LP3965ES-2.5 Equivalent & Substitute Parts

Part Overview

The LP3965ES-2.5 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed 2.5V output at 1.5A maximum current in a TO-263 (DDPAK-5) surface mount package. The device features integrated protection against overcurrent, overtemperature, and short circuit conditions, with an operating range of -40°C to 125°C.

The main part (LP3965ES-2.5) carries a Last Time Buy status, indicating discontinued production. Equivalent and substitute parts are necessary to maintain design continuity and ensure long-term component availability for new production runs and field replacements.

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	TO-263 (DDPAK-5)
Output Configuration	Positive Fixed
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts are grouped into three categories based on electrical and mechanical compatibility:

Direct Equivalent (Same Manufacturer, Same Specifications): LP3965ES-2.5/NOPB is the direct equivalent with identical electrical specifications and Active product status, differing only in packaging designation (NOPB suffix).

Parametric Equivalents (Texas Instruments LP Series): LP3852ES-2.5/NOPB, LP3855ES-2.5/NOPB, LP3872ES-2.5/NOPB, LP3875ES-2.5/NOPB, and LP3962ES-2.5/NOPB maintain the critical parameters: 2.5V fixed output, 1.5A output current, TO-263 package, and -40°C to 125°C operating range. These parts differ in quiescent current, dropout voltage, and PSRR specifications, but remain functionally compatible for the same application space.

Manufacturer-Recommended Alternatives (Microchip MIC Series): MIC39151-2.5WU and MIC39151-2.5WU-TR provide equivalent 2.5V/1.5A regulation in TO-263-5 packaging. MIC39301-2.5WU and MIC39301-2.5WU-TR offer higher output current (3A) in the same package, suitable for applications requiring additional current margin.

All substitute parts share the same output voltage, package family, surface mount technology, and core protection features. Substitution is valid when the application requirements do not exceed the electrical limits of the selected alternative.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout @ Rated Current	Iq (mA)	Package	Status
LP3965ES-2.5	Texas Instruments	2.5V	1.5A	7V	0.55V @ 1.5A	9	TO-263 (DDPAK-5)	Last Time Buy
LP3965ES-2.5/NOPB	Texas Instruments	2.5V	1.5A	7V	0.55V @ 1.5A	9	TO-263 (DDPAK-5)	Active
LP3852ES-2.5/NOPB	Texas Instruments	2.5V	1.5A	7V	0.38V @ 1.5A	3	TO-263 (DDPAK-5)	Active
LP3855ES-2.5/NOPB	Texas Instruments	2.5V	1.5A	7V	0.38V @ 1.5A	3	TO-263 (DDPAK-5)	Active
LP3872ES-2.5/NOPB	Texas Instruments	2.5V	1.5A	7V	0.55V @ 1.5A	5	TO-263 (DDPAK-5)	Active
LP3875ES-2.5/NOPB	Texas Instruments	2.5V	1.5A	7V	0.55V @ 1.5A	5	TO-263 (DDPAK-5)	Active
LP3962ES-2.5/NOPB	National Semiconductor	2.5V	1.5A	7V	0.55V @ 1.5A	9	TO-263 (DDPAK-5)	Active
MIC39151-2.5WU	Microchip Technology	2.5V	1.5A	16V	0.5V @ 1.5A	—	TO-263-5	Active
MIC39151-2.5WU-TR	Microchip Technology	2.5V	1.5A	16V	0.5V @ 1.5A	—	TO-263-5	Active
MIC39301-2.5WU	Microchip Technology	2.5V	3A	16V	0.55V @ 3A	—	TO-263-5	Active
MIC39301-2.5WU-TR	Microchip Technology	2.5V	3A	16V	0.55V @ 3A	—	TO-263-5	Active

Engineering Selection Recommendations

Primary Recommendation: LP3965ES-2.5/NOPB This part is the direct equivalent with identical electrical specifications and Active product status. It is the preferred choice for direct replacement in existing designs and new production runs.

Secondary Recommendations (Texas Instruments LP Series): LP3852ES-2.5/NOPB and LP3855ES-2.5/NOPB offer improved performance characteristics with lower quiescent current (3 mA vs. 9 mA) and reduced dropout voltage (0.38V vs. 0.55V). These are suitable for applications where power efficiency and thermal management are critical. Both parts maintain Active status and full ROHS3 compliance.

LP3872ES-2.5/NOPB and LP3875ES-2.5/NOPB provide intermediate quiescent current (5 mA) while maintaining the same dropout voltage as the original part. LP3872ES-2.5/NOPB carries REACH Affected status; verify compliance requirements before selection.

LP3962ES-2.5/NOPB (National Semiconductor) matches the original specifications exactly and maintains Active status with high inventory availability (10,250 pcs).

Alternative Recommendation (Microchip MIC Series): MIC39151-2.5WU and MIC39151-2.5WU-TR are functionally equivalent with identical 2.5V/1.5A ratings. These parts support higher input voltage (16V vs. 7V) and include reverse polarity protection. MIC39151-2.5WU-TR is supplied in Tape & Reel format for automated assembly.

MIC39301-2.5WU and MIC39301-2.5WU-TR provide 3A output current in the same package, offering current margin for applications approaching the 1.5A limit. These are suitable for designs requiring future current scaling without package change.

All recommended parts are ROHS3 compliant and operate across the full -40°C to 125°C temperature range.

Frequently Asked Questions (FAQ)

Q: Can LP3965ES-2.5/NOPB be used as a direct replacement for LP3965ES-2.5? A: Yes. LP3965ES-2.5/NOPB is the direct equivalent with identical electrical specifications. The NOPB suffix indicates lead-free (no lead) and halogen-free packaging, which is the current manufacturing standard. Both parts are functionally interchangeable.

Q: What is the difference between LP3852ES-2.5/NOPB and LP3965ES-2.5? A: Both deliver 2.5V at 1.5A in TO-263 packaging. LP3852ES-2.5/NOPB has lower quiescent current (3 mA vs. 9 mA) and reduced dropout voltage (0.38V vs. 0.55V), resulting in improved efficiency and lower heat dissipation. The trade-off is slightly different internal architecture. Both are suitable for the same application space.

Q: Why do MIC39151 and MIC39301 have different output currents? A: MIC39151-2.5WU is rated for 1.5A output, matching the original LP3965ES-2.5 specification. MIC39301-2.5WU is rated for 3A output in the same TO-263-5 package. The MIC39301 series is suitable for applications requiring higher current capacity without changing the physical footprint.

Q: What is the significance of the -TR suffix on Microchip parts? A: The -TR suffix indicates Tape & Reel packaging format, suitable for automated pick-and-place assembly. MIC39151-2.5WU-TR and MIC39301-2.5WU-TR are identical to their non-TR counterparts electrically but differ in packaging presentation. Select -TR variants for high-volume production; select non-TR (Tube) variants for lower-volume or manual assembly scenarios.

Q: Can I use MIC39301-2.5WU (3A) in place of LP3965ES-2.5 (1.5A)? A: Yes. The MIC39301-2.5WU is a superset replacement with higher current capability. It maintains the same 2.5V output voltage, TO-263-5 package footprint, and operating temperature range. The higher current rating does not affect operation at 1.5A or below. This substitution is valid for designs requiring future current scaling.

Q: Are all substitute parts ROHS3 compliant? A: All listed substitute parts are ROHS3 compliant except where noted. LP3872ES-2.5/NOPB carries REACH Affected status; verify regulatory compliance requirements for your specific application and region before final selection.

Q: What is the maximum input voltage for each substitute? A: Texas Instruments LP series parts (LP3965ES-2.5/NOPB, LP3852ES-2.5/NOPB, LP3855ES-2.5/NOPB, LP3872ES-2.5/NOPB, LP3875ES-2.5/NOPB, LP3962ES-2.5/NOPB) support 7V maximum input. Microchip MIC series parts (MIC39151, MIC39301) support 16V maximum input. Select MIC series parts for applications with higher input voltage requirements.

Q: Do all parts include the same protection features? A: Texas Instruments and National Semiconductor parts include overcurrent, overtemperature, and short circuit protection. Microchip MIC series parts add reverse polarity protection. All parts meet the core protection requirements of the original LP3965ES-2.5.

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