LP3873ES-2.5 Equivalent & Substitute Parts

Part Overview

The LP3873ES-2.5 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive output of 2.5V at 3A in a TO-263 (DDPAK-5) surface mount package. The device features integrated protection against overcurrent, overtemperature, and short circuit conditions, with an enable control feature for power management applications.

The LP3873ES-2.5 carries a Last Time Buy product status, indicating limited availability. Identifying equivalent and substitute parts ensures design continuity and supply chain flexibility for applications requiring this regulator specification.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
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

Substitution of the LP3873ES-2.5 is determined by strict equivalence across the following critical parameters:

Fixed output voltage of 2.5V
Output current capability of 3A
Maximum input voltage of 7V
TO-263 (DDPAK-5) package configuration
Operating temperature range of -40°C to 125°C
Presence of enable control and integrated protection features (overcurrent, overtemperature, short circuit)

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalent: Parts with identical electrical specifications and packaging, differing only in packaging format (Bulk vs. Tube) or product status.

Parametric Equivalents: Parts meeting all critical electrical and mechanical requirements with minor variations in secondary parameters such as quiescent current or PSRR specifications, while maintaining functional compatibility.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Dropout Voltage @ 3A	Quiescent Current	Package	Product Status	Inventory
LP3873ES-2.5	Texas Instruments	2.5V	3A	1.2V	9 mA	TO-263 (DDPAK-5)	Last Time Buy	1205 Pcs
LP3873ES-2.5/NOPB	National Semiconductor	2.5V	3A	1.2V	9 mA	TO-263 (DDPAK-5)	Active	1175 Pcs
LP3853ES-2.5/NOPB	Texas Instruments	2.5V	3A	0.6V	4 mA	TO-263 (DDPAK-5)	Active	1087 Pcs
LP3856ES-2.5/NOPB	National Semiconductor	2.5V	3A	0.6V	4 mA	TO-263 (DDPAK-5)	Active	1203 Pcs
LP3876ES-2.5/NOPB	Texas Instruments	2.5V	3A	1.2V	5 mA	TO-263 (DDPAK-5)	Active	1259 Pcs
LP3963ES-2.5/NOPB	Texas Instruments	2.5V	3A	1.2V	9 mA	TO-263 (DDPAK-5)	Active	2200 Pcs
LP3966ES-2.5/NOPB	Texas Instruments	2.5V	3A	1.2V	9 mA	TO-263 (DDPAK-5)	Active	1058 Pcs
LP3853ES-2.5	Texas Instruments	2.5V	3A	0.6V	4 mA	TO-263 (DDPAK-5)	Last Time Buy	1200 Pcs

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

LP3873ES-2.5/NOPB from National Semiconductor provides a direct functional equivalent with Active product status, ensuring long-term availability. This part maintains identical electrical performance (1.2V dropout at 3A, 9 mA quiescent current) and packaging.

For Enhanced Performance (Lower Dropout Voltage):

LP3853ES-2.5/NOPB and LP3856ES-2.5/NOPB offer reduced dropout voltage (0.6V @ 3A) and lower quiescent current (4 mA), providing improved efficiency in power-constrained applications. Both maintain Active product status and full TO-263 package compatibility. LP3853ES-2.5/NOPB is manufactured by Texas Instruments; LP3856ES-2.5/NOPB is from National Semiconductor.

For Balanced Performance and Availability:

LP3963ES-2.5/NOPB and LP3966ES-2.5/NOPB maintain specifications identical to the original LP3873ES-2.5 (1.2V dropout, 9 mA quiescent current) with Active product status and highest inventory availability (2200 Pcs and 1058 Pcs respectively).

Compliance Considerations:

All substitute parts listed are ROHS3 compliant and carry EAR99 export classification. The original LP3873ES-2.5 is ROHS3 compliant; LP3853ES-2.5 (without /NOPB suffix) shows REACH Affected status, requiring verification for specific applications.

Frequently Asked Questions (FAQ)

Q: Can LP3853ES-2.5/NOPB replace LP3873ES-2.5 directly?

A: Yes, with design consideration. LP3853ES-2.5/NOPB is electrically compatible and pin-compatible in TO-263 packaging. The lower dropout voltage (0.6V vs. 1.2V) and reduced quiescent current (4 mA vs. 9 mA) represent performance improvements. Verify that your power supply design accommodates the lower dropout specification.

Q: What is the difference between LP3873ES-2.5 and LP3873ES-2.5/NOPB?

A: Both parts are functionally identical. The /NOPB suffix indicates "No Plumbum" (lead-free) packaging format. LP3873ES-2.5/NOPB is supplied in Bulk packaging, while LP3873ES-2.5 is supplied in Tube packaging. Electrical specifications and performance are equivalent.

Q: Are all substitute parts available in the same TO-263 package?

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

Q: Which substitute offers the best efficiency?

A: LP3853ES-2.5/NOPB and LP3856ES-2.5/NOPB provide the lowest dropout voltage (0.6V @ 3A) and lowest quiescent current (4 mA), resulting in reduced power dissipation and improved efficiency in battery-powered or thermally constrained applications.

Q: What is the inventory status for long-term supply?

A: LP3963ES-2.5/NOPB offers the highest inventory (2200 Pcs) with Active product status, providing the most reliable long-term availability. LP3873ES-2.5/NOPB (1175 Pcs) and LP3876ES-2.5/NOPB (1259 Pcs) also maintain Active status with substantial stock levels.

Q: Are there any compliance differences between substitute parts?

A: All substitute parts are ROHS3 compliant and carry EAR99 export classification. The original LP3873ES-2.5 and most substitutes are ROHS3 compliant. LP3853ES-2.5 (without /NOPB) shows REACH Affected status; verify applicability for your specific regulatory requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message