LP3965EMPX-2.5 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3965EMPX-2.5 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 2.5V output at 1.5A 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
Manufacturer Part Number	LP3965EMPX-2.5
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
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
Supply Current (Max)	15 mA
Package / Case	TO-261-5, TO-261AB (SOT-223-5)
Mounting Type	Surface Mount
Operating Temperature	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the LP3965EMPX-2.5 are selected based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

Output voltage: 2.5V fixed
Output current capability: 1.5A
Maximum input voltage: 7V
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 protection
Enable control feature

Acceptable Variation Parameters:

Voltage dropout (0.44V to 0.55V @ 1.5A)
Quiescent current (3 mA to 9 mA)
Supply current (10 mA to 15 mA)
PSRR specifications (when provided)
Product status (active substitutes acceptable for obsolete main part)
RoHS compliance status

All identified substitute parts meet these criteria and maintain functional equivalence with the LP3965EMPX-2.5 in applications requiring 2.5V regulated output at 1.5A.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout @ 1.5A	Iq (mA)	Package	Product Status	RoHS Status
LP3965EMPX-2.5	Texas Instruments	2.5V	1.5A	7V	0.55V	9	SOT-223-5	Obsolete	Non-compliant
LP3852EMP-2.5/NOPB	Texas Instruments	2.5V	1.5A	7V	0.44V	3	SOT-223-5	Active	ROHS3 Compliant
LP3855EMP-2.5/NOPB	Texas Instruments	2.5V	1.5A	7V	0.44V	3	SOT-223-5	Active	ROHS3 Compliant
LP3872EMP-2.5/NOPB	National Semiconductor	2.5V	1.5A	7V	0.55V	5	SOT-223	Active	Not specified
LP3872EMPX-2.5/NOPB	National Semiconductor	2.5V	1.5A	7V	0.55V	5	SOT-223	Active	Not specified
LP3875EMP-2.5/NOPB	Texas Instruments	2.5V	1.5A	7V	0.55V	5	SOT-223-5	Active	ROHS3 Compliant
LP3962EMP-2.5/NOPB	Texas Instruments	2.5V	1.5A	7V	0.55V	9	SOT-223-5	Active	ROHS3 Compliant
LP3965EMP-2.5/NOPB	Texas Instruments	2.5V	1.5A	7V	0.55V	9	SOT-223-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

LP3965EMP-2.5/NOPB and LP3962EMP-2.5/NOPB are direct functional equivalents with identical electrical specifications to the LP3965EMPX-2.5. Both are active products from Texas Instruments with ROHS3 compliance, making them preferred choices for new designs and ongoing production. These parts maintain the same 0.55V dropout voltage and 9 mA quiescent current as the original part.

Secondary Substitutes (Enhanced Performance):

LP3852EMP-2.5/NOPB and LP3855EMP-2.5/NOPB offer improved performance characteristics with lower dropout voltage (0.44V) and reduced quiescent current (3 mA). Both are active Texas Instruments products with ROHS3 compliance. These parts are suitable for applications where lower power dissipation and improved efficiency are beneficial.

Alternative Substitutes (Functional Equivalence):

LP3872EMP-2.5/NOPB and LP3872EMPX-2.5/NOPB from National Semiconductor maintain electrical equivalence with matching 1.5A output current and 7V maximum input voltage. These parts are active products with identical dropout voltage (0.55V) and comparable quiescent current (5 mA). Package designation differs slightly (SOT-223 vs SOT-223-5), but both are compatible with TO-261-5 and TO-261AB footprints.

LP3875EMP-2.5/NOPB is an active Texas Instruments product with ROHS3 compliance, matching all critical electrical parameters of the original part with identical dropout voltage and comparable quiescent current.

Compliance Considerations:

For applications requiring RoHS 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. The LP3872 variants do not specify RoHS status and should be verified with the supplier if compliance is required.

Frequently Asked Questions (FAQ)

Q: Can I use LP3852EMP-2.5/NOPB as a direct replacement for LP3965EMPX-2.5?

A: Yes. Both parts deliver 2.5V at 1.5A in SOT-223-5 packaging with identical maximum input voltage (7V) and operating temperature range (-40°C to 125°C). The LP3852EMP-2.5/NOPB offers improved performance with lower dropout voltage (0.44V vs 0.55V) and reduced quiescent current (3 mA vs 9 mA). It is an active product with ROHS3 compliance.

Q: What is the difference between LP3965EMPX-2.5 and LP3965EMP-2.5/NOPB?

A: Both parts are from Texas Instruments with identical electrical specifications (2.5V output, 1.5A current, 0.55V dropout, 9 mA quiescent current). The primary difference is product status: LP3965EMPX-2.5 is obsolete while LP3965EMP-2.5/NOPB is active. The LP3965EMP-2.5/NOPB also carries ROHS3 compliance certification.

Q: Are National Semiconductor LP3872 parts compatible with the original LP3965EMPX-2.5?

A: Yes. LP3872EMP-2.5/NOPB and LP3872EMPX-2.5/NOPB maintain electrical equivalence with 2.5V output, 1.5A current capability, and 7V maximum input voltage. Both are active products. Package designation shows SOT-223 rather than SOT-223-5, but both are compatible with TO-261-5 and TO-261AB footprints used by the original part.

Q: Which substitute offers the best power efficiency?

A: LP3852EMP-2.5/NOPB and LP3855EMP-2.5/NOPB provide the lowest quiescent current (3 mA) and lowest dropout voltage (0.44V @ 1.5A), resulting in reduced power dissipation compared to the original LP3965EMPX-2.5 (9 mA quiescent, 0.55V dropout).

Q: Do all substitute parts support the Enable control feature?

A: Yes. All identified substitute parts include Enable control functionality, matching the control features of the LP3965EMPX-2.5.

Q: Are all substitute parts rated for -40°C to 125°C operation?

A: Yes. All substitute parts maintain the same operating temperature range (-40°C to 125°C) as the original LP3965EMPX-2.5.

Q: What packaging options are available for substitutes?

A: All substitute parts use SOT-223 or SOT-223-5 surface mount packages compatible with TO-261-5 and TO-261AB footprints. Packaging formats vary (Tape & Reel, Bulk, Cut Tape & Digi-Reel) depending on the specific part number and supplier.

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