LP3965EMPX-3.3 Equivalent & Substitute Parts

Part Overview

The LP3965EMPX-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output applications. This Surface Mount device delivers 1.5A output current in a SOT-223-5 package and includes integrated protection features for over-current, over-temperature, and short-circuit conditions. The part is classified as Obsolete, making identification of equivalent and substitute components essential for ongoing design support, production continuity, and system maintenance.

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 (Iq)	9 mA
Supply Current (Max)	15 mA
Operating Temperature Range	-40°C to 125°C
Package Type	SOT-223-5 (TO-261-5, TO-261AB)
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitute parts for the LP3965EMPX-3.3 are qualified based on the following electrical and mechanical parameters:

Fixed output voltage of 3.3V
Output current capability of 1.5A
Maximum input voltage of 7V
SOT-223-5 package compatibility
Identical protection features (Over Current, Over Temperature, Short Circuit)
Enable control functionality
Operating temperature range of -40°C to 125°C
Surface mount configuration

Parts meeting these criteria are grouped into two categories: those with improved quiescent current performance (3 mA to 5 mA) and those matching the original 9 mA specification. Voltage dropout characteristics vary between 0.44V and 0.55V at 1.5A, with lower dropout variants offering enhanced efficiency in power-constrained applications.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout @ 1.5A	Iq (mA)	Supply Current (Max)	Package	Product Status	RoHS Status
LP3965EMPX-3.3	Texas Instruments	3.3V	1.5A	7V	0.55V	9	15 mA	SOT-223-5	Obsolete	Non-compliant
LP3852EMP-3.3	Texas Instruments	3.3V	1.5A	7V	0.44V	3	10 mA	SOT-223-5	Last Time Buy	ROHS3 Compliant
LP3852EMP-3.3/NOPB	Texas Instruments	3.3V	1.5A	7V	0.44V	3	10 mA	SOT-223-5	Active	ROHS3 Compliant
LP3855EMP-3.3/NOPB	Texas Instruments	3.3V	1.5A	7V	0.44V	3	10 mA	SOT-223-5	Active	ROHS3 Compliant
LP3872EMP-3.3/NOPB	Texas Instruments	3.3V	1.5A	7V	0.55V	5	15 mA	SOT-223-5	Active	ROHS3 Compliant
LP3872EMPX-3.3/NOPB	Texas Instruments	3.3V	1.5A	7V	0.55V	5	15 mA	SOT-223-5	Active	ROHS3 Compliant
LP3875EMP-3.3/NOPB	Texas Instruments	3.3V	1.5A	7V	0.55V	5	15 mA	SOT-223-5	Active	ROHS3 Compliant
LP3962EMP-3.3	Texas Instruments	3.3V	1.5A	7V	0.55V	9	15 mA	SOT-223-5	Last Time Buy	ROHS3 Compliant
LP3962EMP-3.3/NOPB	Texas Instruments	3.3V	1.5A	7V	0.55V	9	15 mA	SOT-223-5	Active	ROHS3 Compliant
LP3965EMP-3.3/NOPB	Texas Instruments	3.3V	1.5A	7V	0.55V	9	15 mA	SOT-223-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

For applications requiring direct replacement of the obsolete LP3965EMPX-3.3, the LP3965EMP-3.3/NOPB is the primary equivalent, offering identical electrical specifications with Active product status and ROHS3 compliance. This part maintains the 0.55V dropout voltage and 9 mA quiescent current of the original design.

For new designs or applications where power efficiency is prioritized, the LP3852EMP-3.3/NOPB and LP3855EMP-3.3/NOPB variants provide superior performance with reduced quiescent current (3 mA) and lower dropout voltage (0.44V), while maintaining full compatibility with the SOT-223-5 package and all protection features. Both are Active status parts with ROHS3 compliance.

The LP3872EMP-3.3/NOPB, LP3872EMPX-3.3/NOPB, and LP3875EMP-3.3/NOPB represent intermediate options with improved quiescent current (5 mA) relative to the original specification while maintaining the 0.55V dropout characteristic. All three are Active status with ROHS3 compliance.

Parts designated as Last Time Buy (LP3852EMP-3.3 and LP3962EMP-3.3) remain available but should not be selected for new production designs due to limited future availability.

Frequently Asked Questions (FAQ)

Q: Can LP3852EMP-3.3/NOPB directly replace LP3965EMPX-3.3?

A: Yes. Both devices deliver 1.5A at 3.3V output in SOT-223-5 packages with identical protection features and operating temperature ranges. The LP3852EMP-3.3/NOPB offers improved performance with lower dropout voltage (0.44V vs. 0.55V) and reduced quiescent current (3 mA vs. 9 mA).

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

A: Both parts are electrically identical with 1.5A output, 3.3V fixed voltage, and SOT-223-5 packaging. The difference lies in packaging format: LP3872EMP-3.3/NOPB is supplied in Tape & Reel, while LP3872EMPX-3.3/NOPB is also available in Tape & Reel configuration. Verify packaging requirements with your procurement specification.

Q: Why do some substitute parts have lower quiescent current?

A: The LP3852EMP-3.3/NOPB, LP3855EMP-3.3/NOPB, and LP3872 variants incorporate improved internal design, reducing standby power consumption from 9 mA to 3-5 mA. This enhancement benefits battery-powered and low-power applications without affecting output current capability or voltage regulation performance.

Q: Are all substitute parts RoHS compliant?

A: The original LP3965EMPX-3.3 is RoHS non-compliant. All listed substitute parts are ROHS3 compliant, meeting current environmental regulations. This compliance is mandatory for most commercial and industrial applications.

Q: Can I use LP3962EMP-3.3 in production?

A: LP3962EMP-3.3 is designated Last Time Buy status, indicating limited future availability. For new production designs, select Active status alternatives such as LP3962EMP-3.3/NOPB, LP3965EMP-3.3/NOPB, or the improved LP3852EMP-3.3/NOPB variant.

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

A: The /NOPB designation indicates lead-free, RoHS-compliant packaging. Parts without this suffix may contain lead and are subject to restricted availability. For new designs, specify /NOPB variants to ensure compliance and long-term supply continuity.

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