LP3872ET-3.3/NOPB Equivalent & Substitute Parts

Part Overview

The LP3872ET-3.3/NOPB 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 1.5A in a TO-220-5 package configuration. The part is currently listed as obsolete, making identification of equivalent and substitute parts essential for design continuity and procurement planning. Substitute parts maintain identical electrical specifications and mechanical compatibility while offering active product status or improved availability.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	1.5A
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.55V @ 1.5A
Quiescent Current (Iq)	5 mA
Package / Case	TO-220-5 Formed Leads
Operating Temperature Range	-40°C ~ 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 LP3872ET-3.3/NOPB is determined by the following criteria:

Primary Substitution Parameters:

Output voltage: 3.3V fixed
Output current capability: 1.5A
Maximum input voltage: 7V
Package type: TO-220-5 Formed Leads
Operating temperature range: -40°C ~ 125°C
Protection features: Over Current, Over Temperature, Short Circuit
Control features: Enable function

Secondary Compatibility Parameters:

Voltage dropout characteristics
Quiescent current consumption
PSRR (Power Supply Rejection Ratio) where specified
Product status and compliance certifications

All substitute parts listed maintain identical primary parameters. Variations in secondary parameters (dropout voltage, quiescent current, PSRR) do not affect functional compatibility in applications designed for the LP3872ET-3.3/NOPB specifications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Dropout @ 1.5A	Quiescent Current (Iq)	Supply Current (Max)	PSRR (120Hz)	Packaging	Inventory
LP3872ET-3.3/NOPB	Texas Instruments	Obsolete	0.55V	5 mA	15 mA	73dB ~ 57dB	Bulk	975 Pcs
LP3852ET-3.3/NOPB	National Semiconductor	Active	0.38V	3 mA	10 mA	73dB ~ 57dB	Bulk	1098 Pcs
LP3855ET-3.3/NOPB	Texas Instruments	Active	0.38V	3 mA	10 mA	73dB ~ 57dB	Tube	730 Pcs
LP3875ET-3.3/NOPB	Texas Instruments	Active	0.55V	5 mA	15 mA	73dB ~ 57dB	Tube	1163 Pcs
LP3962ET-3.3/NOPB	Texas Instruments	Active	0.55V	9 mA	15 mA	Not Specified	Tube	1106 Pcs
LP3962ET-3.3/LB05	Texas Instruments	Last Time Buy	0.55V	9 mA	15 mA	Not Specified	Tube	855 Pcs
LP3965ET-3.3/NOPB	Texas Instruments	Active	0.55V	9 mA	15 mA	Not Specified	Tube	1142 Pcs

Engineering Selection Recommendations

For Active Product Status Priority: LP3855ET-3.3/NOPB and LP3875ET-3.3/NOPB are recommended as primary substitutes. Both are active products from Texas Instruments with full product support. LP3855ET-3.3/NOPB offers improved dropout voltage (0.38V) and lower quiescent current (3 mA), resulting in reduced power dissipation. LP3875ET-3.3/NOPB maintains electrical characteristics identical to the obsolete LP3872ET-3.3/NOPB.

For Compliance and Certification: All substitute parts maintain ROHS3 compliance and EAR99 ECCN classification. LP3852ET-3.3/NOPB from National Semiconductor provides an alternative source with active status and superior dropout performance (0.38V).

For Availability and Inventory: LP3875ET-3.3/NOPB (1163 Pcs), LP3962ET-3.3/NOPB (1106 Pcs), and LP3965ET-3.3/NOPB (1142 Pcs) offer the highest inventory levels. LP3962ET-3.3/LB05 is designated Last Time Buy and should be avoided for new designs requiring long-term supply assurance.

For Quiescent Current Sensitivity: Applications requiring minimal standby power consumption should prioritize LP3852ET-3.3/NOPB or LP3855ET-3.3/NOPB, both with 3 mA quiescent current versus 5-9 mA in other alternatives.

Frequently Asked Questions (FAQ)

Q: Can LP3852ET-3.3/NOPB directly replace LP3872ET-3.3/NOPB? A: Yes. Both devices deliver 3.3V at 1.5A in TO-220-5 packages with identical operating temperature ranges and protection features. LP3852ET-3.3/NOPB offers superior dropout voltage (0.38V vs 0.55V) and lower quiescent current (3 mA vs 5 mA), making it functionally compatible with improved performance characteristics.

Q: What is the difference between LP3875ET-3.3/NOPB and LP3855ET-3.3/NOPB? A: Both are active Texas Instruments products in TO-220-5 packages. LP3875ET-3.3/NOPB matches the original LP3872ET-3.3/NOPB electrical specifications (0.55V dropout, 5 mA Iq). LP3855ET-3.3/NOPB provides enhanced performance with 0.38V dropout and 3 mA quiescent current. Packaging differs: LP3875ET-3.3/NOPB ships in Tube; LP3855ET-3.3/NOPB also ships in Tube.

Q: Why should LP3962ET-3.3/LB05 be avoided? A: This part is designated Last Time Buy, indicating discontinued production. New designs should use active products with ongoing manufacturer support. LP3962ET-3.3/NOPB (active status) is available as an alternative if the LP3962 series is required.

Q: Are there packaging considerations for substitution? A: All substitute parts use TO-220-5 Formed Leads packages with identical mechanical compatibility. Packaging format (Bulk vs Tube) affects handling and storage but does not impact electrical performance or PCB mounting.

Q: Does quiescent current variation affect circuit design? A: Quiescent current ranges from 3 mA to 9 mA across substitutes. In applications with continuous power draw, this variation is negligible. For battery-powered or ultra-low-power standby applications, LP3852ET-3.3/NOPB or LP3855ET-3.3/NOPB (3 mA) are preferred over LP3962 variants (9 mA).

Q: What compliance certifications apply to all substitutes? A: All parts are ROHS3 compliant and classified as EAR99 for export control. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all devices, indicating no special moisture handling requirements during storage or assembly.

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