LP3853ET-3.3 Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The LP3853ET-3.3 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed 3.3V output at 3A maximum current in a TO-220-5 package configuration. The main part is currently listed as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations. Equivalent and substitute parts maintain the same electrical performance characteristics and mechanical compatibility required for direct replacement in existing applications.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	3A
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.6V @ 3A
Quiescent Current	4 mA
Package Type	TO-220-5 Formed Leads
Mounting Type	Through Hole
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 LP3853ET-3.3 is determined by strict equivalence across the following critical parameters: fixed output voltage of 3.3V, maximum output current of 3A, maximum input voltage of 7V, TO-220-5 package configuration, through-hole mounting type, and operating temperature range of -40°C to 125°C. All identified substitute parts maintain these core electrical and mechanical specifications, ensuring functional compatibility in applications originally designed for the LP3853ET-3.3.

The substitute parts are categorized as follows:

Direct Manufacturer Equivalent: LP3853ET-3.3/NOPB maintains identical specifications with updated RoHS3 compliance and active product status.

Parametric Equivalents: LP3856ET-3.3/NOPB and LP3876ET-3.3/NOPB deliver the same output voltage, current rating, and package configuration. LP3876ET-3.3/NOPB is manufactured by National Semiconductor and exhibits higher dropout voltage (1.2V @ 3A) and quiescent current (5 mA) compared to the main part specifications.

Parameter Comparison

Parameter	LP3853ET-3.3	LP3853ET-3.3/NOPB	LP3856ET-3.3/NOPB	LP3876ET-3.3/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	National Semiconductor
Product Status	Obsolete	Active	Active	Active
Output Voltage	3.3V	3.3V	3.3V	3.3V
Output Current	3A	3A	3A	3A
Input Voltage (Max)	7V	7V	7V	7V
Voltage Dropout (Max)	0.6V @ 3A	0.6V @ 3A	0.6V @ 3A	1.2V @ 3A
Quiescent Current	4 mA	4 mA	4 mA	5 mA
Package / Case	TO-220-5 Formed Leads	TO-220-5 Formed Leads	TO-220-5 Formed Leads	TO-220-5 Formed Leads
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

LP3853ET-3.3/NOPB is the primary substitute for obsolete LP3853ET-3.3 applications. This part is manufactured by Texas Instruments with active product status and ROHS3 compliance, providing direct functional replacement with improved regulatory alignment.

LP3856ET-3.3/NOPB serves as an alternative parametric equivalent from Texas Instruments with active product status and ROHS3 compliance. Electrical performance matches the main part across all critical parameters.

LP3876ET-3.3/NOPB from National Semiconductor is a parametric equivalent suitable for applications where the higher dropout voltage (1.2V @ 3A) and increased quiescent current (5 mA) are acceptable within system design margins. This part maintains active product status and identical package configuration.

Selection should prioritize LP3853ET-3.3/NOPB for direct replacement requirements. Alternative selections depend on component availability, supply chain considerations, and system-level tolerance for the specified parameter variations.

Frequently Asked Questions (FAQ)

Q: Can LP3853ET-3.3/NOPB directly replace the obsolete LP3853ET-3.3?

A: Yes. LP3853ET-3.3/NOPB maintains identical electrical specifications including 3.3V fixed output, 3A maximum current, 0.6V dropout voltage at 3A, and TO-220-5 package configuration. The primary difference is active product status and ROHS3 compliance.

Q: What is the difference between LP3856ET-3.3/NOPB and LP3876ET-3.3/NOPB?

A: Both parts deliver 3.3V at 3A in TO-220-5 packages. LP3856ET-3.3/NOPB is manufactured by Texas Instruments with 0.6V dropout voltage and 4 mA quiescent current. LP3876ET-3.3/NOPB is manufactured by National Semiconductor with 1.2V dropout voltage and 5 mA quiescent current. Selection depends on system tolerance for these parameter variations.

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

A: Yes. All substitute parts use TO-220-5 Formed Leads package with through-hole mounting, ensuring mechanical compatibility with existing PCB layouts designed for LP3853ET-3.3.

Q: What compliance certifications apply to these substitute parts?

A: LP3853ET-3.3/NOPB and LP3856ET-3.3/NOPB are ROHS3 compliant. All parts are REACH unaffected and classified under ECCN EAR99 with HTSUS code 8542.39.0001.

Q: How do dropout voltage differences affect component selection?

A: Dropout voltage determines the minimum input-to-output voltage differential required for regulation. LP3853ET-3.3 and LP3856ET-3.3/NOPB require 0.6V minimum differential at 3A. LP3876ET-3.3/NOPB requires 1.2V minimum differential. System input voltage must exceed output voltage plus dropout voltage to maintain regulation.

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