LP3965ESX-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3965ESX-ADJ is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. It delivers 1.5A output current in a TO-263 (DDPAK-5) surface mount package. The device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Adjustable
Current - Output	1.5A
Voltage - Input (Max)	7V
Voltage - Output (Min/Fixed)	1.216V
Voltage - Output (Max)	5.1V
Voltage Dropout (Max)	0.55V @ 1.5A
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Operating Temperature	-40°C ~ 125°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the LP3965ESX-ADJ are identified based on the following critical parameters:

Output configuration (Positive)
Output type (Adjustable)
Package compatibility (TO-263-6 / D2PAK)
Operating temperature range (-40°C ~ 125°C)
Surface mount mounting type
Output current capability (minimum 1.5A required for direct replacement)
Input voltage rating (minimum 7V)
Adjustable output voltage range (minimum 1.216V to 5.1V)

Two substitute parts are identified: LP3965ESX-ADJ/NOPB (parametric equivalent from Texas Instruments) and MIC29372WU (manufacturer-recommended alternative from Microchip Technology).

Parameter Comparison

Parameter	LP3965ESX-ADJ	LP3965ESX-ADJ/NOPB	MIC29372WU
Manufacturer	Texas Instruments	Texas Instruments	Microchip Technology
Output Configuration	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable
Current - Output	1.5A	1.5A	750mA
Voltage - Input (Max)	7V	7V	26V
Voltage - Output (Min/Fixed)	1.216V	1.216V	1.24V
Voltage - Output (Max)	5.1V	5.1V	26V
Voltage Dropout (Max)	0.55V @ 1.5A	0.55V @ 1.5A	0.75V @ 750mA
Current - Quiescent (Iq)	9 mA	9 mA	300 µA
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)	TO-263-6, D2PAK (5 Leads + Tab)	TO-263-6, D2PAK (5 Leads + Tab)
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Control Features	Enable	Enable	Enable
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature

Engineering Selection Recommendations

LP3965ESX-ADJ/NOPB is the primary parametric equivalent. It maintains identical electrical specifications and package configuration as the obsolete LP3965ESX-ADJ while offering active product status and ROHS3 compliance. This part is the direct replacement for applications requiring the full 1.5A output current and 0.55V maximum dropout specification.

MIC29372WU is a manufacturer-recommended alternative from Microchip Technology. It shares the same package footprint and adjustable output configuration. However, it differs in output current capacity (750mA versus 1.5A) and input voltage rating (26V maximum versus 7V maximum). This part is suitable only for applications where the reduced output current and higher input voltage rating do not conflict with design requirements. The MIC29372WU offers superior quiescent current performance (300 µA versus 9 mA) and extended input voltage range.

Both substitute parts are ROHS3 compliant and maintain the required operating temperature range of -40°C to 125°C.

Frequently Asked Questions (FAQ)

Q: Can LP3965ESX-ADJ/NOPB be used as a direct replacement for LP3965ESX-ADJ?

A: Yes. LP3965ESX-ADJ/NOPB is a parametric equivalent with identical electrical specifications, package configuration, and pin assignment. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 compliant versus non-compliant).

Q: What are the limitations of using MIC29372WU as a substitute?

A: MIC29372WU has a reduced output current rating of 750mA compared to the 1.5A specification of LP3965ESX-ADJ. It is not suitable for applications requiring the full 1.5A output current. Additionally, MIC29372WU has a higher maximum dropout voltage (0.75V @ 750mA) and higher quiescent current (300 µA).

Q: Are the package footprints identical for all three parts?

A: Yes. All three parts use the TO-263-6 / D2PAK (5 Leads + Tab) package, ensuring mechanical compatibility on the PCB.

Q: Which substitute part should be selected for new designs?

A: LP3965ESX-ADJ/NOPB is recommended for new designs requiring the full 1.5A output current specification. MIC29372WU is an alternative only if the application can operate within its reduced current rating and the extended input voltage range is beneficial.

Q: Do the substitute parts maintain the same adjustable output voltage range?

A: LP3965ESX-ADJ/NOPB maintains the identical range (1.216V to 5.1V). MIC29372WU offers an extended range (1.24V to 26V), which may require circuit redesign if the application depends on the original output voltage limits.

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