LP3963ES-3.3 Equivalent & Substitute Parts

Part Overview

The LP3963ES-3.3 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed 3.3V output at 3A maximum current in a TO-263 (DDPAK-5) surface mount package. The main part carries a Last Time Buy status, indicating production discontinuation. Identifying equivalent and substitute parts ensures design continuity and supply chain reliability for applications requiring 3.3V linear regulation with 3A output capacity.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	3A
Input Voltage (Max)	7V
Voltage Dropout (Max)	1.2V @ 3A
Quiescent Current (Iq)	9 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
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LP3963ES-3.3 are grouped based on strict electrical and mechanical parameter alignment:

Direct Equivalent (Identical Specifications):

LP3963ES-3.3/NOPB: Identical electrical characteristics and packaging. Differs only in packaging format (Tube vs. unspecified for main part) and product status (Active vs. Last Time Buy).

Parametric Equivalents (Functionally Compatible): Substitute parts must maintain the following critical parameters:

Output voltage: 3.3V fixed
Output current: 3A
Input voltage maximum: 7V
Package type: TO-263 (DDPAK-5)
Operating temperature: -40°C to 125°C
Protection features: Over Current, Over Temperature, Short Circuit
Control features: Enable

Parts meeting these criteria are eligible for substitution. Variations in secondary parameters (voltage dropout, quiescent current, PSRR) do not disqualify substitution if the primary electrical and mechanical specifications align.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Voltage Dropout @ 3A	Quiescent Current (Iq)	Package	Product Status	Inventory
LP3963ES-3.3	Texas Instruments	3.3V	3A	7V	1.2V	9 mA	TO-263 (DDPAK-5)	Last Time Buy	1434 Pcs
LP3963ES-3.3/NOPB	Texas Instruments	3.3V	3A	7V	1.2V	9 mA	TO-263 (DDPAK-5)	Active	1203 Pcs
LP3853ES-3.3/NOPB	Texas Instruments	3.3V	3A	7V	0.6V	4 mA	TO-263 (DDPAK-5)	Active	1356 Pcs
LP3856ES-3.3/NOPB	Texas Instruments	3.3V	3A	7V	0.6V	4 mA	TO-263 (DDPAK-5)	Active	1120 Pcs
LP3873ES-3.3/NOPB	Texas Instruments	3.3V	3A	7V	1.2V	9 mA	TO-263 (DDPAK-5)	Active	3200 Pcs
LP3876ES-3.3/NOPB	Texas Instruments	3.3V	3A	7V	1.2V	5 mA	TO-263 (DDPAK-5)	Active	6460 Pcs
LP3966ES-3.3/NOPB	Texas Instruments	3.3V	3A	7V	1.2V	9 mA	TO-263 (DDPAK-5)	Active	2100 Pcs

Engineering Selection Recommendations

All substitute parts listed are manufactured by Texas Instruments and carry Active product status, ensuring ongoing availability and support. The LP3963ES-3.3/NOPB provides the most direct substitution path, offering identical electrical specifications with Active status and established supply.

For applications where lower quiescent current and reduced voltage dropout are beneficial, LP3853ES-3.3/NOPB and LP3856ES-3.3/NOPB offer improved efficiency characteristics while maintaining full electrical and mechanical compatibility. These parts feature 0.6V dropout versus 1.2V and 4 mA quiescent current versus 9 mA.

LP3873ES-3.3/NOPB, LP3876ES-3.3/NOPB, and LP3966ES-3.3/NOPB maintain the original dropout and quiescent current specifications of the LP3963ES-3.3, providing direct functional equivalence with Active product status and higher inventory availability.

All substitute parts comply with ROHS3 and carry identical MSL ratings (3, 168 Hours), ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can LP3963ES-3.3/NOPB be used as a direct replacement for LP3963ES-3.3?

A: Yes. Both parts deliver identical electrical specifications: 3.3V fixed output, 3A maximum current, 1.2V dropout at 3A, and 9 mA quiescent current. The primary difference is product status (Active vs. Last Time Buy) and packaging format (Tube). Electrical and mechanical compatibility is complete.

Q: What is the difference between LP3873ES-3.3/NOPB and LP3853ES-3.3/NOPB?

A: Both parts share the same output voltage (3.3V), output current (3A), and package (TO-263 DDPAK-5). LP3873ES-3.3/NOPB maintains the original 1.2V dropout and 9 mA quiescent current. LP3853ES-3.3/NOPB offers improved efficiency with 0.6V dropout and 4 mA quiescent current. Selection depends on whether lower power dissipation is required for the application.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use the TO-263 (DDPAK-5) surface mount package, ensuring direct PCB compatibility without layout modifications.

Q: Do all substitute parts support the Enable control feature?

A: Yes. All listed substitute parts include Enable control functionality, maintaining feature parity with the original LP3963ES-3.3.

Q: What protection features are included in the substitute parts?

A: All substitute parts include Over Current, Over Temperature, and Short Circuit protection, matching the protection architecture of the LP3963ES-3.3.

Q: Are the substitute parts RoHS compliant?

A: Yes. All substitute parts carry ROHS3 compliance certification, meeting environmental and regulatory requirements equivalent to the original part.

Q: Which substitute part offers the best inventory availability?

A: LP3876ES-3.3/NOPB provides the highest inventory level at 6460 pieces, followed by LP3873ES-3.3/NOPB at 3200 pieces. Both maintain full electrical and mechanical compatibility with the LP3963ES-3.3.

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