LP3872EMPX-2.5 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3872EMPX-2.5 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 2.5V output applications with 1.5A current capacity in SOT-223-5 surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The device provides regulated power management with integrated protection features including over-current, over-temperature, and short-circuit protection across an operating temperature range of -40°C to 125°C.

Key Parameters

Parameter	Value
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	2.5V
Voltage - Input (Max)	7V
Current - Output	1.5A
Voltage Dropout (Max)	0.55V @ 1.5A
Current - Quiescent (Iq)	5 mA
PSRR	73dB ~ 57dB (120Hz)
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

Substitute Part Grouping Explanation

Substitution eligibility for the LP3872EMPX-2.5 is determined by the following critical parameters:

Output voltage fixed at 2.5V
Maximum output current of 1.5A
Maximum input voltage of 7V
Positive output configuration with fixed regulation type
SOT-223-5 package compatibility
Surface mount technology
Operating temperature range -40°C to 125°C
Integrated protection features (over-current, over-temperature, short-circuit)

Substitute parts must maintain identical electrical specifications for output voltage, current capacity, input voltage rating, and package form factor. Variations in quiescent current, dropout voltage, and PSRR performance are acceptable provided they do not exceed the maximum ratings of the original part. Product status and RoHS compliance are secondary considerations that may influence procurement strategy but do not affect functional interchangeability.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage @ 1.5A	Quiescent Current	Package	RoHS Status
LP3872EMPX-2.5	Texas Instruments	Obsolete	2.5V	1.5A	7V	0.55V	5 mA	SOT-223-5	Non-compliant
LP3872EMPX-2.5/NOPB	National Semiconductor	Active	2.5V	1.5A	7V	0.55V	5 mA	SOT-223	Not specified
LP3852EMP-2.5/NOPB	Texas Instruments	Active	2.5V	1.5A	7V	0.44V	3 mA	SOT-223-5	ROHS3 Compliant
LP3855EMP-2.5/NOPB	Texas Instruments	Active	2.5V	1.5A	7V	0.44V	3 mA	SOT-223-5	ROHS3 Compliant
LP3872EMP-2.5/NOPB	National Semiconductor	Active	2.5V	1.5A	7V	0.55V	5 mA	SOT-223	Not specified
LP3875EMP-2.5/NOPB	Texas Instruments	Active	2.5V	1.5A	7V	0.55V	5 mA	SOT-223-5	ROHS3 Compliant
LP3962EMP-2.5/NOPB	Texas Instruments	Active	2.5V	1.5A	7V	0.55V	9 mA	SOT-223-5	ROHS3 Compliant
LP3965EMP-2.5/NOPB	Texas Instruments	Active	2.5V	1.5A	7V	0.55V	9 mA	SOT-223-5	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts listed maintain electrical compatibility with the LP3872EMPX-2.5 across the critical parameters of output voltage, current capacity, input voltage rating, and package form factor. Selection among available substitutes should prioritize active product status for long-term availability and supply chain stability.

For new designs or procurement requiring regulatory compliance, LP3852EMP-2.5/NOPB, LP3855EMP-2.5/NOPB, LP3875EMP-2.5/NOPB, LP3962EMP-2.5/NOPB, and LP3965EMP-2.5/NOPB are ROHS3 compliant alternatives. LP3852EMP-2.5/NOPB and LP3855EMP-2.5/NOPB offer improved performance characteristics with lower dropout voltage (0.44V versus 0.55V) and reduced quiescent current (3 mA versus 5 mA), resulting in lower power dissipation in battery-powered or thermally constrained applications.

LP3872EMP-2.5/NOPB and LP3872EMPX-2.5/NOPB from National Semiconductor provide direct electrical equivalence with identical dropout voltage and quiescent current specifications. LP3875EMP-2.5/NOPB, LP3962EMP-2.5/NOPB, and LP3965EMP-2.5/NOPB maintain the original electrical characteristics while offering active product status and ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can LP3852EMP-2.5/NOPB or LP3855EMP-2.5/NOPB be used as direct replacements for LP3872EMPX-2.5?

A: Yes. Both parts maintain identical output voltage (2.5V), output current (1.5A), input voltage rating (7V), and SOT-223-5 package specifications. The lower dropout voltage (0.44V versus 0.55V) and reduced quiescent current (3 mA versus 5 mA) represent performance improvements that do not affect functional interchangeability.

Q: What is the difference between LP3872EMPX-2.5/NOPB and LP3872EMP-2.5/NOPB?

A: Both parts are electrically identical with 2.5V output, 1.5A capacity, and 0.55V dropout voltage. The primary difference is manufacturer designation and packaging format. Verify package compatibility with your PCB design before substitution.

Q: Are all substitute parts available in the same SOT-223-5 package?

A: LP3852EMP-2.5/NOPB, LP3855EMP-2.5/NOPB, LP3875EMP-2.5/NOPB, LP3962EMP-2.5/NOPB, and LP3965EMP-2.5/NOPB are supplied in SOT-223-5 packaging. LP3872EMPX-2.5/NOPB and LP3872EMP-2.5/NOPB are supplied in SOT-223 packaging. Confirm package designation matches your PCB footprint requirements.

Q: Which substitute parts are ROHS3 compliant?

A: LP3852EMP-2.5/NOPB, LP3855EMP-2.5/NOPB, LP3875EMP-2.5/NOPB, LP3962EMP-2.5/NOPB, and LP3965EMP-2.5/NOPB are ROHS3 compliant. The original LP3872EMPX-2.5 is RoHS non-compliant.

Q: What is the impact of higher quiescent current in LP3962EMP-2.5/NOPB and LP3965EMP-2.5/NOPB?

A: These parts draw 9 mA quiescent current compared to 5 mA in the original part. In applications with continuous power draw, this results in approximately 4 mA additional standby current consumption. All other electrical parameters remain identical.

Q: Are there any temperature or protection feature differences among the substitute parts?

A: All substitute parts maintain the operating temperature range of -40°C to 125°C and include identical protection features: over-current, over-temperature, and short-circuit protection. No functional differences exist in these specifications.

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