LP3963ESX-2.5/NOPB Equivalent & Substitute Parts

Part Overview

The LP3963ESX-2.5/NOPB is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This positive fixed output regulator delivers 3A at 2.5V and operates across an input voltage range up to 7V with a maximum dropout voltage of 1.2V at full load. The device is actively produced and widely used in power supply applications requiring stable 2.5V regulation with integrated protection features including over-current, over-temperature, and short-circuit protection. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter set.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP3963ESX-2.5/NOPB
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	2.5V
Output Current	3A
Input Voltage (Max)	7V
Dropout Voltage (Max)	1.2V @ 3A
Quiescent Current	9 mA
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the LP3963ESX-2.5/NOPB are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

Output voltage: 2.5V fixed
Output current capability: 3A
Input voltage maximum: 7V
Package type: TO-263 (DDPAK-5)
Output configuration: Positive
Number of regulators: 1
Protection features: Over Current, Over Temperature, Short Circuit
Operating temperature range: -40°C ~ 125°C
Control features: Enable function
Mounting type: Surface Mount

Allowable Variation Parameters:

Dropout voltage: 0.6V to 1.2V @ 3A
Quiescent current: 4 mA to 9 mA
Supply current (max): 10 mA to 15 mA
PSRR: Present or not specified
Packaging format: Tape & Reel or Bulk
Manufacturer: Texas Instruments or National Semiconductor

All identified substitute parts maintain identical electrical output specifications and mechanical compatibility while operating within the allowable parameter ranges.

Parameter Comparison

Parameter	LP3963ESX-2.5/NOPB	LP3853ESX-2.5/NOPB	LP3856ESX-2.5/NOPB	LP3876ESX-2.5/NOPB	LP3966ESX-2.5/NOPB
Manufacturer	Texas Instruments	National Semiconductor	Texas Instruments	Texas Instruments	Texas Instruments
Output Voltage (Fixed)	2.5V	2.5V	2.5V	2.5V	2.5V
Output Current	3A	3A	3A	3A	3A
Input Voltage (Max)	7V	7V	7V	7V	7V
Dropout Voltage (Max)	1.2V @ 3A	0.6V @ 3A	0.6V @ 3A	1.2V @ 3A	1.2V @ 3A
Quiescent Current	9 mA	4 mA	4 mA	5 mA	9 mA
Supply Current (Max)	15 mA	10 mA	10 mA	15 mA	15 mA
PSRR	Not specified	73dB ~ 57dB (120Hz)	73dB ~ 57dB (120Hz)	Not specified	Not specified
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)	TO-263-6, D2PAK (5 Leads + Tab)
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
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	Over Current, Over Temperature, Short Circuit
Product Status	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All identified substitute parts maintain active product status and are suitable for direct replacement in applications requiring a 2.5V, 3A linear voltage regulator in TO-263 packaging. Selection between equivalent parts should be based on the following considerations:

Dropout Voltage Performance: LP3853ESX-2.5/NOPB and LP3856ESX-2.5/NOPB offer reduced dropout voltage of 0.6V @ 3A compared to 1.2V @ 3A for LP3963ESX-2.5/NOPB, LP3876ESX-2.5/NOPB, and LP3966ESX-2.5/NOPB. Lower dropout voltage reduces power dissipation in applications with limited input voltage headroom.

Quiescent Current: LP3853ESX-2.5/NOPB and LP3856ESX-2.5/NOPB feature lower quiescent current at 4 mA, while LP3963ESX-2.5/NOPB and LP3966ESX-2.5/NOPB operate at 9 mA. LP3876ESX-2.5/NOPB operates at 5 mA. Lower quiescent current reduces standby power consumption.

PSRR Specification: LP3853ESX-2.5/NOPB and LP3856ESX-2.5/NOPB provide documented Power Supply Rejection Ratio of 73dB ~ 57dB (120Hz), offering superior noise rejection compared to parts without specified PSRR.

Compliance: All substitute parts maintain ROHS3 compliance where specified. LP3963ESX-2.5/NOPB, LP3856ESX-2.5/NOPB, LP3876ESX-2.5/NOPB, and LP3966ESX-2.5/NOPB are explicitly ROHS3 compliant.

Packaging Format: LP3963ESX-2.5/NOPB, LP3856ESX-2.5/NOPB, LP3876ESX-2.5/NOPB, and LP3966ESX-2.5/NOPB are supplied in Tape & Reel format. LP3853ESX-2.5/NOPB is supplied in Bulk packaging.

Frequently Asked Questions (FAQ)

Q: Can LP3853ESX-2.5/NOPB directly replace LP3963ESX-2.5/NOPB?

A: Yes. Both parts deliver 3A at 2.5V output with identical TO-263 packaging and operating temperature range. LP3853ESX-2.5/NOPB offers improved dropout voltage (0.6V vs 1.2V) and lower quiescent current (4 mA vs 9 mA), making it functionally superior in most applications. The primary difference is packaging format: LP3853ESX-2.5/NOPB is supplied in Bulk while LP3963ESX-2.5/NOPB is supplied in Tape & Reel.

Q: What is the difference between LP3856ESX-2.5/NOPB and LP3876ESX-2.5/NOPB?

A: Both parts are Texas Instruments products in TO-263 packaging with 3A output at 2.5V. LP3856ESX-2.5/NOPB features lower dropout voltage (0.6V @ 3A) and quiescent current (4 mA) with documented PSRR of 73dB ~ 57dB (120Hz). LP3876ESX-2.5/NOPB has higher dropout voltage (1.2V @ 3A) and quiescent current (5 mA) with unspecified PSRR. LP3856ESX-2.5/NOPB is preferred for applications requiring lower power dissipation and superior noise rejection.

Q: Are all substitute parts ROHS3 compliant?

A: LP3963ESX-2.5/NOPB, LP3856ESX-2.5/NOPB, LP3876ESX-2.5/NOPB, and LP3966ESX-2.5/NOPB are explicitly ROHS3 compliant. LP3853ESX-2.5/NOPB compliance status is not specified in the provided data.

Q: What is the significance of dropout voltage in regulator selection?

A: Dropout voltage determines the minimum voltage difference required between input and output for proper regulation. Lower dropout voltage (0.6V) allows operation with lower input voltages and reduces power dissipation as heat compared to higher dropout voltage (1.2V). Selection depends on available input voltage headroom and thermal management requirements.

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

A: All substitute parts maintain identical output voltage (2.5V), output current (3A), input voltage maximum (7V), operating temperature range (-40°C ~ 125°C), protection features, and TO-263 package pinout. Direct substitution is mechanically and electrically compatible. Design verification is required only if the application depends on specific quiescent current, dropout voltage, or PSRR characteristics.

Q: What packaging formats are available?

A: LP3963ESX-2.5/NOPB, LP3856ESX-2.5/NOPB, LP3876ESX-2.5/NOPB, and LP3966ESX-2.5/NOPB are supplied in Tape & Reel (TR) format suitable for automated assembly. LP3853ESX-2.5/NOPB is supplied in Bulk packaging. Packaging selection depends on manufacturing process requirements and order quantities.

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