LP3964ESX-ADJ Linear Voltage Regulator

Part Overview

The LP3964ESX-ADJ is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device provides positive adjustable output regulation with 800mA current capability in a TO-263 (DDPAK-5) surface mount package. The part is currently marked as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity. The LP3964ESX-ADJ/NOPB variant from National Semiconductor serves as a direct functional equivalent with identical electrical specifications and package configuration.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP3964ESX-ADJ
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Output Configuration	Positive
Output Type	Adjustable
Voltage - Input (Max)	7V
Voltage - Output (Min/Fixed)	1.216V
Voltage - Output (Max)	5.1V
Current - Output	800mA
Voltage Dropout (Max)	0.35V @ 800mA
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the LP3964ESX-ADJ is determined by strict equivalence across the following critical parameters:

Output configuration (Positive)
Output type (Adjustable)
Voltage specifications (Input Max: 7V, Output Min: 1.216V, Output Max: 5.1V)
Current rating (800mA output)
Voltage dropout performance (0.35V @ 800mA)
Package type (TO-263-6, D2PAK with 5 Leads + Tab)
Protection features (Over Current, Over Temperature, Short Circuit)
Control features (Enable function)
Operating temperature range (-40°C ~ 125°C)

The LP3964ESX-ADJ/NOPB from National Semiconductor meets all these criteria and is classified as a direct manufacturer substitute with identical electrical and mechanical specifications.

Parameter Comparison

Parameter	LP3964ESX-ADJ (TI)	LP3964ESX-ADJ/NOPB (NSM)
Manufacturer	Texas Instruments	National Semiconductor
Output Configuration	Positive	Positive
Output Type	Adjustable	Adjustable
Number of Regulators	1	1
Voltage - Input (Max)	7V	7V
Voltage - Output (Min/Fixed)	1.216V	1.216V
Voltage - Output (Max)	5.1V	5.1V
Voltage Dropout (Max)	0.35V @ 800mA	0.35V @ 800mA
Current - Output	800mA	800mA
Current - Quiescent (Iq)	9 mA	9 mA
Current - Supply (Max)	15 mA	15 mA
Control Features	Enable	Enable
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)	TO-263-6, D2PAK (5 Leads + Tab)
Supplier Device Package	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)
Product Status	Obsolete	Active
ECCN	EAR99	EAR99
HTSUS	8542.39.0001	8542.39.0001

Engineering Selection Recommendations

The LP3964ESX-ADJ/NOPB from National Semiconductor is the designated substitute for the obsolete LP3964ESX-ADJ from Texas Instruments. Both parts share identical electrical specifications, package configuration, and functional characteristics. The primary distinction is product status: the original part is obsolete while the substitute remains active in production.

Selection of the LP3964ESX-ADJ/NOPB is supported by:

Complete electrical parameter equivalence across all voltage, current, and thermal specifications
Identical TO-263 (DDPAK-5) package footprint and pinout
Matching protection and control feature sets
Equivalent export classification (ECCN: EAR99) and tariff codes (HTSUS: 8542.39.0001)
Active product status ensuring continued availability and supply chain reliability

Frequently Asked Questions (FAQ)

Q: Can the LP3964ESX-ADJ/NOPB be used as a direct replacement for the LP3964ESX-ADJ?

A: Yes. Both parts are electrically and mechanically identical. The LP3964ESX-ADJ/NOPB maintains the same output voltage range (1.216V to 5.1V), current rating (800mA), dropout voltage (0.35V @ 800mA), and package configuration (TO-263 DDPAK-5). No circuit modifications are required.

Q: What is the difference between the two part numbers?

A: The primary difference is manufacturer and product status. The LP3964ESX-ADJ is from Texas Instruments and is obsolete. The LP3964ESX-ADJ/NOPB is from National Semiconductor and remains active. The "/NOPB" suffix indicates lead-free (Pb-free) packaging. Electrical specifications are identical.

Q: Are there any compliance or certification differences?

A: Both parts share the same export classification (ECCN: EAR99) and tariff code (HTSUS: 8542.39.0001). The original part is RoHS non-compliant, while compliance status for the substitute is not specified in the provided data.

Q: What is the TO-263 (DDPAK-5) package?

A: TO-263 is a surface mount package also known as D2PAK, consisting of 5 leads plus a thermal tab. This package is standard for linear regulators requiring moderate current handling and thermal dissipation. Pin compatibility is maintained between the two parts.

Q: Can this regulator be used in new designs?

A: The LP3964ESX-ADJ/NOPB is the appropriate choice for new designs, as it maintains active product status and ensures long-term supply availability. The original LP3964ESX-ADJ should not be selected for new designs due to its obsolete status.

Q: What protection features are included?

A: Both parts include over-current protection, over-temperature protection, and short-circuit protection. These features are active across the full operating temperature range of -40°C to 125°C.

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