LP3875EMP-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3875EMP-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 includes integrated protection features for over-current, over-temperature, and short-circuit conditions. The main part is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Adjustable
Number of Regulators	1
Voltage - Input (Max)	7V
Voltage - Output (Min/Fixed)	1.22V
Voltage - Output (Max)	6.4V
Current - Output	1.5A
Voltage Dropout (Max)	0.55V @ 1.5A
Current - Quiescent (Iq)	5 mA
PSRR	73dB ~ 57dB (120Hz)
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	TO-261-5, TO-261AB
Supplier Device Package	SOT-223-5

Substitute Part Grouping Explanation

Substitute parts for the LP3875EMP-ADJ are determined by strict equivalence across all critical electrical and mechanical parameters. The substitution logic is based on the following key criteria:

Electrical Parameters (Must Match):

Output configuration: Positive
Output type: Adjustable
Maximum input voltage: 7V
Output voltage range: 1.22V to 6.4V
Output current: 1.5A
Voltage dropout: 0.55V @ 1.5A
Quiescent current: 5 mA
PSRR: 73dB ~ 57dB (120Hz)
Control features: Enable
Protection features: Over Current, Over Temperature, Short Circuit
Operating temperature range: -40°C ~ 125°C

Mechanical Parameters (Must Match):

Mounting type: Surface Mount
Package / Case: TO-261-5, TO-261AB
Supplier device package: SOT-223-5

All identified substitute parts maintain identical electrical specifications and physical packaging, ensuring direct functional and mechanical compatibility with the original LP3875EMP-ADJ design.

Parameter Comparison

Parameter	LP3875EMP-ADJ	LP3875EMP-ADJ/NOPB	LP3875EMPX-ADJ/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active
Output Configuration	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable
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
Current - Output	1.5A	1.5A	1.5A
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)
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
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
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
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Both LP3875EMP-ADJ/NOPB and LP3875EMPX-ADJ/NOPB are active, production-status alternatives to the obsolete LP3875EMP-ADJ. These substitute parts maintain complete electrical and mechanical equivalence with the original design.

The primary distinction between substitute options is regulatory compliance status. LP3875EMP-ADJ/NOPB and LP3875EMPX-ADJ/NOPB are both ROHS3 compliant, whereas the original LP3875EMP-ADJ is RoHS non-compliant. For applications subject to RoHS regulations or environmental compliance requirements, either active substitute part is appropriate. Both parts are available in active production status, ensuring long-term supply continuity.

Frequently Asked Questions (FAQ)

Q: Can LP3875EMP-ADJ/NOPB and LP3875EMPX-ADJ/NOPB be used interchangeably with LP3875EMP-ADJ?

A: Yes. Both substitute parts are parametric equivalents with identical electrical specifications and SOT-223-5 package configuration. Direct substitution is supported without circuit modification.

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

A: Both parts are electrically and mechanically identical. The primary difference is the product designation suffix. Both are ROHS3 compliant and available in active production status.

Q: Why is the original LP3875EMP-ADJ classified as obsolete?

A: Product obsolescence is determined by manufacturer lifecycle decisions. Active substitute parts with identical specifications are available to support ongoing design requirements.

Q: Are there any packaging differences between the main part and substitutes?

A: No. All parts use the same SOT-223-5 package (TO-261-5, TO-261AB case). Mechanical compatibility is maintained across all variants.

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

A: The /NOPB suffix indicates the part is supplied without lead (Pb), consistent with RoHS3 compliance requirements.

Q: Can these parts be used in new designs?

A: Yes. LP3875EMP-ADJ/NOPB and LP3875EMPX-ADJ/NOPB are active production parts suitable for new design implementations. The obsolete LP3875EMP-ADJ should not be used in new designs.

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