LP3962ESX-1.8 Linear Voltage Regulator IC — Equivalent & Substitute Parts

Part Overview

The LP3962ESX-1.8 is a linear voltage regulator IC manufactured by Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive 1.8V output at 1.5A in a TO-263 (DDPAK-5) surface mount package. The device is currently listed as obsolete, making identification of active equivalent and substitute parts essential for ongoing production and design continuity. This reference page provides parametric equivalents and manufacturer-recommended alternatives that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.8V
Output Current	1.5A
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.55V @ 1.5A
Quiescent Current (Iq)	9 mA
Operating Temperature Range	-40°C to 125°C
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution eligibility for the LP3962ESX-1.8 is determined by the following critical parameters:

Fixed output voltage of 1.8V
Output current rating of 1.5A
Maximum input voltage of 7V or greater
TO-263 (DDPAK-5) package compatibility
Surface mount configuration
Operating temperature range of -40°C to 125°C
Enable control feature
Over current, over temperature, and short circuit protection

Substitute parts are grouped into two categories: Texas Instruments parametric equivalents (LP3852ESX-1.8/NOPB, LP3855ESX-1.8/NOPB, LP3872ESX-1.8/NOPB, LP3875ESX-1.8/NOPB, LP3962ESX-1.8/NOPB, LP3965ESX-1.8/NOPB) and manufacturer-recommended alternatives from Microchip Technology (MIC39151-1.8WU, MIC39151-1.8WU-TR). All listed parts meet the core electrical and mechanical requirements for direct substitution.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout @ 1.5A	Iq (mA)	Package	Product Status	RoHS Status
LP3962ESX-1.8	Texas Instruments	1.8V	1.5A	7V	0.55V	9	TO-263-6	Obsolete	Non-compliant
LP3852ESX-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.38V	3	TO-263-6	Active	ROHS3 Compliant
LP3855ESX-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.38V	3	TO-263-6	Active	ROHS3 Compliant
LP3872ESX-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.55V	5	TO-263-6	Active	ROHS3 Compliant
LP3875ESX-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.55V	5	TO-263-6	Active	ROHS3 Compliant
LP3962ESX-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.55V	9	TO-263-6	Active	ROHS3 Compliant
LP3965ESX-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.55V	9	TO-263-6	Active	ROHS3 Compliant
MIC39151-1.8WU	Microchip Technology	1.8V	1.5A	16V	0.5V	—	TO-263-6	Active	ROHS3 Compliant
MIC39151-1.8WU-TR	Microchip Technology	1.8V	1.5A	16V	0.5V	—	TO-263-6	Active	ROHS3 Compliant

Engineering Selection Recommendations

For applications requiring the LP3962ESX-1.8, the following selection criteria apply:

Texas Instruments Parametric Equivalents: LP3852ESX-1.8/NOPB and LP3855ESX-1.8/NOPB offer improved performance with lower quiescent current (3 mA) and reduced dropout voltage (0.38V @ 1.5A) while maintaining full RoHS3 compliance and active product status. LP3872ESX-1.8/NOPB, LP3875ESX-1.8/NOPB, LP3962ESX-1.8/NOPB, and LP3965ESX-1.8/NOPB maintain electrical characteristics identical to the original part and are all RoHS3 compliant with active status.

Microchip Technology Alternatives: MIC39151-1.8WU and MIC39151-1.8WU-TR are manufacturer-recommended substitutes offering higher maximum input voltage (16V versus 7V), lower dropout voltage (0.5V @ 1.5A), and additional reverse polarity protection. Both are RoHS3 compliant and active. MIC39151-1.8WU-TR is supplied in Tape & Reel packaging, while MIC39151-1.8WU is supplied in Tube packaging.

All substitute parts are RoHS3 compliant, addressing the non-compliance status of the original obsolete part. Selection should prioritize active product status and compliance requirements for new designs.

Frequently Asked Questions (FAQ)

Q: Can LP3852ESX-1.8/NOPB directly replace LP3962ESX-1.8 in existing designs?

A: Yes. Both parts share identical output voltage (1.8V), output current (1.5A), input voltage rating (7V max), operating temperature range (-40°C to 125°C), and TO-263-6 package. LP3852ESX-1.8/NOPB offers superior performance with lower dropout voltage and quiescent current.

Q: What is the difference between LP3872ESX-1.8/NOPB and LP3852ESX-1.8/NOPB?

A: Both deliver 1.8V at 1.5A in TO-263-6 packages. LP3852ESX-1.8/NOPB has lower quiescent current (3 mA versus 5 mA) and lower dropout voltage (0.38V versus 0.55V @ 1.5A). LP3872ESX-1.8/NOPB includes PSRR specification (73dB ~ 57dB at 120Hz).

Q: Are Microchip MIC39151-1.8WU variants compatible with the original LP3962ESX-1.8 footprint?

A: Yes. Both use TO-263-6 (D2PAK with 5 leads plus tab) surface mount packages. MIC39151-1.8WU and MIC39151-1.8WU-TR differ only in packaging format (Tube versus Tape & Reel). The MIC39151 series supports higher input voltage (16V maximum) and includes reverse polarity protection.

Q: Why is RoHS3 compliance important for LP3962ESX-1.8 substitution?

A: The original LP3962ESX-1.8 is RoHS non-compliant. All active substitute parts listed are RoHS3 compliant, meeting current regulatory requirements for new production and design implementations.

Q: What packaging options are available for Texas Instruments equivalents?

A: LP3852ESX-1.8/NOPB and LP3855ESX-1.8/NOPB are supplied in Tape & Reel (TR) packaging. LP3872ESX-1.8/NOPB, LP3875ESX-1.8/NOPB, LP3962ESX-1.8/NOPB, and LP3965ESX-1.8/NOPB are supplied in Cut Tape (CT) & Digi-Reel® or Tape & Reel formats. Verify packaging requirements with your procurement specification.

Q: Can I use MIC39151-1.8WU-TR in high-volume production?

A: Yes. MIC39151-1.8WU-TR is supplied in Tape & Reel packaging suitable for automated assembly. It is RoHS3 compliant, active, and rated for -40°C to 125°C operation with 1.5A output current and 1.8V fixed output.

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