LP3876ES-3.3 Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The LP3876ES-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 3A maximum current in a TO-263 (DDPAK-5) surface mount package. The main part number is currently listed as obsolete, which necessitates identification of active equivalent alternatives for new designs and production continuity. Substitute parts must maintain identical electrical performance and mechanical compatibility to ensure direct board-level replacement without design modification.

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)	5 mA
Supply Current (Max)	15 mA
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature Range	-40°C to 125°C
Package / Case	TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following criteria:

Primary Compatibility Requirements:

Fixed output voltage of 3.3V
Output current rating of 3A
Maximum input voltage of 7V
TO-263 (DDPAK-5) package configuration
Surface mount mounting type
Operating temperature range of -40°C to 125°C
Enable control feature
Over Current, Over Temperature, and Short Circuit protection

Substitution Categories:

Direct Manufacturer Equivalent: LP3876ES-3.3/NOPB maintains identical electrical specifications to the main part with the addition of RoHS3 compliance and active product status.

Parametric Equivalents with Improved Performance: LP3853ES-3.3/NOPB and LP3856ES-3.3/NOPB offer reduced voltage dropout (0.6V @ 3A versus 1.2V @ 3A) and lower quiescent current (4 mA versus 5 mA), with PSRR specification of 73dB ~ 57dB (120Hz).

Parametric Equivalents with Identical Dropout: LP3873ES-3.3/NOPB, LP3963ES-3.3/NOPB, LP3963ES-3.3, and LP3966ES-3.3/NOPB maintain the 1.2V dropout specification with higher quiescent current (9 mA versus 5 mA) and include PSRR specification where available.

All substitute parts share identical package, pin configuration, and protection feature sets, enabling direct PCB replacement.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Voltage	Output Current	Voltage Dropout @ 3A	Quiescent Current (Iq)	Supply Current (Max)	PSRR	RoHS Status	Inventory (Pcs)
LP3876ES-3.3	Texas Instruments	Obsolete	3.3V	3A	1.2V	5 mA	15 mA	—	RoHS non-compliant	2051
LP3876ES-3.3/NOPB	Texas Instruments	Active	3.3V	3A	1.2V	5 mA	15 mA	—	ROHS3 Compliant	6460
LP3853ES-3.3/NOPB	Texas Instruments	Active	3.3V	3A	0.6V	4 mA	10 mA	73dB ~ 57dB (120Hz)	ROHS3 Compliant	1356
LP3856ES-3.3/NOPB	Texas Instruments	Active	3.3V	3A	0.6V	4 mA	10 mA	73dB ~ 57dB (120Hz)	ROHS3 Compliant	1120
LP3873ES-3.3/NOPB	Texas Instruments	Active	3.3V	3A	1.2V	9 mA	15 mA	73dB ~ 57dB (120Hz)	ROHS3 Compliant	3200
LP3963ES-3.3/NOPB	Texas Instruments	Active	3.3V	3A	1.2V	9 mA	15 mA	—	ROHS3 Compliant	1203
LP3966ES-3.3/NOPB	Texas Instruments	Active	3.3V	3A	1.2V	9 mA	15 mA	—	ROHS3 Compliant	2100
LP3963ES-3.3	Texas Instruments	Last Time Buy	3.3V	3A	1.2V	9 mA	15 mA	—	ROHS3 Compliant	1434

Engineering Selection Recommendations

For New Designs and Production Continuity:

LP3876ES-3.3/NOPB is the primary recommended substitute. It maintains identical electrical specifications to the obsolete main part while providing active product status and ROHS3 compliance. This part offers the highest inventory availability (6460 units) and ensures long-term supply chain stability.

For Applications Requiring Reduced Power Dissipation:

LP3853ES-3.3/NOPB and LP3856ES-3.3/NOPB are suitable alternatives when lower voltage dropout and quiescent current are beneficial. These parts reduce dropout from 1.2V to 0.6V at 3A and lower quiescent current from 5 mA to 4 mA, resulting in decreased thermal load. Both include PSRR specification (73dB ~ 57dB at 120Hz) and maintain active product status.

For Designs with Existing Specifications Matching Higher Quiescent Current:

LP3873ES-3.3/NOPB, LP3963ES-3.3/NOPB, LP3966ES-3.3/NOPB, and LP3963ES-3.3 are functionally equivalent with quiescent current of 9 mA. All are active products with ROHS3 compliance. LP3873ES-3.3/NOPB offers the highest inventory (3200 units) among this group.

Compliance Considerations:

All recommended substitutes are ROHS3 compliant and REACH unaffected, meeting modern regulatory requirements. The obsolete main part (LP3876ES-3.3) is RoHS non-compliant and should not be specified for new designs.

Frequently Asked Questions (FAQ)

Q: Can LP3876ES-3.3/NOPB be used as a direct replacement for LP3876ES-3.3?

A: Yes. LP3876ES-3.3/NOPB is the direct manufacturer equivalent with identical electrical specifications. The primary differences are active product status and ROHS3 compliance. Pin configuration and package dimensions are identical, enabling direct PCB substitution.

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

A: Both parts deliver 3.3V at 3A in the same TO-263 package. LP3853ES-3.3/NOPB features lower voltage dropout (0.6V versus 1.2V at 3A) and lower quiescent current (4 mA versus 9 mA), making it more efficient for power-sensitive applications. LP3873ES-3.3/NOPB maintains the original 1.2V dropout specification. Both include PSRR specification and are active products.

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

A: Yes. All substitute parts use the TO-263-6 (D2PAK with 5 Leads + Tab) package configuration, ensuring mechanical and electrical compatibility with existing PCB layouts.

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

A: The /NOPB suffix indicates lead-free (Pb-free) packaging, which is standard for RoHS3 compliance. Parts without this suffix may use lead-based solder and are typically designated as Last Time Buy or obsolete.

Q: Which substitute offers the best inventory availability?

A: LP3876ES-3.3/NOPB has the highest inventory at 6460 units, followed by LP3873ES-3.3/NOPB at 3200 units. Both are active products suitable for immediate procurement.

Q: Can LP3963ES-3.3 (without /NOPB) be used in new designs?

A: LP3963ES-3.3 is designated as Last Time Buy, indicating limited future availability. For new designs, LP3963ES-3.3/NOPB (active status) is the preferred alternative. Both share identical electrical specifications and package configuration.

Q: What thermal considerations apply when selecting between these regulators?

A: Voltage dropout directly affects thermal dissipation. LP3853ES-3.3/NOPB and LP3856ES-3.3/NOPB reduce dropout to 0.6V at 3A, lowering heat generation compared to the 1.2V dropout of other variants. Quiescent current also contributes to standby power consumption, with LP3853ES-3.3/NOPB and LP3856ES-3.3/NOPB consuming 4 mA versus 9 mA for other active alternatives.

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