LP3856ESX-2.5 Equivalent & Substitute Parts

Part Overview

The LP3856ESX-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 main part number LP3856ESX-2.5 is currently listed as obsolete, making identification of equivalent and substitute parts essential for design continuity and procurement planning. Substitute parts maintain identical electrical performance and mechanical compatibility while offering active product status and improved compliance certifications.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	3A
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.6V @ 3A
Quiescent Current (Iq)	4 mA
PSRR	73dB ~ 57dB (120Hz)
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitute parts for the LP3856ESX-2.5 are classified into two functional groups based on electrical parameter compatibility:

Group 1: Direct Electrical Equivalents

LP3856ESX-2.5/NOPB (Texas Instruments)
LP3853ESX-2.5/NOPB (National Semiconductor)

These parts maintain identical electrical specifications: 0.6V maximum dropout voltage at 3A, 4 mA quiescent current, and 73dB ~ 57dB PSRR. They are fully interchangeable with the original LP3856ESX-2.5 for applications requiring these specific performance characteristics.

Group 2: Functional Equivalents with Relaxed Specifications

LP3876ESX-2.5/NOPB (Texas Instruments)
LP3963ESX-2.5/NOPB (Texas Instruments)
LP3966ESX-2.5/NOPB (Texas Instruments)

These parts share the same output voltage (2.5V), output current (3A), input voltage rating (7V), package (TO-263), and protection features. However, they feature higher dropout voltage (1.2V @ 3A) and higher quiescent current (5-9 mA). These parts are suitable for applications where the relaxed dropout and quiescent current specifications are acceptable.

All substitute parts maintain identical mechanical compatibility through the TO-263 (DDPAK-5) package and identical operating temperature range (-40°C ~ 125°C).

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Dropout (Max)	Quiescent Current (Iq)	PSRR	RoHS Status	Inventory (Pcs)
LP3856ESX-2.5	Texas Instruments	Obsolete	0.6V @ 3A	4 mA	73dB ~ 57dB (120Hz)	Non-compliant	1950
LP3856ESX-2.5/NOPB	Texas Instruments	Active	0.6V @ 3A	4 mA	73dB ~ 57dB (120Hz)	ROHS3 Compliant	1784
LP3853ESX-2.5/NOPB	National Semiconductor	Active	0.6V @ 3A	4 mA	73dB ~ 57dB (120Hz)	Not specified	1622
LP3876ESX-2.5/NOPB	Texas Instruments	Active	1.2V @ 3A	5 mA	Not specified	ROHS3 Compliant	858
LP3963ESX-2.5/NOPB	Texas Instruments	Active	1.2V @ 3A	9 mA	Not specified	ROHS3 Compliant	1418
LP3966ESX-2.5/NOPB	Texas Instruments	Active	1.2V @ 3A	9 mA	Not specified	ROHS3 Compliant	1762

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance): Select LP3856ESX-2.5/NOPB or LP3853ESX-2.5/NOPB when the original specifications must be maintained without modification. LP3856ESX-2.5/NOPB is preferred for new designs due to active product status and ROHS3 compliance certification. Both parts deliver 0.6V dropout voltage and 4 mA quiescent current, ensuring performance parity with the obsolete original.

For Applications Tolerant of Relaxed Specifications: LP3876ESX-2.5/NOPB, LP3963ESX-2.5/NOPB, and LP3966ESX-2.5/NOPB are suitable when circuit design accommodates 1.2V dropout voltage and higher quiescent current (5-9 mA). All three maintain active product status and ROHS3 compliance. Selection among these three depends on quiescent current requirements: LP3876ESX-2.5/NOPB offers the lowest quiescent current (5 mA) in this group.

Compliance Considerations: All substitute parts carry ROHS3 compliance and REACH unaffected status. The original LP3856ESX-2.5 is RoHS non-compliant, making the compliant substitutes mandatory for applications subject to environmental regulations.

Frequently Asked Questions (FAQ)

Q: Can LP3856ESX-2.5/NOPB directly replace the obsolete LP3856ESX-2.5? A: Yes. LP3856ESX-2.5/NOPB is the active equivalent with identical electrical specifications (0.6V dropout, 4 mA Iq, 73dB ~ 57dB PSRR) and mechanical compatibility. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between Group 1 and Group 2 substitutes? A: Group 1 parts (LP3856ESX-2.5/NOPB, LP3853ESX-2.5/NOPB) maintain identical dropout voltage (0.6V) and quiescent current (4 mA). Group 2 parts (LP3876ESX-2.5/NOPB, LP3963ESX-2.5/NOPB, LP3966ESX-2.5/NOPB) feature higher dropout voltage (1.2V) and higher quiescent current (5-9 mA). Group 2 substitutes are suitable only when circuit design tolerates these relaxed specifications.

Q: Are all substitute parts pin-compatible? A: Yes. All substitute parts use the TO-263 (DDPAK-5) package with identical pinout and mechanical dimensions, ensuring direct PCB compatibility without layout modification.

Q: Which substitute offers the best compliance profile? A: All active substitute parts carry ROHS3 compliance and REACH unaffected status. LP3856ESX-2.5/NOPB is recommended for new designs as it maintains the original part number lineage while offering active status and full compliance.

Q: Can LP3963ESX-2.5/NOPB or LP3966ESX-2.5/NOPB be used in low-power applications? A: These parts feature 9 mA quiescent current compared to 4 mA in Group 1 parts. Use in low-power applications only if circuit design accommodates the increased standby current draw.

Q: What is the inventory status for each substitute? A: LP3856ESX-2.5/NOPB (1784 Pcs), LP3853ESX-2.5/NOPB (1622 Pcs), LP3966ESX-2.5/NOPB (1762 Pcs), LP3963ESX-2.5/NOPB (1418 Pcs), and LP3876ESX-2.5/NOPB (858 Pcs) are all available as new original stock.

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