LP3876ES-1.8 Linear Voltage Regulator: Equivalent & Substitute Parts

Part Overview

The LP3876ES-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 3A maximum current in a TO-263 (DDPAK-5) surface mount package. The main part number LP3876ES-1.8 is currently listed as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	1.8V
Output Current	3A
Input Voltage (Max)	7V
Package Type	TO-263 (DDPAK-5)
Mounting Type	Surface Mount
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution eligibility for the LP3876ES-1.8 is determined by the following critical parameters:

Fixed output voltage of 1.8V
3A maximum output current capability
Maximum input voltage of 7V
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

Five active substitute parts meet these core electrical and mechanical requirements. Variations in dropout voltage, quiescent current, and PSRR performance do not disqualify parts from functional substitution, as these parameters remain within acceptable ranges for the specified application class.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage @ 3A	Quiescent Current	Package	Product Status	RoHS Status
LP3876ES-1.8	Texas Instruments	1.8V	3A	7V	1.2V	5 mA	TO-263 (DDPAK-5)	Obsolete	RoHS Non-Compliant
LP3876ES-1.8/NOPB	Texas Instruments	1.8V	3A	7V	1.2V	5 mA	TO-263 (DDPAK-5)	Active	ROHS3 Compliant
LP3853ES-1.8/NOPB	Texas Instruments	1.8V	3A	7V	0.6V	4 mA	TO-263 (DDPAK-5)	Active	ROHS3 Compliant
LP3856ES-1.8/NOPB	Texas Instruments	1.8V	3A	7V	0.6V	4 mA	TO-263 (DDPAK-5)	Active	ROHS3 Compliant
LP3873ES-1.8/NOPB	Texas Instruments	1.8V	3A	7V	1.2V	9 mA	TO-263 (DDPAK-5)	Active	ROHS3 Compliant
LP3966ES-1.8/NOPB	Texas Instruments	1.8V	3A	7V	1.2V	9 mA	TO-263 (DDPAK-5)	Active	ROHS3 Compliant

Engineering Selection Recommendations

All five substitute parts are active products from Texas Instruments and maintain identical electrical specifications for output voltage, output current, and input voltage ratings. The primary distinction between substitutes lies in product compliance status and performance characteristics.

LP3876ES-1.8/NOPB is the direct equivalent with ROHS3 compliance and identical electrical performance to the obsolete main part number. This part is recommended as the primary replacement for existing LP3876ES-1.8 designs.

LP3853ES-1.8/NOPB and LP3856ES-1.8/NOPB offer improved dropout voltage performance (0.6V versus 1.2V at 3A) and lower quiescent current (4 mA versus 5 mA), making these suitable for applications requiring enhanced efficiency. Both parts carry ROHS3 compliance.

LP3873ES-1.8/NOPB and LP3966ES-1.8/NOPB maintain the 1.2V dropout voltage specification but feature higher quiescent current (9 mA). Both parts are ROHS3 compliant and functionally equivalent to the main part number.

All substitute parts are packaged in Tube format and maintain the TO-263 (DDPAK-5) surface mount configuration, ensuring direct PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can LP3876ES-1.8/NOPB directly replace the obsolete LP3876ES-1.8?

A: Yes. LP3876ES-1.8/NOPB is the active equivalent with identical electrical specifications, package configuration, and pinout. The primary difference is ROHS3 compliance status. No circuit modifications are required.

Q: What is the difference between LP3853ES-1.8/NOPB and LP3873ES-1.8/NOPB?

A: Both parts deliver 1.8V at 3A in the same package. LP3853ES-1.8/NOPB features lower dropout voltage (0.6V) and quiescent current (4 mA), while LP3873ES-1.8/NOPB maintains 1.2V dropout voltage with 9 mA quiescent current. Selection depends on power budget and input voltage margin requirements.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts use the TO-263 (DDPAK-5) surface mount package with identical pinout and mechanical dimensions. Direct PCB substitution is possible without layout changes.

Q: Do the substitute parts have the same protection features?

A: Yes. All substitute parts include over current, over temperature, and short circuit protection with enable control functionality, matching the main part specification.

Q: What is the significance of the /NOPB suffix?

A: The /NOPB designation indicates the part is supplied without lead (Pb) and is compliant with RoHS3 regulations. This is the current standard packaging format from Texas Instruments.

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