LP3964ET-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3964ET-ADJ is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This device delivers 800mA output current in a TO-220-5 package and is classified as obsolete. Due to its obsolete status, identifying equivalent and substitute parts is essential for design continuity, production planning, and system maintenance. The substitute part maintains identical electrical specifications while offering improved availability and compliance status.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Package Type	TO-220-5 Formed Leads
Output Configuration	Positive
Output Type	Adjustable
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 Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
Mounting Type	Through Hole

Substitute Part Grouping Explanation

The LP3964ET-ADJ/NOPB qualifies as a direct substitute based on the following criteria:

Electrical Parameter Equivalence:

Identical input voltage maximum (7V)
Identical output voltage range (1.216V to 5.1V adjustable)
Identical output current rating (800mA)
Identical dropout voltage specification (0.35V @ 800mA)
Identical quiescent current (9mA)
Identical protection features (Over Current, Over Temperature, Short Circuit)
Identical control features (Enable function)
Identical operating temperature range (-40°C to 125°C)

Mechanical Parameter Equivalence:

Identical package type (TO-220-5 Formed Leads)
Identical mounting type (Through Hole)
Identical base product number (LP3964)

Compliance Improvement:

LP3964ET-ADJ/NOPB is Active product status versus Obsolete
LP3964ET-ADJ/NOPB is RoHS3 Compliant versus RoHS non-compliant

Parameter Comparison

Parameter	LP3964ET-ADJ	LP3964ET-ADJ/NOPB
Manufacturer	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active
Voltage - Input (Max)	7V	7V
Voltage - Output (Min/Fixed)	1.216V	1.216V
Voltage - Output (Max)	5.1V	5.1V
Current - Output	800mA	800mA
Voltage Dropout (Max)	0.35V @ 800mA	0.35V @ 800mA
Current - Quiescent (Iq)	9mA	9mA
Operating Temperature	-40°C to 125°C	-40°C to 125°C
Package / Case	TO-220-5 Formed Leads	TO-220-5 Formed Leads
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
RoHS Status	RoHS non-compliant	RoHS3 Compliant
Packaging	-	Tube

Engineering Selection Recommendations

The LP3964ET-ADJ/NOPB is the direct substitute for the obsolete LP3964ET-ADJ. Selection of the substitute part is based on:

Product Status: The LP3964ET-ADJ/NOPB maintains Active product status, ensuring continued availability and manufacturer support, whereas the original part is Obsolete.

Regulatory Compliance: The LP3964ET-ADJ/NOPB is RoHS3 Compliant, meeting current environmental and regulatory requirements. The original part is RoHS non-compliant, which may present compliance challenges for new designs or production batches.

Electrical and Mechanical Compatibility: All electrical parameters, protection features, control features, and mechanical specifications are identical between the two parts. Pin configuration, package footprint, and thermal characteristics remain unchanged.

Certification Status: Both parts maintain REACH Unaffected status and identical ECCN and HTSUS classifications, ensuring no change in export or supply chain documentation.

Frequently Asked Questions (FAQ)

Q: Can LP3964ET-ADJ/NOPB be used as a direct replacement for LP3964ET-ADJ?

A: Yes. The LP3964ET-ADJ/NOPB is a direct substitute. All electrical specifications, output characteristics, protection features, and package dimensions are identical. No circuit modifications or PCB redesign is required.

Q: What is the difference between LP3964ET-ADJ and LP3964ET-ADJ/NOPB?

A: The primary differences are product status and RoHS compliance. LP3964ET-ADJ/NOPB is Active and RoHS3 Compliant, while LP3964ET-ADJ is Obsolete and RoHS non-compliant. The "/NOPB" suffix indicates lead-free plating. Electrical and mechanical specifications are identical.

Q: Are there any pin configuration differences?

A: No. Both parts use the TO-220-5 Formed Leads package with identical pinout and mechanical footprint. Direct PCB compatibility is confirmed.

Q: What is the packaging difference?

A: LP3964ET-ADJ/NOPB is supplied in Tube packaging, whereas the original part packaging is not specified. This affects handling and storage but does not impact electrical performance or compatibility.

Q: Is the output voltage range the same?

A: Yes. Both parts provide adjustable output voltage from 1.216V to 5.1V with identical dropout voltage of 0.35V @ 800mA and identical output current rating of 800mA.

Q: Are thermal and operating temperature specifications identical?

A: Yes. Both parts operate across -40°C to 125°C and include identical over-temperature protection. Thermal performance and derating characteristics remain unchanged.

Q: Does RoHS3 compliance affect circuit performance?

A: No. RoHS3 compliance relates to material composition and environmental standards. Electrical performance, specifications, and functionality are unaffected.

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