LP3965EMP-2.5 Equivalent & Substitute Parts

Part Overview

The LP3965EMP-2.5 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 2.5V output at 1.5A in a SOT-223-5 surface mount package. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and production continuity. The part provides positive fixed output configuration with integrated protection features including over-current, over-temperature, and short-circuit protection, operating across the industrial temperature range of -40°C to 125°C.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	1.5A
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.55V @ 1.5A
Quiescent Current (Iq)	9 mA
Package Type	SOT-223-5 (TO-261-5, TO-261AB)
Output Configuration	Positive Fixed
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C to 125°C
Control Features	Enable

Substitute Part Grouping Explanation

Substitution of the LP3965EMP-2.5 is determined by strict equivalence across the following critical parameters:

Fixed output voltage of 2.5V
Output current capability of 1.5A minimum
Maximum input voltage of 7V
SOT-223-5 package compatibility (TO-261-5, TO-261AB)
Positive fixed output configuration
Enable control feature
Over-current, over-temperature, and short-circuit protection
Operating temperature range of -40°C to 125°C

Substitute parts are grouped into two categories: direct manufacturer equivalents (identical part numbers with different packaging or compliance status) and parametric equivalents (functionally compatible parts with minor variations in quiescent current or dropout voltage that remain within acceptable operating margins).

Parameter Comparison

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

Engineering Selection Recommendations

For new designs and production applications, LP3965EMP-2.5/NOPB is the primary direct substitute, offering identical electrical performance with active product status and ROHS3 compliance. This part maintains the same quiescent current (9 mA) and dropout voltage (0.55V @ 1.5A) as the obsolete LP3965EMP-2.5.

LP3852EMP-2.5/NOPB and LP3855EMP-2.5/NOPB provide parametric equivalence with improved performance characteristics: reduced quiescent current (3 mA versus 9 mA) and lower dropout voltage (0.44V @ 1.5A versus 0.55V @ 1.5A). Both are active, ROHS3 compliant, and suitable for applications where power efficiency is prioritized.

LP3875EMP-2.5/NOPB and LP3962EMP-2.5/NOPB maintain electrical equivalence to the original part with active status and ROHS3 compliance. LP3875EMP-2.5/NOPB features reduced quiescent current (5 mA), while LP3962EMP-2.5/NOPB matches the original specification exactly (9 mA Iq, 0.55V dropout).

LP3872EMP-2.5/NOPB and LP3872EMPX-2.5/NOPB from National Semiconductor are parametric equivalents with active status. These parts maintain the 0.55V dropout voltage and 1.5A output current but feature intermediate quiescent current (5 mA). Package designation differs slightly (SOT-223 versus SOT-223-5), requiring verification of PCB footprint compatibility.

All substitute parts maintain the required protection features (over-current, over-temperature, short-circuit), enable control functionality, and operate across the -40°C to 125°C temperature range.

Frequently Asked Questions (FAQ)

Q: Can LP3852EMP-2.5/NOPB or LP3855EMP-2.5/NOPB be used as direct replacements for LP3965EMP-2.5?

A: Yes. Both parts deliver the same 2.5V fixed output at 1.5A in the SOT-223-5 package with identical protection features and operating temperature range. The lower quiescent current (3 mA versus 9 mA) and reduced dropout voltage (0.44V versus 0.55V) represent performance improvements suitable for most applications.

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

A: Both parts are from National Semiconductor with identical electrical specifications: 2.5V output, 1.5A current, 0.55V dropout, and 5 mA quiescent current. The primary difference is packaging designation (SOT-223 versus SOT-223), which may affect PCB footprint compatibility. Verify footprint requirements before selection.

Q: Are there compliance differences between substitute parts?

A: LP3965EMP-2.5/NOPB, LP3852EMP-2.5/NOPB, LP3855EMP-2.5/NOPB, LP3875EMP-2.5/NOPB, and LP3962EMP-2.5/NOPB are all ROHS3 compliant. The original LP3965EMP-2.5 is RoHS non-compliant. LP3872EMP-2.5/NOPB and LP3872EMPX-2.5/NOPB do not specify RoHS status. For applications requiring RoHS compliance, select from the Texas Instruments active parts.

Q: Which substitute offers the best power efficiency?

A: LP3852EMP-2.5/NOPB and LP3855EMP-2.5/NOPB provide the lowest quiescent current at 3 mA and the lowest dropout voltage at 0.44V @ 1.5A, resulting in reduced power dissipation compared to the original specification.

Q: Is the SOT-223-5 package compatible with SOT-223?

A: SOT-223-5 and SOT-223 are related but distinct package designations. Verify PCB footprint compatibility with the specific package variant before substitution. LP3872EMP-2.5/NOPB and LP3872EMPX-2.5/NOPB use SOT-223, while most other substitutes use SOT-223-5.

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