LP3964EMPX-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3964EMPX-ADJ is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This Surface Mount device delivers 800mA output current in a compact SOT-223-5 package and is classified as Obsolete. Due to its obsolete status, identifying equivalent and substitute parts is essential for design continuity, production planning, and component sourcing in applications requiring positive adjustable voltage regulation with 800mA capacity.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Adjustable
Number of Regulators	1
Voltage - Input (Max)	7V
Voltage - Output (Min/Fixed)	1.216V
Voltage - Output (Max)	5.1V
Current - Output	800mA
Voltage Dropout (Max)	0.35V @ 800mA
Current - Quiescent (Iq)	9 mA
Operating Temperature	-40°C ~ 125°C
Package / Case	TO-261-5, TO-261AB
Supplier Device Package	SOT-223-5
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitute parts for the LP3964EMPX-ADJ are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

Output Configuration: Positive
Output Type: Adjustable
Number of Regulators: 1
Voltage - Input (Max): 7V
Voltage - Output (Min/Fixed): 1.216V
Voltage - Output (Max): 5.1V
Current - Output: 800mA
Voltage Dropout (Max): 0.35V @ 800mA
Package / Case: TO-261-5, TO-261AB
Supplier Device Package: SOT-223-5
Mounting Type: Surface Mount
Protection Features: Over Current, Over Temperature, Short Circuit
Control Features: Enable

All identified substitute parts maintain identical electrical specifications and mechanical compatibility with the main part number, ensuring direct functional replacement in existing designs.

Parameter Comparison

Parameter	LP3964EMPX-ADJ	LP3964EMPX-ADJ/NOPB	LP3964EMP-ADJ/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Output Configuration	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable
Number of Regulators	1	1	1
Voltage - Input (Max)	7V	7V	7V
Voltage - Output (Min/Fixed)	1.216V	1.216V	1.216V
Voltage - Output (Max)	5.1V	5.1V	5.1V
Current - Output	800mA	800mA	800mA
Voltage Dropout (Max)	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA
Current - Quiescent (Iq)	9 mA	9 mA	9 mA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	TO-261-5, TO-261AB	TO-261-5, TO-261AB	TO-261-5, TO-261AB
Supplier Device Package	SOT-223-5	SOT-223-5	SOT-223-5
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Control Features	Enable	Enable	Enable
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

LP3964EMPX-ADJ/NOPB is the primary substitute for the obsolete LP3964EMPX-ADJ. This part maintains identical electrical and mechanical specifications while offering Active product status and ROHS3 compliance. The /NOPB designation indicates lead-free construction, aligning with current environmental and regulatory standards.

LP3964EMP-ADJ/NOPB is a parametric equivalent offering identical functional performance and electrical characteristics. This part also carries Active status and ROHS3 compliance. The variant designation reflects manufacturing differences that do not affect electrical or mechanical compatibility.

Both substitute parts are suitable for direct replacement in applications currently using the LP3964EMPX-ADJ. The transition from Obsolete to Active status ensures long-term component availability and supply chain stability. ROHS3 compliance of substitute parts addresses regulatory requirements for new designs and production runs.

Frequently Asked Questions (FAQ)

Q: Can LP3964EMPX-ADJ/NOPB directly replace LP3964EMPX-ADJ in existing designs?

A: Yes. Both parts share identical electrical specifications, output configuration, current rating, voltage parameters, and SOT-223-5 package. No circuit modifications are required for direct substitution.

Q: What is the difference between LP3964EMPX-ADJ/NOPB and LP3964EMP-ADJ/NOPB?

A: Both parts are parametric equivalents with identical electrical and mechanical characteristics. The variant designations reflect internal manufacturing differences that do not affect functional performance or compatibility. Selection between these parts depends on availability and packaging options.

Q: Why is the main part number LP3964EMPX-ADJ classified as Obsolete?

A: Obsolete status indicates the part is no longer in active production. The substitute parts LP3964EMPX-ADJ/NOPB and LP3964EMP-ADJ/NOPB maintain Active status and are recommended for new designs and ongoing production requirements.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both LP3964EMPX-ADJ/NOPB and LP3964EMP-ADJ/NOPB are ROHS3 compliant, whereas the original LP3964EMPX-ADJ is RoHS non-compliant. This compliance improvement supports regulatory requirements in current manufacturing environments.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in Cut Tape (CT) and Digi-Reel packaging formats, as well as Tape & Reel (TR) configurations. Packaging selection depends on production volume and assembly requirements.

Q: Are there any electrical performance differences between the main part and substitutes?

A: No. All three parts maintain identical electrical specifications including 800mA output current, 7V maximum input voltage, 1.216V to 5.1V output range, 0.35V maximum dropout voltage, and identical protection features.

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