LP3873ES-2.5/NOPB Equivalent & Substitute Parts

Part Overview

The LP3873ES-2.5/NOPB is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive 2.5V output at 3A maximum current in a TO-263 (DDPAK-5) surface mount package. The device is currently in active production status with 854 units in stock.

Substitute parts become necessary when the primary part reaches end-of-life status, experiences supply constraints, or when design flexibility requires alternative qualified components that maintain electrical and mechanical compatibility within the same application requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP3873ES-2.5/NOPB
Manufacturer	Texas Instruments
Output Voltage (Fixed)	2.5V
Output Current	3A
Input Voltage (Max)	7V
Voltage Dropout (Max)	1.2V @ 3A
Quiescent Current	9 mA
Package Type	TO-263 (DDPAK-5)
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters:

Fixed output voltage of 2.5V
Maximum output current 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

Five substitute parts meet these criteria. Differences exist in voltage dropout characteristics and quiescent current consumption, which affect thermal performance and power efficiency but do not prevent functional substitution in applications designed for the LP3873ES-2.5/NOPB specifications.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage @ 3A	Quiescent Current	Package	Product Status	Inventory
LP3873ES-2.5/NOPB	Texas Instruments	2.5V	3A	7V	1.2V	9 mA	TO-263 (DDPAK-5)	Active	854 Pcs
LP3853ES-2.5/NOPB	Texas Instruments	2.5V	3A	7V	0.6V	4 mA	TO-263 (DDPAK-5)	Active	1087 Pcs
LP3856ES-2.5/NOPB	National Semiconductor	2.5V	3A	7V	0.6V	4 mA	TO-263 (DDPAK-5)	Active	1203 Pcs
LP3963ES-2.5/NOPB	Texas Instruments	2.5V	3A	7V	1.2V	9 mA	TO-263 (DDPAK-5)	Active	2200 Pcs
LP3966ES-2.5/NOPB	Texas Instruments	2.5V	3A	7V	1.2V	9 mA	TO-263 (DDPAK-5)	Active	1058 Pcs
LP3853ES-2.5	Texas Instruments	2.5V	3A	7V	0.6V	4 mA	TO-263 (DDPAK-5)	Last Time Buy	1200 Pcs

Engineering Selection Recommendations

All six substitute parts maintain full electrical and mechanical compatibility with the LP3873ES-2.5/NOPB within the specified parameter envelope. Selection should prioritize the following factors:

Product Status Priority: LP3963ES-2.5/NOPB, LP3966ES-2.5/NOPB, LP3853ES-2.5/NOPB, and LP3856ES-2.5/NOPB are all in active production status. LP3853ES-2.5 carries Last Time Buy status and should be avoided for new designs requiring long-term supply assurance.

Compliance and Certification: All active-status parts maintain ROHS3 compliance and REACH unaffected status. LP3853ES-2.5 shows REACH affected status, which may introduce supply chain documentation requirements.

Performance Characteristics: LP3853ES-2.5/NOPB and LP3856ES-2.5/NOPB offer superior dropout voltage performance (0.6V versus 1.2V) and lower quiescent current (4 mA versus 9 mA), resulting in reduced thermal dissipation and improved power efficiency in applications with tight input voltage margins.

Inventory Availability: LP3963ES-2.5/NOPB provides the highest current stock level at 2200 units, followed by LP3856ES-2.5/NOPB at 1203 units.

Frequently Asked Questions (FAQ)

Q: Can LP3853ES-2.5/NOPB replace LP3873ES-2.5/NOPB directly without circuit modification?

A: Yes. Both parts deliver identical fixed 2.5V output at 3A maximum current in the same TO-263 (DDPAK-5) package. The LP3853ES-2.5/NOPB features lower dropout voltage and quiescent current, which improve thermal performance but do not require design changes.

Q: What is the difference between LP3853ES-2.5/NOPB and LP3853ES-2.5?

A: Both parts are electrically identical. LP3853ES-2.5/NOPB is in active production with standard packaging (Tube). LP3853ES-2.5 is designated Last Time Buy status and should not be selected for new designs requiring extended supply availability.

Q: Are LP3963ES-2.5/NOPB and LP3966ES-2.5/NOPB interchangeable with LP3873ES-2.5/NOPB?

A: Yes. All three parts share identical electrical specifications: 2.5V fixed output, 3A current, 1.2V dropout voltage at 3A, and 9 mA quiescent current. They are housed in the same TO-263 (DDPAK-5) package and operate across the same temperature range.

Q: Why does LP3856ES-2.5/NOPB show National Semiconductor as manufacturer while others are Texas Instruments?

A: LP3856ES-2.5/NOPB is manufactured by National Semiconductor. It maintains full parametric equivalence to the Texas Instruments LP3873ES-2.5/NOPB across all critical electrical and mechanical specifications, including the same TO-263 (DDPAK-5) package footprint.

Q: Which substitute part offers the best thermal performance?

A: LP3853ES-2.5/NOPB and LP3856ES-2.5/NOPB both feature 0.6V dropout voltage at 3A and 4 mA quiescent current, compared to 1.2V and 9 mA respectively for the LP3873ES-2.5/NOPB. Lower dropout voltage and quiescent current reduce power dissipation and junction temperature rise.

Q: Is the TO-263 (DDPAK-5) package footprint identical across all substitute parts?

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

Q: What compliance certifications apply to all active-status substitute parts?

A: All active-status substitute parts (LP3853ES-2.5/NOPB, LP3856ES-2.5/NOPB, LP3963ES-2.5/NOPB, LP3966ES-2.5/NOPB) are ROHS3 compliant and REACH unaffected. ECCN classification is EAR99 for all parts.

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