LP3964ESX-3.3 Equivalent & Substitute Parts

Part Overview

The LP3964ESX-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output applications. This Surface Mount device delivers 800mA output current in a TO-263 (DDPAK-5) package and includes integrated protection features for over-current, over-temperature, and short-circuit conditions. The main part number LP3964ESX-3.3 is currently listed as obsolete, making identification of active equivalent parts essential for ongoing production and design continuity.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	800mA
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.35V @ 800mA
Quiescent Current (Iq)	9mA (main part)
Supply Current (Max)	15mA
Operating Temperature Range	-40°C to 125°C
Package Type	TO-263-6 (DDPAK-5)
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution eligibility for the LP3964ESX-3.3 is determined by the following critical parameters:

Output voltage fixed at 3.3V
Output current capability of 800mA
Maximum input voltage of 7V
Voltage dropout specification of 0.35V @ 800mA
Operating temperature range of -40°C to 125°C
Package configuration TO-263-6 (DDPAK-5)
Identical protection features (Over Current, Over Temperature, Short Circuit)
Enable control feature availability

All substitute parts listed maintain these core electrical and mechanical specifications, ensuring functional compatibility in applications designed for the LP3964ESX-3.3.

Parameter Comparison

Parameter	LP3964ESX-3.3	LP3871ESX-3.3/NOPB	LP3961ESX-3.3/NOPB	LP3964ESX-3.3/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Output Voltage	3.3V	3.3V	3.3V	3.3V
Output Current	800mA	800mA	800mA	800mA
Input Voltage (Max)	7V	7V	7V	7V
Voltage Dropout (Max)	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA
Quiescent Current (Iq)	9mA	5mA	9mA	9mA
Supply Current (Max)	15mA	15mA	15mA	15mA
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Package Type	TO-263-6 (DDPAK-5)	TO-263-6 (DDPAK-5)	TO-263-6 (DDPAK-5)	TO-263-6 (DDPAK-5)
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Control Features	Enable	Enable	Enable	Enable
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

The LP3964ESX-3.3 is obsolete and no longer in active production. For new designs and ongoing production requirements, selection from the active substitute parts is necessary.

LP3871ESX-3.3/NOPB offers the lowest quiescent current at 5mA compared to 9mA in the original part, providing improved power efficiency in standby conditions. This part is ROHS3 compliant and available in Tape & Reel packaging.

LP3961ESX-3.3/NOPB and LP3964ESX-3.3/NOPB maintain identical quiescent current specifications to the original part at 9mA. Both are ROHS3 compliant and supplied in Tape & Reel packaging. LP3964ESX-3.3/NOPB represents the direct active equivalent with matching base product number designation.

All three substitute parts meet REACH compliance requirements and carry identical electrical performance specifications for output voltage, current capacity, dropout voltage, and operating temperature range. Selection between these options depends on power consumption priorities and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can LP3871ESX-3.3/NOPB be used as a direct replacement for LP3964ESX-3.3?

A: Yes. Both parts deliver 3.3V at 800mA output with identical voltage dropout, input voltage limits, and operating temperature range. The primary difference is quiescent current: LP3871ESX-3.3/NOPB operates at 5mA versus 9mA for the original part. This lower quiescent current makes LP3871ESX-3.3/NOPB suitable for applications where standby power consumption is a design consideration.

Q: What is the difference between LP3964ESX-3.3 and LP3964ESX-3.3/NOPB?

A: Both parts share identical electrical specifications and package configuration. The primary differences are product status (obsolete versus active) and RoHS compliance (non-compliant versus ROHS3 compliant). LP3964ESX-3.3/NOPB is the active production equivalent and is supplied in Tape & Reel packaging suitable for automated assembly.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts use the TO-263-6 (DDPAK-5) package configuration, ensuring mechanical and thermal compatibility. The main difference is packaging format: the original LP3964ESX-3.3 is supplied in bulk, while all active substitutes are supplied in Tape & Reel (TR) format for production environments.

Q: Do the substitute parts meet current regulatory requirements?

A: All three substitute parts are ROHS3 compliant and REACH unaffected, meeting current regulatory standards. The original LP3964ESX-3.3 is RoHS non-compliant, making the active substitutes necessary for applications subject to RoHS requirements.

Q: Which substitute part should be selected for lowest power consumption?

A: LP3871ESX-3.3/NOPB provides the lowest quiescent current at 5mA, compared to 9mA for LP3961ESX-3.3/NOPB and LP3964ESX-3.3/NOPB. This 4mA reduction in quiescent current results in lower standby power consumption and is beneficial for battery-powered or always-on applications.

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