LP3875ESX-3.3 Equivalent & Substitute Parts

Part Overview

The LP3875ESX-3.3 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed 3.3V output at 1.5A in a TO-263 (DDPAK-5) surface mount package. The part is currently listed as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. Substitute parts maintain electrical and mechanical compatibility while offering active product status and improved availability.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	1.5A
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.55V @ 1.5A
Quiescent Current (Iq)	5 mA
Package Type	TO-263 (DDPAK-5)
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitute parts for the LP3875ESX-3.3 are classified based on electrical parameter compatibility and package equivalence. The primary substitution criteria are:

Critical Parameters for Substitution:

Fixed output voltage of 3.3V
Output current rating of 1.5A
Maximum input voltage of 7V
TO-263 (DDPAK-5) package configuration
Operating temperature range of -40°C to 125°C
Enable control feature and core protection functions (Over Current, Over Temperature, Short Circuit)

Substitute Categories:

Direct Manufacturer Equivalent: LP3875ESX-3.3/NOPB (National Semiconductor) maintains identical electrical specifications and packaging, differing only in product status (Active vs. Obsolete) and packaging format (Bulk).

Parametric Equivalents: LP3852ESX-3.3/NOPB, LP3855ESX-3.3/NOPB, LP3872ESX-3.3/NOPB, LP3962ESX-3.3/NOPB, and LP3965ESX-3.3/NOPB share the same output voltage, current rating, package type, and operating temperature range. These parts are functionally interchangeable within the specified electrical parameters.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Voltage	Output Current	Dropout Voltage @ 1.5A	Quiescent Current (Iq)	Supply Current (Max)	Package	RoHS Status
LP3875ESX-3.3	Texas Instruments	Obsolete	3.3V	1.5A	0.55V	5 mA	15 mA	TO-263 (DDPAK-5)	Non-compliant
LP3875ESX-3.3/NOPB	National Semiconductor	Active	3.3V	1.5A	0.55V	5 mA	15 mA	TO-263 (DDPAK-5)	Not specified
LP3852ESX-3.3/NOPB	Texas Instruments	Active	3.3V	1.5A	0.38V	3 mA	10 mA	TO-263 (DDPAK-5)	ROHS3 Compliant
LP3855ESX-3.3/NOPB	National Semiconductor	Active	3.3V	1.5A	0.38V	3 mA	10 mA	TO-263 (DDPAK-5)	Not specified
LP3872ESX-3.3/NOPB	Texas Instruments	Active	3.3V	1.5A	0.55V	5 mA	15 mA	TO-263 (DDPAK-5)	ROHS3 Compliant
LP3962ESX-3.3/NOPB	Texas Instruments	Active	3.3V	1.5A	0.55V	9 mA	15 mA	TO-263 (DDPAK-5)	ROHS3 Compliant
LP3965ESX-3.3/NOPB	National Semiconductor	Active	3.3V	1.5A	0.55V	9 mA	15 mA	TO-263 (DDPAK-5)	Not specified

Engineering Selection Recommendations

For Active Product Status Requirement: LP3875ESX-3.3/NOPB, LP3852ESX-3.3/NOPB, LP3855ESX-3.3/NOPB, LP3872ESX-3.3/NOPB, LP3962ESX-3.3/NOPB, and LP3965ESX-3.3/NOPB are all classified as Active products, providing ongoing manufacturer support and availability compared to the obsolete LP3875ESX-3.3.

For RoHS3 Compliance: LP3852ESX-3.3/NOPB, LP3872ESX-3.3/NOPB, and LP3962ESX-3.3/NOPB carry ROHS3 Compliant certification, meeting regulatory requirements for restricted substances in electrical and electronic equipment.

For Improved Power Efficiency: LP3852ESX-3.3/NOPB and LP3855ESX-3.3/NOPB feature reduced dropout voltage (0.38V vs. 0.55V) and lower quiescent current (3 mA vs. 5 mA), resulting in improved thermal performance and reduced power dissipation in applications with tight voltage margins.

For Direct Electrical Equivalence: LP3875ESX-3.3/NOPB maintains identical electrical specifications to the original part, including dropout voltage and quiescent current characteristics, while offering active product status.

Frequently Asked Questions (FAQ)

Q: Can LP3852ESX-3.3/NOPB replace LP3875ESX-3.3 in existing designs?

A: Yes. Both parts deliver 3.3V at 1.5A in TO-263 (DDPAK-5) packages with identical output current and input voltage ratings. LP3852ESX-3.3/NOPB offers improved performance with lower dropout voltage (0.38V vs. 0.55V) and reduced quiescent current (3 mA vs. 5 mA). No circuit modifications are required.

Q: What is the difference between LP3872ESX-3.3/NOPB and LP3875ESX-3.3?

A: Both parts share identical electrical specifications including 0.55V dropout voltage and 5 mA quiescent current. The primary differences are product status (LP3872ESX-3.3/NOPB is Active; LP3875ESX-3.3 is Obsolete) and RoHS compliance (LP3872ESX-3.3/NOPB is ROHS3 Compliant).

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

A: Yes. All substitute parts use the TO-263 (DDPAK-5) package configuration, ensuring mechanical and thermal compatibility with existing PCB layouts and thermal management designs.

Q: Which substitute offers the best power efficiency?

A: LP3852ESX-3.3/NOPB and LP3855ESX-3.3/NOPB provide the lowest power dissipation with 0.38V dropout voltage and 3 mA quiescent current, compared to 0.55V and 5 mA in the original LP3875ESX-3.3.

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

A: The /NOPB designation indicates the part is supplied without plumbum (lead-free), reflecting RoHS compliance and modern manufacturing standards.

Q: Can I use LP3962ESX-3.3/NOPB or LP3965ESX-3.3/NOPB as substitutes?

A: Yes. Both parts maintain the required 3.3V output, 1.5A current rating, and TO-263 (DDPAK-5) package. They feature higher quiescent current (9 mA vs. 5 mA) but remain functionally compatible within the specified electrical parameters.

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