LP3964ES-1.8 Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The LP3964ES-1.8 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.8V output applications with 800mA current capacity. This Surface Mount device in TO-263 (DDPAK-5) packaging provides regulated power with integrated protection features including over-current, over-temperature, and short-circuit protection. The main part is currently in Last Time Buy status, making identification of equivalent and substitute parts essential for ongoing design support and procurement planning.

Key Parameters

Parameter	Value
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.8V
Voltage - Input (Max)	7V
Current - Output	800mA
Voltage Dropout (Max)	0.35V @ 800mA
Operating Temperature	-40°C ~ 125°C
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Protection Features	Over Current, Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LP3964ES-1.8 is determined by strict alignment of the following critical parameters:

Output voltage: 1.8V fixed
Maximum output current: 800mA
Maximum input voltage: 7V
Maximum dropout voltage: 0.35V @ 800mA
Package type: TO-263 (DDPAK-5)
Operating temperature range: -40°C ~ 125°C
Protection features: Over Current, Over Temperature, Short Circuit
Control features: Enable function

All identified substitute parts meet these electrical and mechanical specifications. Substitutes are classified as direct manufacturer equivalents or parametric equivalents based on part number lineage and product status.

Parameter Comparison

Parameter	LP3964ES-1.8	LP3964ES-1.8/NOPB	LP3871ES-1.8/NOPB	LP3961ES-1.8/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	National Semiconductor
Output Configuration	Positive	Positive	Positive	Positive
Output Type	Fixed	Fixed	Fixed	Fixed
Voltage - Output (Min/Fixed)	1.8V	1.8V	1.8V	1.8V
Voltage - Input (Max)	7V	7V	7V	7V
Current - Output	800mA	800mA	800mA	800mA
Voltage Dropout (Max)	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA
Current - Quiescent (Iq)	9 mA	9 mA	5 mA	9 mA
Current - Supply (Max)	15 mA	15 mA	15 mA	15 mA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)	TO-263-6, D2PAK (5 Leads + Tab)	TO-263-6, D2PAK (5 Leads + Tab)	TO-263-6, D2PAK (5 Leads + Tab)
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified
Product Status	Last Time Buy	Active	Active	Active

Engineering Selection Recommendations

LP3964ES-1.8/NOPB is the direct manufacturer equivalent with identical electrical specifications and active product status. This part is recommended as the primary substitute for new designs and ongoing procurement due to its active status and full ROHS3 compliance.

LP3871ES-1.8/NOPB is a parametric equivalent offering lower quiescent current (5 mA versus 9 mA) while maintaining all critical electrical parameters. This part is suitable for applications where reduced standby power consumption is beneficial. Active product status and ROHS3 compliance support long-term availability.

LP3961ES-1.8/NOPB from National Semiconductor meets all specified electrical and mechanical parameters. This part maintains compatibility with the original design while offering an alternative manufacturer source. Product status is active; however, RoHS compliance status is not specified in available documentation.

All three substitute parts are pin-compatible in TO-263 (DDPAK-5) packaging and require no PCB layout modifications.

Frequently Asked Questions (FAQ)

Q: Can LP3964ES-1.8/NOPB be used as a direct replacement for LP3964ES-1.8?

A: Yes. LP3964ES-1.8/NOPB is the direct manufacturer equivalent with identical electrical specifications, output voltage, current rating, dropout voltage, and protection features. The primary difference is active product status versus Last Time Buy status.

Q: What is the difference between LP3871ES-1.8/NOPB and the original LP3964ES-1.8?

A: LP3871ES-1.8/NOPB has lower quiescent current (5 mA versus 9 mA). All other critical parameters including output voltage, current capacity, dropout voltage, operating temperature range, and package type are identical. This makes it suitable for power-sensitive applications.

Q: Are all substitute parts pin-compatible?

A: Yes. All substitute parts use the TO-263 (DDPAK-5) package with identical pinout, requiring no PCB modifications for substitution.

Q: What is the significance of the /NOPB designation?

A: The /NOPB suffix indicates "No Plumbum" (lead-free) packaging, confirming RoHS3 compliance for the LP3964ES-1.8/NOPB variant.

Q: Can LP3961ES-1.8/NOPB from National Semiconductor be used interchangeably?

A: Yes. LP3961ES-1.8/NOPB meets all specified electrical parameters and package requirements. It provides an alternative manufacturer source while maintaining full electrical compatibility.

Q: Why is the original LP3964ES-1.8 in Last Time Buy status?

A: Last Time Buy status indicates the manufacturer is discontinuing this specific part number. Substitute parts with active status ensure continued availability for future production and design iterations.

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