LP3964ES-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3964ES-ADJ is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This Surface Mount device delivers 800mA output current in a TO-263 (DDPAK-5) package and operates across -40°C to 125°C. The part is currently in Last Time Buy status, making identification of equivalent and substitute components essential for design continuity and procurement planning.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LP3964ES-ADJ
Category	Power Management (PMIC)
Output Configuration	Positive Adjustable
Current - Output	800mA
Voltage - Input (Max)	7V
Voltage - Output (Min/Fixed)	1.216V
Voltage - Output (Max)	5.1V
Voltage Dropout (Max)	0.35V @ 800mA
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Operating Temperature	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitute parts for the LP3964ES-ADJ are identified based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Output Configuration: Positive Adjustable
Package Type: TO-263 / D2PAK (5 Leads + Tab)
Mounting Type: Surface Mount
Operating Temperature Range: -40°C ~ 125°C
Output Voltage Range: Adjustable positive output
RoHS3 Compliance

Substitution Logic: Direct equivalents maintain identical electrical specifications and packaging. Manufacturer-recommended substitutes may have enhanced specifications (higher current capability, improved dropout voltage, or automotive qualification) while maintaining pin-compatible packaging and adjustable output configuration. All substitute parts must support the same output voltage adjustment range and thermal operating window.

Parameter Comparison

Parameter	LP3964ES-ADJ	LP3964ES-ADJ/NOPB	NCV5662DSADJR4G
Manufacturer	Texas Instruments	Texas Instruments	onsemi
Output Configuration	Positive Adjustable	Positive Adjustable	Positive Adjustable
Current - Output	800mA	800mA	2A
Voltage - Input (Max)	7V	7V	9V
Voltage - Output (Min/Fixed)	1.216V	1.216V	0.9V
Voltage - Output (Max)	5.1V	5.1V	7.7V
Voltage Dropout (Max)	0.35V @ 800mA	0.35V @ 800mA	1.3V @ 2A
Current - Quiescent (Iq)	9 mA	9 mA	3 mA
Package / Case	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Last Time Buy	Active	Active
Automotive Grade	No	No	Yes (AEC-Q100)

Engineering Selection Recommendations

LP3964ES-ADJ/NOPB (Texas Instruments): This direct equivalent maintains identical electrical specifications and packaging. It is the primary substitute for the LP3964ES-ADJ and carries Active product status, ensuring continued availability and support. Selection of this part preserves all original design parameters without modification.

NCV5662DSADJR4G (onsemi): This manufacturer-recommended substitute provides enhanced specifications suitable for applications requiring higher current delivery or improved thermal performance. The part delivers 2A output current versus 800mA, supports higher input voltage (9V maximum), and features lower quiescent current (3mA). It maintains TO-263 / D2PAK packaging compatibility and carries AEC-Q100 automotive qualification. The NCV5662DSADJR4G is appropriate for designs where increased current capacity or automotive-grade reliability is beneficial, provided the application can accommodate the different dropout voltage characteristic (1.3V @ 2A).

Both substitute parts maintain ROHS3 compliance and the required operating temperature range. Selection between them depends on application current requirements and whether automotive qualification is necessary.

Frequently Asked Questions (FAQ)

Q: Can LP3964ES-ADJ/NOPB be used as a direct replacement for LP3964ES-ADJ?

A: Yes. The LP3964ES-ADJ/NOPB is a direct equivalent with identical electrical specifications, output current rating (800mA), voltage parameters, and TO-263 packaging. The primary difference is product status: LP3964ES-ADJ/NOPB is Active, while the original is Last Time Buy.

Q: What are the key differences between LP3964ES-ADJ and NCV5662DSADJR4G?

A: The NCV5662DSADJR4G provides higher output current (2A versus 800mA), supports higher input voltage (9V versus 7V maximum), and features lower quiescent current (3mA versus 9mA). However, it has higher dropout voltage (1.3V @ 2A versus 0.35V @ 800mA). Both maintain TO-263 packaging and adjustable positive output configuration.

Q: Are all substitute parts pin-compatible?

A: Yes. All listed parts use TO-263 / D2PAK (5 Leads + Tab) packaging with identical pinout, enabling direct PCB replacement without layout modification.

Q: Can NCV5662DSADJR4G be used in applications designed for 800mA output?

A: Yes. The NCV5662DSADJR4G supports the same adjustable output voltage range and can deliver 800mA without exceeding its 2A rating. The higher current capability provides design margin and does not create incompatibility.

Q: What compliance certifications apply to these parts?

A: All three parts are ROHS3 compliant. The NCV5662DSADJR4G additionally carries AEC-Q100 automotive qualification, making it suitable for automotive applications requiring this certification.

Q: How does the adjustable output voltage range compare across these parts?

A: LP3964ES-ADJ and LP3964ES-ADJ/NOPB support 1.216V to 5.1V adjustable output. NCV5662DSADJR4G supports 0.9V to 7.7V adjustable output, providing a wider adjustment range for applications requiring lower minimum or higher maximum output voltages.

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