LP3873ES-5.0 Equivalent & Substitute Parts

Part Overview

The LP3873ES-5.0 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed 5V output at 3A maximum current in a TO-263 (DDPAK-5) surface mount package. The main part number LP3873ES-5.0 is currently obsolete, with 1,015 units available in inventory. Due to its obsolete status, equivalent substitute parts with active product status are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	3A
Input Voltage (Max)	7V
Voltage Dropout (Max)	1.2V @ 3A
Quiescent Current (Iq)	9 mA
PSRR	73dB ~ 57dB (120Hz)
Operating Temperature Range	-40°C ~ 125°C
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution eligibility for the LP3873ES-5.0 is determined by the following critical parameters:

Output voltage fixed at 5V
Output current capability of 3A
Maximum input voltage of 7V
TO-263 (DDPAK-5) package compatibility
Enable control feature
Over Current, Over Temperature, and Short Circuit protection

The substitute parts are grouped into two categories based on electrical performance characteristics:

Direct Equivalent (Identical Electrical Performance): LP3873ES-5.0/NOPB and LP3876ES-5.0/NOPB maintain the same voltage dropout specification of 1.2V @ 3A and quiescent current of 9 mA (LP3873ES-5.0/NOPB) or 5 mA (LP3876ES-5.0/NOPB).

Parametric Equivalent (Enhanced Performance): LP3853ES-5.0/NOPB and LP3856ES-5.0/NOPB offer improved electrical characteristics with reduced voltage dropout of 0.6V @ 3A and lower quiescent current of 4 mA, while maintaining identical output voltage, current, and package specifications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Voltage	Output Current	Voltage Dropout @ 3A	Quiescent Current (Iq)	Package	RoHS Status	Inventory
LP3873ES-5.0	Texas Instruments	Obsolete	5V	3A	1.2V	9 mA	TO-263 (DDPAK-5)	Non-compliant	1,015 Pcs
LP3873ES-5.0/NOPB	Texas Instruments	Active	5V	3A	1.2V	9 mA	TO-263 (DDPAK-5)	ROHS3 Compliant	2,300 Pcs
LP3853ES-5.0/NOPB	Texas Instruments	Active	5V	3A	0.6V	4 mA	TO-263 (DDPAK-5)	ROHS3 Compliant	2,200 Pcs
LP3856ES-5.0/NOPB	Texas Instruments	Active	5V	3A	0.6V	4 mA	TO-263 (DDPAK-5)	ROHS3 Compliant	999 Pcs
LP3876ES-5.0/NOPB	Texas Instruments	Active	5V	3A	1.2V	5 mA	TO-263 (DDPAK-5)	ROHS3 Compliant	762 Pcs

Engineering Selection Recommendations

All substitute parts are manufactured by Texas Instruments and share identical mechanical and functional specifications with the obsolete LP3873ES-5.0. Selection should be based on the following criteria:

For Direct Replacement: LP3873ES-5.0/NOPB is the direct equivalent with active product status and ROHS3 compliance. This part maintains identical electrical performance and is the primary choice for legacy design continuity.

For New Designs: LP3853ES-5.0/NOPB or LP3856ES-5.0/NOPB are recommended for new applications. Both offer superior electrical performance with reduced voltage dropout (0.6V vs. 1.2V) and lower quiescent current (4 mA vs. 9 mA), resulting in improved efficiency and thermal performance. Both are ROHS3 compliant and actively produced.

For Inventory Optimization: LP3876ES-5.0/NOPB provides a balance between direct equivalence and enhanced performance, with reduced quiescent current (5 mA) while maintaining the original voltage dropout specification (1.2V @ 3A). This part is ROHS3 compliant and actively produced.

All substitute parts are packaged in Tube format and carry REACH Unaffected status with identical MSL rating of 3 (168 Hours).

Frequently Asked Questions (FAQ)

Q: Can LP3873ES-5.0/NOPB directly replace the obsolete LP3873ES-5.0?

A: Yes. LP3873ES-5.0/NOPB is the direct equivalent with identical electrical specifications, output voltage, current rating, and TO-263 package. The primary difference is active product status and ROHS3 compliance.

Q: What is the difference between LP3873ES-5.0/NOPB and LP3853ES-5.0/NOPB?

A: Both deliver 5V at 3A in the same TO-263 package. LP3853ES-5.0/NOPB offers improved performance with lower voltage dropout (0.6V vs. 1.2V @ 3A) and reduced quiescent current (4 mA vs. 9 mA), resulting in lower power dissipation and improved thermal characteristics.

Q: Are all substitute parts pin-compatible with the original LP3873ES-5.0?

A: Yes. All substitute parts use the TO-263 (DDPAK-5) package with identical pinout and mechanical dimensions, ensuring direct PCB compatibility without layout modifications.

Q: Which substitute part should I choose for a new design?

A: LP3853ES-5.0/NOPB or LP3856ES-5.0/NOPB are recommended for new designs due to superior electrical performance, active product status, and ROHS3 compliance. Both provide reduced voltage dropout and quiescent current compared to the original specification.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts (LP3873ES-5.0/NOPB, LP3853ES-5.0/NOPB, LP3856ES-5.0/NOPB, and LP3876ES-5.0/NOPB) are ROHS3 compliant. The original LP3873ES-5.0 is RoHS non-compliant.

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

A: The /NOPB suffix indicates the part is supplied without lead (Pb) in the solder ball or termination, confirming RoHS compliance and lead-free manufacturing.

Q: Can I use LP3853ES-5.0/NOPB as a drop-in replacement in existing designs?

A: Yes. LP3853ES-5.0/NOPB is electrically and mechanically compatible with the original LP3873ES-5.0. The improved performance characteristics (lower dropout voltage and quiescent current) are beneficial and do not introduce compatibility issues.

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