3875EMPX-ADJ/NOPB is the direct manufacturer equivalent with identical electrical and mechanical specifications. This part is currently active and carries ROHS3 compliance certification, addressing regulatory requirements absent in the original obsolete part. The /NOPB designation indicates lead-free plating, aligning with modern manufacturing standards.

LP3875EMP-ADJ/NOPB is a parametric equivalent offering identical electrical performance and package compatibility. This part is also active with ROHS3 compliance. The primary distinction is packaging format (Tape & Reel versus Cut Tape & Digi-Reel), which does not affect electrical or mechanical compatibility.

Both substitutes maintain full pin-for-pin and functional compatibility with the original LP3875EMPX-ADJ, enabling direct replacement without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can LP3875EMPX-ADJ/NOPB be used as a direct replacement for LP3875EMPX-ADJ?

A: Yes. Both parts share identical electrical specifications, output current rating (1.5A), adjustable voltage range (1.22V to 6.4V), and SOT-223-5 package footprint. The primary difference is product status (Active versus Obsolete) and RoHS compliance (ROHS3 Compliant versus non-compliant).

Q: What is the difference between LP3875EMPX-ADJ/NOPB and LP3875EMP-ADJ/NOPB?

A: Both parts are parametric equivalents with identical electrical performance and package specifications. The difference lies in packaging format: LP3875EMPX-ADJ/NOPB is supplied in Cut Tape (CT) & Digi-Reel format, while LP3875EMP-ADJ/NOPB is supplied in Tape & Reel (TR) format. Electrical and mechanical compatibility remain unchanged.

Q: Are these substitutes compatible with existing PCB designs?

A: Yes. All substitute parts use the same SOT-223-5 package (TO-261-5, TO-261AB case) and maintain identical pin configuration, enabling direct PCB footprint compatibility without layout modifications.

Q: Does the /NOPB designation affect functionality?

A: No. The /NOPB designation indicates lead-free plating and does not alter electrical performance or functional characteristics. It reflects compliance with lead-free manufacturing standards.

Q: What is the inventory status of these substitutes?

A: LP3875EMPX-ADJ/NOPB has 3400 units in stock. LP3875EMP-ADJ/NOPB has 2037 units in stock. Both are actively maintained by the manufacturer.

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