LP3872EMPX-3.3 Linear Voltage Regulator — Equivalent & Substitute Parts

Part Overview

The LP3872EMPX-3.3 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 3.3V output at 1.5A in a SOT-223-5 surface mount package. This device is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support, production continuity, and component sourcing.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Output Voltage (Fixed)	3.3V
Output Current	1.5A
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.55V @ 1.5A
Quiescent Current	5 mA
Package Type	SOT-223-5
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 is determined by strict equivalence across the following parameters:

Output voltage: 3.3V fixed
Output current capability: 1.5A
Maximum input voltage: 7V
Package type: SOT-223-5
Protection features: Over Current, Over Temperature, Short Circuit
Control features: Enable function
Operating temperature range: -40°C to 125°C

All identified substitute parts meet these core electrical and mechanical requirements. Differences in quiescent current, voltage dropout characteristics, and product status are noted but do not disqualify substitution eligibility within the specified parameter constraints.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Voltage Dropout @ 1.5A	Quiescent Current	Product Status	RoHS Status	Packaging
LP3872EMPX-3.3	Texas Instruments	3.3V	1.5A	0.55V	5 mA	Obsolete	Non-compliant	SOT-223-5
LP3852EMP-3.3	Texas Instruments	3.3V	1.5A	0.44V	3 mA	Last Time Buy	ROHS3 Compliant	SOT-223-5
LP3852EMP-3.3/NOPB	Texas Instruments	3.3V	1.5A	0.44V	3 mA	Active	ROHS3 Compliant	SOT-223-5
LP3855EMP-3.3/NOPB	Texas Instruments	3.3V	1.5A	0.44V	3 mA	Active	ROHS3 Compliant	SOT-223-5
LP3872EMP-3.3/NOPB	Texas Instruments	3.3V	1.5A	0.55V	5 mA	Active	ROHS3 Compliant	SOT-223-5
LP3872EMPX-3.3/NOPB	Texas Instruments	3.3V	1.5A	0.55V	5 mA	Active	ROHS3 Compliant	SOT-223-5
LP3875EMP-3.3/NOPB	Texas Instruments	3.3V	1.5A	0.55V	5 mA	Active	ROHS3 Compliant	SOT-223-5
LP3962EMP-3.3	Texas Instruments	3.3V	1.5A	0.55V	9 mA	Last Time Buy	ROHS3 Compliant	SOT-223-5
LP3962EMP-3.3/NOPB	Texas Instruments	3.3V	1.5A	0.55V	9 mA	Active	ROHS3 Compliant	SOT-223-5
LP3965EMP-3.3/NOPB	Texas Instruments	3.3V	1.5A	0.55V	9 mA	Active	ROHS3 Compliant	SOT-223-5

Engineering Selection Recommendations

For designs currently using the obsolete LP3872EMPX-3.3, the following selection criteria apply:

Active Status Priority: LP3852EMP-3.3/NOPB, LP3855EMP-3.3/NOPB, LP3872EMP-3.3/NOPB, LP3872EMPX-3.3/NOPB, LP3875EMP-3.3/NOPB, LP3962EMP-3.3/NOPB, and LP3965EMP-3.3/NOPB are all in active production status, ensuring long-term availability and supply chain stability.

RoHS3 Compliance: All substitute parts listed are ROHS3 compliant, whereas the original LP3872EMPX-3.3 is non-compliant. This compliance status is relevant for applications subject to environmental regulations.

Dropout Voltage Consideration: LP3852EMP-3.3 and LP3855EMP-3.3/NOPB offer improved dropout performance (0.44V) compared to the original part (0.55V), resulting in lower power dissipation under load conditions.

Quiescent Current Variation: LP3852EMP-3.3 and LP3855EMP-3.3/NOPB feature reduced quiescent current (3 mA) versus the original (5 mA), beneficial for battery-powered or low-power standby applications. LP3962EMP-3.3 and LP3965EMP-3.3/NOPB operate at 9 mA quiescent current.

Packaging Availability: All substitute parts are available in Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel® packaging formats, supporting both manual and automated assembly workflows.

Frequently Asked Questions (FAQ)

Q: Can LP3852EMP-3.3/NOPB directly replace LP3872EMPX-3.3 in existing designs?

A: Yes. Both parts deliver 3.3V at 1.5A in SOT-223-5 packaging with identical input voltage limits, protection features, and operating temperature ranges. The LP3852EMP-3.3/NOPB offers superior dropout voltage (0.44V vs. 0.55V) and lower quiescent current (3 mA vs. 5 mA), making it functionally superior for the same application.

Q: What is the difference between LP3872EMP-3.3/NOPB and LP3872EMPX-3.3/NOPB?

A: Both parts are electrically identical with 0.55V dropout and 5 mA quiescent current. The primary difference is packaging format: LP3872EMP-3.3/NOPB is supplied in Cut Tape (CT) & Digi-Reel® format, while LP3872EMPX-3.3/NOPB is supplied in Tape & Reel (TR) format. Selection depends on assembly equipment compatibility.

Q: Why do some substitute parts show "Last Time Buy" status?

A: LP3852EMP-3.3 and LP3962EMP-3.3 are designated Last Time Buy, indicating these specific part numbers will no longer be manufactured after a defined cutoff date. For new designs or long-term production, select parts with Active status.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitute parts are ROHS3 compliant. The original LP3872EMPX-3.3 is RoHS non-compliant, making the substitutes necessary for applications requiring environmental compliance certification.

Q: Does quiescent current variation affect circuit performance?

A: Quiescent current differences (3 mA, 5 mA, or 9 mA) impact standby power consumption and thermal dissipation. For applications with strict power budgets or thermal constraints, LP3852EMP-3.3/NOPB or LP3855EMP-3.3/NOPB are preferred due to lower quiescent current. For general-purpose applications, all variants are functionally equivalent.

Q: Can I mix packaging formats in production?

A: Packaging format selection (Tape & Reel vs. Cut Tape & Digi-Reel) is determined by assembly equipment and workflow requirements, not electrical performance. Verify compatibility with your manufacturing process before implementation.

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