LP3965ESX-2.5 Equivalent & Substitute Parts

Part Overview

The LP3965ESX-2.5 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 2.5V output at 1.5A in a TO-263 (DDPAK-5) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device provides positive fixed output configuration with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for applications requiring stable low-voltage power delivery with thermal management capabilities.

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
Operating Temperature Range	-40°C to 125°C
Package Type	TO-263 (DDPAK-5)
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution for the LP3965ESX-2.5 is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Critical Parameters for Direct Substitution:

Fixed output voltage of 2.5V
Output current capability of 1.5A minimum
Maximum input voltage of 7V or greater
TO-263 (DDPAK-5) package compatibility
Operating temperature range of -40°C to 125°C
Enable control feature
Over-current, over-temperature, and short-circuit protection

Substitution Categories:

Direct Manufacturer Equivalent: LP3965ESX-2.5/NOPB matches all electrical and mechanical specifications with identical performance characteristics. The primary difference is product status (Active vs. Obsolete) and packaging format (Tape & Reel vs. bulk).

Parametric Equivalents: LP3852ESX-2.5/NOPB, LP3855ESX-2.5/NOPB, LP3872ESX-2.5/NOPB, and LP3875ESX-2.5/NOPB maintain identical output voltage, current rating, input voltage limits, package type, and operating temperature range. These parts differ in quiescent current (3-5 mA vs. 9 mA) and voltage dropout characteristics (0.38V vs. 0.55V), representing performance improvements while maintaining functional compatibility.

Parametric Equivalent from Alternative Manufacturer: LP3962ESX-2.5/NOPB (National Semiconductor) provides identical electrical specifications and package compatibility with equivalent performance to the original part.

Cross-Manufacturer Alternatives: MIC39151-2.5WU and MIC39151-2.5WU-TR (Microchip Technology) deliver the same 2.5V output and 1.5A current in TO-263-5 package with higher maximum input voltage (16V vs. 7V) and equivalent dropout performance. MIC39301-2.5WU and MIC39301-2.5WU-TR provide higher current capability (3A vs. 1.5A) in the same package, suitable for applications requiring increased output current headroom.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout @ Rated Current	Iq (mA)	Package	Product Status	RoHS Status
LP3965ESX-2.5	Texas Instruments	2.5V	1.5A	7V	0.55V @ 1.5A	9	TO-263 (DDPAK-5)	Obsolete	Non-compliant
LP3965ESX-2.5/NOPB	Texas Instruments	2.5V	1.5A	7V	0.55V @ 1.5A	9	TO-263 (DDPAK-5)	Active	ROHS3 Compliant
LP3852ESX-2.5/NOPB	Texas Instruments	2.5V	1.5A	7V	0.38V @ 1.5A	3	TO-263 (DDPAK-5)	Active	ROHS3 Compliant
LP3855ESX-2.5/NOPB	Texas Instruments	2.5V	1.5A	7V	0.38V @ 1.5A	3	TO-263 (DDPAK-5)	Active	ROHS3 Compliant
LP3872ESX-2.5/NOPB	Texas Instruments	2.5V	1.5A	7V	0.55V @ 1.5A	5	TO-263 (DDPAK-5)	Active	ROHS3 Compliant
LP3875ESX-2.5/NOPB	Texas Instruments	2.5V	1.5A	7V	0.55V @ 1.5A	5	TO-263 (DDPAK-5)	Active	ROHS3 Compliant
LP3962ESX-2.5/NOPB	National Semiconductor	2.5V	1.5A	7V	0.55V @ 1.5A	9	TO-263 (DDPAK-5)	Active	Not specified
MIC39151-2.5WU	Microchip Technology	2.5V	1.5A	16V	0.5V @ 1.5A	Not specified	TO-263-5	Active	ROHS3 Compliant
MIC39151-2.5WU-TR	Microchip Technology	2.5V	1.5A	16V	0.5V @ 1.5A	Not specified	TO-263-5	Active	ROHS3 Compliant
MIC39301-2.5WU	Microchip Technology	2.5V	3A	16V	0.55V @ 3A	Not specified	TO-263-5	Active	ROHS3 Compliant
MIC39301-2.5WU-TR	Microchip Technology	2.5V	3A	16V	0.55V @ 3A	Not specified	TO-263-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Performance): Select LP3965ESX-2.5/NOPB as the primary direct substitute. This part maintains 100% electrical and mechanical compatibility with the obsolete LP3965ESX-2.5 while offering Active product status and ROHS3 compliance. Packaging availability in Tape & Reel format supports automated assembly processes.

For Improved Efficiency (Lower Power Dissipation): LP3852ESX-2.5/NOPB and LP3855ESX-2.5/NOPB are suitable when reduced quiescent current (3 mA vs. 9 mA) and lower dropout voltage (0.38V vs. 0.55V) provide system-level benefits. Both parts maintain identical output specifications and package compatibility with Active product status and ROHS3 compliance.

For Balanced Performance: LP3872ESX-2.5/NOPB and LP3875ESX-2.5/NOPB offer intermediate quiescent current (5 mA) with Active status and ROHS3 compliance, suitable for applications where moderate efficiency improvement is desired without design changes.

For Alternative Manufacturer Supply: LP3962ESX-2.5/NOPB (National Semiconductor) provides equivalent performance with Active product status, supporting supply chain diversification while maintaining identical electrical and package specifications.

For Higher Input Voltage Tolerance: MIC39151-2.5WU and MIC39151-2.5WU-TR (Microchip Technology) accept input voltages up to 16V compared to 7V maximum for Texas Instruments parts, suitable for applications with higher input voltage requirements. Both maintain 1.5A output current, TO-263-5 package compatibility, and ROHS3 compliance.

For Increased Output Current Capability: MIC39301-2.5WU and MIC39301-2.5WU-TR deliver 3A output current in the same TO-263-5 package with 16V input voltage rating, appropriate for applications requiring higher current headroom or thermal margin.

Frequently Asked Questions (FAQ)

Q: Can LP3965ESX-2.5/NOPB be used as a direct drop-in replacement for the obsolete LP3965ESX-2.5?

A: Yes. LP3965ESX-2.5/NOPB is the direct equivalent with identical electrical specifications (2.5V output, 1.5A current, 0.55V dropout), package type (TO-263 DDPAK-5), and operating temperature range (-40°C to 125°C). The primary differences are Active product status and ROHS3 compliance. No circuit modifications are required.

Q: What is the difference between LP3852ESX-2.5/NOPB and LP3965ESX-2.5/NOPB?

A: Both deliver 2.5V at 1.5A in TO-263 package. LP3852ESX-2.5/NOPB features lower quiescent current (3 mA vs. 9 mA) and reduced dropout voltage (0.38V vs. 0.55V), resulting in lower power dissipation. Electrical compatibility is maintained; the choice depends on thermal and efficiency requirements.

Q: Are Microchip MIC39151 and MIC39301 parts compatible with the LP3965ESX-2.5 footprint?

A: Yes. Both Microchip parts use TO-263-5 package, which is mechanically and electrically compatible with TO-263 (DDPAK-5). Pin assignments and functional behavior align with the original part. MIC39151 maintains 1.5A output current; MIC39301 provides 3A output current.

Q: What is the advantage of MIC39151-2.5WU-TR over LP3965ESX-2.5/NOPB?

A: MIC39151-2.5WU-TR accepts input voltages up to 16V compared to 7V for the Texas Instruments part, providing greater input voltage margin. Both deliver 2.5V at 1.5A with equivalent dropout performance and package compatibility. Selection depends on input voltage requirements.

Q: Can MIC39301-2.5WU be used in place of LP3965ESX-2.5?

A: Yes, with consideration for increased current capability. MIC39301 delivers 3A output current versus 1.5A for the original part, in the same TO-263-5 package. This provides thermal margin and supports higher load currents. All other specifications (2.5V output, input voltage to 16V, operating temperature) are compatible.

Q: What packaging formats are available for these substitute parts?

A: Texas Instruments LP series parts are available in Tape & Reel (TR) format. National Semiconductor LP3962ESX-2.5/NOPB is available in Bulk. Microchip MIC39151 and MIC39301 are available in Tube and Cut Tape (CT) formats. Verify packaging requirements for your assembly process.

Q: Are all substitute parts RoHS compliant?

A: Texas Instruments LP3852, LP3855, LP3872, LP3875, and LP3965 (with /NOPB suffix) are ROHS3 compliant. LP3962ESX-2.5/NOPB RoHS status is not specified. Microchip MIC39151 and MIC39301 parts are ROHS3 compliant. Verify compliance requirements for your application.

Q: Which substitute part offers the best efficiency for battery-powered applications?

A: LP3852ESX-2.5/NOPB and LP3855ESX-2.5/NOPB provide the lowest quiescent current at 3 mA with reduced dropout voltage of 0.38V, minimizing power dissipation in low-load conditions. These are optimal for battery-powered or energy-constrained applications.

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