LP3964EMP-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3964EMP-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 Last Time Buy, indicating production discontinuation. The part operates across an input voltage range up to 7V with adjustable output from 1.216V to 5.1V, making it suitable for various power management applications requiring regulated positive voltage rails.

Due to its Last Time Buy status, identifying parametrically equivalent alternatives ensures design continuity and supply chain reliability for ongoing production requirements.

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
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	TO-261-5, TO-261AB
Supplier Device Package	SOT-223-5
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LP3964EMP-ADJ is determined by strict parametric matching across the following critical criteria:

Electrical Parameters: Output configuration (Positive), output type (Adjustable), number of regulators (1), maximum input voltage (7V), output voltage range (1.216V to 5.1V), output current (800mA), and maximum dropout voltage (0.35V @ 800mA).

Environmental & Compliance Parameters: Operating temperature range (-40°C ~ 125°C), RoHS3 compliance, MSL rating (1 - Unlimited), and REACH status (REACH Unaffected).

Physical Parameters: Mounting type (Surface Mount), package designation (TO-261-5, TO-261AB), and supplier device package (SOT-223-5).

The identified substitute parts maintain identical electrical performance specifications and environmental compliance certifications, ensuring functional and regulatory equivalence for direct replacement applications.

Parameter Comparison

Parameter	LP3964EMP-ADJ	LP3964EMP-ADJ/NOPB	LP3964EMPX-ADJ/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Category	Power Management (PMIC)	Power Management (PMIC)	Power Management (PMIC)
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
Current - Supply (Max)	15 mA	15 mA	15 mA
Control Features	Enable	Enable	Enable
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Last Time Buy	Active	Active
Packaging Option	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)

Engineering Selection Recommendations

The LP3964EMP-ADJ is designated Last Time Buy, indicating end-of-life status. Both substitute parts—LP3964EMP-ADJ/NOPB and LP3964EMPX-ADJ/NOPB—maintain Active product status with Texas Instruments and are recommended for new designs and ongoing production requirements.

LP3964EMP-ADJ/NOPB is available in Cut Tape (CT) and Digi-Reel® packaging, matching the original part's packaging options. This variant is suitable for applications requiring standard tape and reel distribution.

LP3964EMPX-ADJ/NOPB is supplied exclusively in Tape & Reel (TR) format, optimized for high-volume automated assembly processes. Selection between these two variants depends on production volume and assembly line requirements rather than electrical performance, as both deliver identical functional specifications.

All three parts maintain ROHS3 compliance, MSL Level 1 (Unlimited moisture sensitivity), and REACH Unaffected status, ensuring regulatory compatibility across global markets.

Frequently Asked Questions (FAQ)

Q: Can LP3964EMP-ADJ/NOPB directly replace LP3964EMP-ADJ in existing designs?

A: Yes. Both parts are parametrically equivalent across all electrical, thermal, and mechanical specifications. The /NOPB suffix indicates lead-free plating compliance. Direct substitution is supported without circuit modification.

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

A: The primary difference is packaging format. LP3964EMP-ADJ/NOPB is available in Cut Tape and Digi-Reel® options, while LP3964EMPX-ADJ/NOPB is supplied in Tape & Reel format. Electrical performance and compliance certifications are identical. Selection depends on assembly process requirements and volume.

Q: Why is the original LP3964EMP-ADJ marked Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has discontinued production of this specific part number variant. Substitute parts with Active status ensure continued availability and supply chain stability for new production runs.

Q: Are all three parts compatible with the same PCB layout and footprint?

A: Yes. All three parts use identical package designations (TO-261-5, TO-261AB) and SOT-223-5 supplier device package specifications, ensuring footprint compatibility without PCB redesign.

Q: Do these parts require different handling or storage procedures?

A: No. All three parts share identical Moisture Sensitivity Level (MSL) ratings of 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard ESD handling procedures apply uniformly across all variants.

Q: Can LP3964EMPX-ADJ/NOPB be used in low-volume or prototype applications?

A: LP3964EMPX-ADJ/NOPB is supplied in Tape & Reel format, which is optimized for high-volume automated assembly. For low-volume or prototype work, LP3964EMP-ADJ/NOPB in Cut Tape format is the more practical choice.

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