LP3961ES-1.8 Linear Voltage Regulator — Equivalent & Substitute Parts

Part Overview

The LP3961ES-1.8 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive 1.8V output at 800mA with a maximum dropout voltage of 0.35V, housed in a TO-263 (DDPAK-5) surface mount package. The main part is currently in Last Time Buy status with 3,680 units in stock. Alternative equivalent parts are available from the same manufacturer and related sources to support continued design implementation and production requirements.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LP3961ES-1.8
Category	Power Management (PMIC)
Output Voltage (Fixed)	1.8V
Output Current	800mA
Input Voltage (Max)	7V
Dropout Voltage (Max)	0.35V @ 800mA
Quiescent Current	9mA
Operating Temperature Range	-40°C to 125°C
Package Type	TO-263-6 (DDPAK-5)
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Equivalent and substitute parts for the LP3961ES-1.8 are determined by strict alignment of the following critical parameters:

Fixed output voltage of 1.8V
Output current rating of 800mA
Maximum input voltage of 7V
Dropout voltage specification of 0.35V @ 800mA
TO-263 (DDPAK-5) package configuration
Surface mount technology
Operating temperature range of -40°C to 125°C
Enable control feature
Over Current, Over Temperature, and Short Circuit protection

Parts meeting all these criteria are classified as direct equivalents or parametric equivalents. Substitution is valid when electrical performance, thermal characteristics, and mechanical package compatibility remain unchanged.

Parameter Comparison

Parameter	LP3961ES-1.8	LP3961ES-1.8/NOPB	LP3871ES-1.8/NOPB	LP3964ES-1.8/NOPB
Manufacturer	Texas Instruments	National Semiconductor	Texas Instruments	Texas Instruments
Output Voltage	1.8V	1.8V	1.8V	1.8V
Output Current	800mA	800mA	800mA	800mA
Input Voltage (Max)	7V	7V	7V	7V
Dropout Voltage (Max)	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA
Quiescent Current	9mA	9mA	5mA	9mA
Supply Current (Max)	15mA	15mA	15mA	15mA
PSRR	—	—	73dB ~ 57dB (120Hz)	—
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Package	TO-263-6 (DDPAK-5)	TO-263-6 (DDPAK-5)	TO-263-6 (DDPAK-5)	TO-263-6 (DDPAK-5)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
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
Control Features	Enable	Enable	Enable	Enable
RoHS Status	ROHS3 Compliant	—	ROHS3 Compliant	ROHS3 Compliant
Product Status	Last Time Buy	Active	Active	Active

Engineering Selection Recommendations

LP3961ES-1.8/NOPB (National Semiconductor): This direct equivalent maintains identical electrical specifications and package configuration. It is currently in Active product status with 740 units available. Selection is appropriate for applications requiring immediate availability and equivalent performance characteristics.

LP3871ES-1.8/NOPB (Texas Instruments): This parametric equivalent delivers the same output voltage, current, and package specifications. It features a lower quiescent current of 5mA compared to 9mA in the main part, and includes documented PSRR performance of 73dB to 57dB at 120Hz. It is in Active product status with 1,344 units in stock. This part is suitable for designs where reduced quiescent current consumption is beneficial.

LP3964ES-1.8/NOPB (Texas Instruments): This parametric equivalent matches all critical electrical and mechanical parameters of the main part. It is in Active product status with 784 units available. All substitute parts carry ROHS3 compliance and appropriate regulatory certifications (ECCN EAR99, REACH Unaffected).

Frequently Asked Questions (FAQ)

Q: Can LP3961ES-1.8/NOPB be used as a direct replacement for LP3961ES-1.8?

A: Yes. Both parts share identical output voltage (1.8V), output current (800mA), dropout voltage (0.35V @ 800mA), operating temperature range (-40°C to 125°C), and TO-263 (DDPAK-5) package configuration. The /NOPB designation indicates lead-free plating, which does not affect electrical compatibility.

Q: What is the difference between LP3871ES-1.8/NOPB and the main part?

A: The LP3871ES-1.8/NOPB maintains equivalent output specifications and package type. The primary difference is quiescent current: 5mA versus 9mA in the main part. Additionally, the LP3871 provides documented PSRR performance (73dB to 57dB at 120Hz), whereas PSRR is not specified for the main part. Both are suitable for the same circuit applications.

Q: Are all substitute parts available in the same package?

A: Yes. All listed substitute parts use the TO-263-6 (DDPAK-5) surface mount package, ensuring mechanical and thermal compatibility with existing PCB designs.

Q: What compliance certifications apply to substitute parts?

A: All substitute parts are ROHS3 compliant, REACH Unaffected, and classified under ECCN EAR99. Moisture Sensitivity Level (MSL) is rated at 3 (168 Hours) for parts with specified MSL data.

Q: Why is the main part listed as Last Time Buy?

A: Last Time Buy status indicates the manufacturer is discontinuing production. Substitute parts in Active status provide continuity for ongoing production and design requirements.

Q: Can these parts be used interchangeably in existing designs?

A: Yes, provided the circuit design does not depend on specifications not listed in the parameter comparison table. All parts deliver 1.8V at 800mA with identical dropout voltage and protection features in the same package configuration.

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