LP3963ESX-1.8 Equivalent & Substitute Parts

Part Overview

The LP3963ESX-1.8 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 1.8V output at 3A in a TO-263 (DDPAK-5) surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The regulator features enable control, over-current protection, over-temperature protection, and short-circuit protection, with a maximum input voltage of 7V and dropout voltage of 1.2V at 3A.

Key Parameters

Parameter	LP3963ESX-1.8
Output Voltage (Fixed)	1.8V
Output Current	3A
Input Voltage (Max)	7V
Dropout Voltage @ 3A	1.2V
Quiescent Current	9 mA
Package	TO-263 (DDPAK-5)
Operating Temperature	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LP3963ESX-1.8 is determined by the following critical parameters:

Fixed output voltage of 1.8V
Output current capability of 3A minimum
TO-263 (DDPAK-5) package compatibility
Operating temperature range of -40°C to 125°C
Surface mount mounting type
Enable control feature
Protection against over-current, over-temperature, and short-circuit conditions

Substitute parts are grouped into two categories: MFR Recommended substitutes (manufacturer-endorsed alternatives) and Parametric Equivalents (parts meeting core electrical and mechanical specifications). All listed substitutes maintain the same output voltage, current rating, package form factor, and temperature range as the original part.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage @ 3A	Quiescent Current	Package	Product Status	RoHS Status
LP3963ESX-1.8	Texas Instruments	1.8V	3A	7V	1.2V	9 mA	TO-263 (DDPAK-5)	Obsolete	ROHS3 Compliant
TPS75718KTTR	Texas Instruments	1.8V	3A	5.5V	—	200 µA	TO-263 (DDPAK-5)	Active	ROHS3 Compliant
LP3853ESX-1.8/NOPB	Texas Instruments	1.8V	3A	7V	0.6V	4 mA	TO-263 (DDPAK-5)	Active	ROHS3 Compliant
LP3856ESX-1.8/NOPB	Texas Instruments	1.8V	3A	7V	0.6V	4 mA	TO-263 (DDPAK-5)	Active	ROHS3 Compliant
LP3873ESX-1.8/NOPB	National Semiconductor	1.8V	3A	7V	1.2V	9 mA	TO-263 (DDPAK-5)	Active	—
LP3876ESX-1.8/NOPB	Texas Instruments	1.8V	3A	7V	1.2V	5 mA	TO-263 (DDPAK-5)	Active	ROHS3 Compliant
LP3966ESX-1.8	Texas Instruments	1.8V	3A	7V	1.2V	9 mA	TO-263 (DDPAK-5)	Last Time Buy	ROHS3 Compliant
LP3966ESX-1.8/NOPB	Texas Instruments	1.8V	3A	7V	1.2V	9 mA	TO-263 (DDPAK-5)	Active	ROHS3 Compliant
MIC39301-1.8WU	Microchip Technology	1.8V	3A	16V	0.55V	—	TO-263 (DDPAK-5)	Active	ROHS3 Compliant

Engineering Selection Recommendations

MFR Recommended Substitutes:

TPS75718KTTR (Texas Instruments) is the manufacturer-recommended primary substitute. This part is in active production status with ROHS3 compliance. It features enhanced quiescent current performance (200 µA versus 9 mA) and includes additional control features (Power Good output) and protection (Reverse Polarity, Under Voltage Lockout). The lower maximum input voltage (5.5V versus 7V) must be evaluated against system requirements.

MIC39301-1.8WU (Microchip Technology) is an alternative manufacturer option in active production with ROHS3 compliance. It supports a higher maximum input voltage (16V) and features lower dropout voltage (0.55V @ 3A) with reverse polarity protection.

Parametric Equivalents:

LP3853ESX-1.8/NOPB and LP3856ESX-1.8/NOPB (Texas Instruments) are direct parametric equivalents in active production status with ROHS3 compliance. Both deliver improved performance with lower dropout voltage (0.6V @ 3A) and reduced quiescent current (4 mA) compared to the original part.

LP3876ESX-1.8/NOPB (Texas Instruments) is an active production alternative with electrical characteristics closely matching the original part, featuring slightly reduced quiescent current (5 mA).

LP3873ESX-1.8/NOPB (National Semiconductor) matches the original part's electrical specifications exactly but lacks published RoHS status documentation.

LP3966ESX-1.8/NOPB (Texas Instruments) is the preferred long-term substitute, offering active production status with identical electrical performance to the original part and full ROHS3 compliance. The non-NOPB variant (LP3966ESX-1.8) is available but classified as Last Time Buy.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LP3963ESX-1.8 with any of these substitutes without PCB modifications?

A: Yes, all listed substitutes use the identical TO-263 (DDPAK-5) package with the same pinout and footprint. No PCB layout changes are required. However, verify that your system's maximum input voltage does not exceed the substitute part's rating, particularly for TPS75718KTTR (5.5V max) versus the original part's 7V maximum.

Q: What is the difference between LP3966ESX-1.8 and LP3966ESX-1.8/NOPB?

A: Both parts are electrically identical with the same electrical specifications. The /NOPB suffix indicates "No Lead (Pb)" and represents the current active production variant with full RoHS3 compliance. LP3966ESX-1.8 without the suffix is classified as Last Time Buy, meaning production is being discontinued. For new designs, specify LP3966ESX-1.8/NOPB.

Q: Why does TPS75718KTTR have a lower maximum input voltage (5.5V) than the original part (7V)?

A: TPS75718KTTR is designed for lower input voltage applications with enhanced performance features including Power Good output and additional protection mechanisms. System input voltage must not exceed 5.5V for this substitute. If your application requires 7V input capability, select LP3853ESX-1.8/NOPB, LP3856ESX-1.8/NOPB, LP3876ESX-1.8/NOPB, or LP3966ESX-1.8/NOPB.

Q: Which substitute offers the best performance improvement over the original LP3963ESX-1.8?

A: LP3853ESX-1.8/NOPB and LP3856ESX-1.8/NOPB deliver the most significant improvements with 50% lower dropout voltage (0.6V versus 1.2V @ 3A) and 55% lower quiescent current (4 mA versus 9 mA). These improvements reduce power dissipation and thermal load in the regulator.

Q: Are all substitutes RoHS3 compliant?

A: All listed substitutes except LP3873ESX-1.8/NOPB carry explicit ROHS3 compliance certification. LP3873ESX-1.8/NOPB does not have published RoHS status in the provided specifications.

Q: What packaging options are available for these substitutes?

A: All substitutes are supplied in TO-263 (DDPAK-5) surface mount packages. Packaging formats vary: TPS75718KTTR is supplied in Tape & Reel; LP3853ESX-1.8/NOPB, LP3856ESX-1.8/NOPB, LP3876ESX-1.8/NOPB, LP3966ESX-1.8, and LP3966ESX-1.8/NOPB are supplied in Tape & Reel; LP3873ESX-1.8/NOPB is supplied in Bulk; MIC39301-1.8WU is supplied in Tube.

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