LP3875ESX-1.8 Equivalent & Substitute Parts

Part Overview

The LP3875ESX-1.8 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed 1.8V output at 1.5A maximum current in a TO-263 (DDPAK-5) surface mount package. The main part number LP3875ESX-1.8 carries an obsolete product status, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Active alternatives with identical or superior electrical characteristics are available from the same manufacturer family.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.8V
Output Current	1.5A
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.55V @ 1.5A (0.38V for LP3852/LP3855)
Quiescent Current (Iq)	5 mA (3 mA for LP3852/LP3855; 9 mA for LP3962/LP3965)
Operating Temperature Range	-40°C to 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 LP3875ESX-1.8 is determined by the following criteria:

Primary Substitution Parameters:

Fixed output voltage of 1.8V
Output current rating of 1.5A
Maximum input voltage of 7V
Surface mount TO-263 (DDPAK-5) package
Operating temperature range of -40°C to 125°C
Enable control feature
Over Current, Over Temperature, and Short Circuit protection

Substitute Categories:

Direct Equivalent (LP3875ESX-1.8/NOPB): Identical electrical specifications with active product status and improved compliance (ROHS3 Compliant, REACH Affected).
Parametric Equivalents with Improved Performance (LP3852ESX-1.8/NOPB, LP3855ESX-1.8/NOPB): Lower voltage dropout (0.38V vs. 0.55V) and reduced quiescent current (3 mA vs. 5 mA), maintaining all other critical parameters.
Parametric Equivalents with Identical Dropout (LP3872ESX-1.8/NOPB, LP3962ESX-1.8/NOPB, LP3965ESX-1.8/NOPB): Match the 0.55V dropout specification with variations in quiescent current (5 mA or 9 mA).

All substitute parts maintain identical output voltage, output current, input voltage limits, package type, operating temperature range, and protection features.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Voltage	Output Current	Dropout (Max)	Iq (mA)	RoHS Status	Inventory (Pcs)
LP3875ESX-1.8	Texas Instruments	Obsolete	1.8V	1.5A	0.55V @ 1.5A	5	Non-compliant	3880
LP3875ESX-1.8/NOPB	Texas Instruments	Active	1.8V	1.5A	0.55V @ 1.5A	5	ROHS3 Compliant	1314
LP3852ESX-1.8/NOPB	Texas Instruments	Active	1.8V	1.5A	0.38V @ 1.5A	3	ROHS3 Compliant	1478
LP3855ESX-1.8/NOPB	Texas Instruments	Active	1.8V	1.5A	0.38V @ 1.5A	3	ROHS3 Compliant	1212
LP3872ESX-1.8/NOPB	Texas Instruments	Active	1.8V	1.5A	0.55V @ 1.5A	5	ROHS3 Compliant	3400
LP3962ESX-1.8/NOPB	Texas Instruments	Active	1.8V	1.5A	0.55V @ 1.5A	9	ROHS3 Compliant	2300
LP3965ESX-1.8/NOPB	Texas Instruments	Active	1.8V	1.5A	0.55V @ 1.5A	9	ROHS3 Compliant	1425

Engineering Selection Recommendations

For Direct Replacement (Obsolete to Active): LP3875ESX-1.8/NOPB is the primary choice, offering identical electrical performance with active product status and ROHS3 compliance. This part maintains the original 0.55V dropout and 5 mA quiescent current specifications.

For Improved Power Efficiency: LP3852ESX-1.8/NOPB and LP3855ESX-1.8/NOPB provide superior performance with reduced voltage dropout (0.38V) and lower quiescent current (3 mA). These parts are suitable for applications where power dissipation and thermal management are critical considerations. Both are ROHS3 compliant and carry active product status.

For High-Volume Availability: LP3872ESX-1.8/NOPB offers the highest inventory level (3400 pcs) with active status and ROHS3 compliance, maintaining identical electrical specifications to the original part.

Compliance Considerations: All substitute parts are ROHS3 compliant. LP3875ESX-1.8/NOPB and LP3965ESX-1.8/NOPB carry REACH Affected status, while LP3852ESX-1.8/NOPB, LP3855ESX-1.8/NOPB, LP3872ESX-1.8/NOPB, and LP3962ESX-1.8/NOPB are REACH Unaffected. Selection should align with end-product regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can LP3852ESX-1.8/NOPB replace LP3875ESX-1.8 in existing designs? A: Yes. LP3852ESX-1.8/NOPB maintains the same output voltage (1.8V), output current (1.5A), input voltage limits (7V max), package type (TO-263), and operating temperature range (-40°C to 125°C). The lower dropout voltage (0.38V vs. 0.55V) and reduced quiescent current (3 mA vs. 5 mA) represent performance improvements with no functional incompatibility.

Q: What is the difference between LP3875ESX-1.8 and LP3875ESX-1.8/NOPB? A: The /NOPB suffix indicates lead-free, halogen-free packaging compliant with ROHS3 standards. LP3875ESX-1.8/NOPB is the active production version with identical electrical specifications. The original LP3875ESX-1.8 is obsolete and non-compliant with modern environmental regulations.

Q: Are all substitute parts in the same package? A: Yes. All listed substitute parts use the TO-263-6 (D2PAK with 5 Leads + Tab) surface mount package, ensuring mechanical and thermal compatibility.

Q: Which substitute offers the best power efficiency? A: LP3852ESX-1.8/NOPB and LP3855ESX-1.8/NOPB both deliver the lowest quiescent current (3 mA) and lowest dropout voltage (0.38V @ 1.5A), minimizing power dissipation in battery-powered or thermally constrained applications.

Q: What is the significance of PSRR specification? A: Power Supply Rejection Ratio (PSRR) of 73dB ~ 57dB (120Hz) is specified for LP3875ESX-1.8, LP3875ESX-1.8/NOPB, LP3852ESX-1.8/NOPB, LP3855ESX-1.8/NOPB, and LP3872ESX-1.8/NOPB. LP3962ESX-1.8/NOPB and LP3965ESX-1.8/NOPB do not provide PSRR data in available specifications.

Q: Are there inventory considerations for procurement? A: Yes. LP3872ESX-1.8/NOPB has the highest inventory (3400 pcs), followed by LP3962ESX-1.8/NOPB (2300 pcs). For time-sensitive projects, these parts offer better availability. LP3855ESX-1.8/NOPB has the lowest inventory (1212 pcs).

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