LP3873ES-1.8/NOPB Equivalent & Substitute Parts

Part Overview

The LP3873ES-1.8/NOPB is a linear voltage regulator IC manufactured by Texas Instruments, classified as a Power Management (PMIC) component. This positive fixed output regulator delivers 3A at 1.8V and operates across an input voltage range up to 7V. The device is housed in a TO-263 (DDPAK-5) surface mount package and is currently in active production status with 825 units in stock.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter set, enabling direct replacement in circuit designs without functional degradation.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP3873ES-1.8/NOPB
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	1.8V
Output Current	3A
Input Voltage (Max)	7V
Voltage Dropout (Max)	1.2V @ 3A
Package / Case	TO-263 (DDPAK-5)
Operating Temperature Range	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters:

Output voltage configuration: 1.8V fixed positive output
Output current rating: 3A
Maximum input voltage: 7V
Package type: TO-263 (DDPAK-5) surface mount
Output configuration: Positive fixed single output
Protection features: Over Current, Over Temperature, Short Circuit
Operating temperature range: -40°C ~ 125°C
Control features: Enable function
RoHS compliance: ROHS3 Compliant

The LP3853ES-1.8/NOPB and LP3856ES-1.8/NOPB are classified as parametric equivalents with improved dropout voltage performance (0.6V @ 3A versus 1.2V @ 3A). The LP3966ES-1.8/NOPB maintains identical dropout voltage and quiescent current specifications to the main part.

Parameter Comparison

Parameter	LP3873ES-1.8/NOPB	LP3853ES-1.8/NOPB	LP3856ES-1.8/NOPB	LP3966ES-1.8/NOPB
Output Voltage (Fixed)	1.8V	1.8V	1.8V	1.8V
Output Current	3A	3A	3A	3A
Input Voltage (Max)	7V	7V	7V	7V
Voltage Dropout (Max)	1.2V @ 3A	0.6V @ 3A	0.6V @ 3A	1.2V @ 3A
Current - Quiescent (Iq)	9 mA	4 mA	4 mA	9 mA
Current - Supply (Max)	15 mA	10 mA	10 mA	15 mA
PSRR	73dB ~ 57dB (120Hz)	73dB ~ 57dB (120Hz)	73dB ~ 57dB (120Hz)	Not specified
Package / Case	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active
Inventory (Pcs)	825	1403	1017	1226

Engineering Selection Recommendations

All four parts maintain active product status and ROHS3 compliance, confirming ongoing manufacturer support and environmental regulatory alignment. The LP3853ES-1.8/NOPB and LP3856ES-1.8/NOPB offer reduced dropout voltage (0.6V @ 3A) and lower quiescent current (4 mA), providing efficiency advantages in applications with tight input-output voltage margins or extended battery runtime requirements. The LP3856ES-1.8/NOPB carries REACH Affected status, whereas the LP3873ES-1.8/NOPB, LP3853ES-1.8/NOPB, and LP3966ES-1.8/NOPB are REACH Unaffected. The LP3966ES-1.8/NOPB maintains electrical characteristics identical to the main part with the exception of PSRR data availability. All parts are packaged identically in TO-263 (DDPAK-5) format and support the same control and protection feature set.

Frequently Asked Questions (FAQ)

Q: Can LP3853ES-1.8/NOPB or LP3856ES-1.8/NOPB be used as direct replacements for LP3873ES-1.8/NOPB?

A: Yes. Both parts maintain identical output voltage (1.8V), output current (3A), input voltage rating (7V), package type (TO-263 DDPAK-5), and operating temperature range (-40°C ~ 125°C). The reduced dropout voltage and quiescent current represent performance improvements rather than functional incompatibilities.

Q: What is the difference between LP3853ES-1.8/NOPB and LP3856ES-1.8/NOPB?

A: Both parts are electrically identical with 0.6V dropout voltage and 4 mA quiescent current. The primary distinction is REACH compliance status: LP3856ES-1.8/NOPB is REACH Affected, while LP3853ES-1.8/NOPB is REACH Unaffected. Selection depends on supply chain and regulatory requirements.

Q: Is LP3966ES-1.8/NOPB compatible with the original LP3873ES-1.8/NOPB design?

A: Yes. LP3966ES-1.8/NOPB maintains identical dropout voltage (1.2V @ 3A), quiescent current (9 mA), and supply current (15 mA) specifications. PSRR data is not provided for this part. All other electrical and mechanical parameters align with the main part.

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

A: Yes. All four parts use the TO-263 (DDPAK-5) surface mount package with identical pinout and thermal characteristics, enabling direct PCB footprint compatibility.

Q: What compliance certifications apply to all substitute parts?

A: All parts are ROHS3 Compliant and maintain active product status. REACH compliance varies: LP3853ES-1.8/NOPB, LP3873ES-1.8/NOPB, and LP3966ES-1.8/NOPB are REACH Unaffected; LP3856ES-1.8/NOPB is REACH Affected.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message