LP3965ESX-3.3 Equivalent & Substitute Parts

Part Overview

The LP3965ESX-3.3 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed 3.3V output at 1.5A in a TO-263 (DDPAK-5) surface mount package. The device is currently in Last Time Buy status, indicating end-of-life production. Identifying parametric equivalents and substitute parts is necessary to ensure design continuity and maintain supply chain flexibility for applications requiring this voltage regulation topology.

Key Parameters

Parameter	Value
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
Package Type	TO-263 (DDPAK-5)
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitute parts for the LP3965ESX-3.3 are selected based on strict parametric equivalence within the following criteria:

Fixed output voltage of 3.3V
Output current capability of 1.5A
Maximum input voltage of 7V
TO-263 (DDPAK-5) package compatibility
Operating temperature range of -40°C to 125°C
Identical protection features (Over Current, Over Temperature, Short Circuit)
Enable control feature availability

Five substitute parts meet these core requirements. Differences exist in quiescent current consumption, voltage dropout characteristics, and product status (Active vs. Last Time Buy). These variations allow selection based on specific application power efficiency needs and supply availability.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Dropout @ 1.5A	Quiescent Current (Iq)	Supply Current (Max)	PSRR	Packaging	Inventory
LP3965ESX-3.3	Texas Instruments	Last Time Buy	0.55V	9 mA	15 mA	—	Tape & Reel (TR)	1659 Pcs
LP3852ESX-3.3/NOPB	Texas Instruments	Active	0.38V	3 mA	10 mA	73dB ~ 57dB (120Hz)	Tape & Reel (TR)	2351 Pcs
LP3855ESX-3.3/NOPB	National Semiconductor	Active	0.38V	3 mA	10 mA	73dB ~ 57dB (120Hz)	Bulk	1700 Pcs
LP3872ESX-3.3/NOPB	Texas Instruments	Active	0.55V	5 mA	15 mA	73dB ~ 57dB (120Hz)	Tape & Reel (TR)	1529 Pcs
LP3875ESX-3.3/NOPB	National Semiconductor	Active	0.55V	5 mA	15 mA	73dB ~ 57dB (120Hz)	Bulk	1412 Pcs
LP3962ESX-3.3/NOPB	Texas Instruments	Active	0.55V	9 mA	15 mA	—	Cut Tape (CT) & Digi-Reel®	2300 Pcs
LP3965ESX-3.3/NOPB	National Semiconductor	Active	0.55V	9 mA	15 mA	—	Bulk	2783 Pcs

Engineering Selection Recommendations

Selection among substitute parts should be based on the following criteria:

For Active Product Status Priority: LP3852ESX-3.3/NOPB, LP3855ESX-3.3/NOPB, LP3872ESX-3.3/NOPB, LP3875ESX-3.3/NOPB, LP3962ESX-3.3/NOPB, and LP3965ESX-3.3/NOPB are all in Active status, ensuring long-term availability and supply continuity compared to the Last Time Buy status of the original LP3965ESX-3.3.

For Power Efficiency: LP3852ESX-3.3/NOPB and LP3855ESX-3.3/NOPB offer reduced quiescent current (3 mA) and lower voltage dropout (0.38V @ 1.5A), resulting in improved power efficiency for battery-powered or low-power applications.

For Dropout Voltage Matching: LP3872ESX-3.3/NOPB, LP3875ESX-3.3/NOPB, LP3962ESX-3.3/NOPB, and LP3965ESX-3.3/NOPB maintain the 0.55V dropout specification, suitable for applications with tighter input voltage margins.

For Quiescent Current Matching: LP3962ESX-3.3/NOPB and LP3965ESX-3.3/NOPB maintain the 9 mA quiescent current specification, matching the original part's standby power consumption profile.

For Packaging Availability: Texas Instruments parts (LP3852ESX-3.3/NOPB, LP3872ESX-3.3/NOPB, LP3962ESX-3.3/NOPB) are available in Tape & Reel or Cut Tape packaging. National Semiconductor parts (LP3855ESX-3.3/NOPB, LP3875ESX-3.3/NOPB, LP3965ESX-3.3/NOPB) are available in Bulk packaging.

For Compliance: All substitute parts maintain ROHS3 compliance, REACH Unaffected status, and identical EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can LP3852ESX-3.3/NOPB directly replace LP3965ESX-3.3 in my design?

A: Yes, LP3852ESX-3.3/NOPB is a parametric equivalent with identical output voltage (3.3V), output current (1.5A), input voltage rating (7V max), package type (TO-263 DDPAK-5), and operating temperature range (-40°C to 125°C). It offers improved performance with lower dropout voltage (0.38V vs. 0.55V) and reduced quiescent current (3 mA vs. 9 mA). Pin-to-pin compatibility and functional equivalence are confirmed.

Q: What is the difference between LP3852ESX-3.3/NOPB and LP3872ESX-3.3/NOPB?

A: Both are Texas Instruments Active products in TO-263 packaging. LP3852ESX-3.3/NOPB has lower dropout voltage (0.38V) and quiescent current (3 mA), making it more efficient. LP3872ESX-3.3/NOPB maintains higher dropout voltage (0.55V) and quiescent current (5 mA), matching the original LP3965ESX-3.3 dropout specification more closely. Selection depends on whether your application prioritizes power efficiency or dropout voltage matching.

Q: Are National Semiconductor parts (LP3855ESX-3.3/NOPB, LP3875ESX-3.3/NOPB, LP3965ESX-3.3/NOPB) equivalent to Texas Instruments parts?

A: Yes, all substitute parts meet the same parametric requirements for output voltage, current, package, and operating temperature. National Semiconductor and Texas Instruments parts differ in packaging format (Bulk vs. Tape & Reel) and specific performance characteristics (dropout voltage and quiescent current). Functional and electrical equivalence is confirmed for all listed substitutes.

Q: Why does LP3965ESX-3.3/NOPB from National Semiconductor differ from the original LP3965ESX-3.3 from Texas Instruments?

A: Both parts share the same base model number (LP3965) and identical electrical specifications (0.55V dropout, 9 mA quiescent current). The primary difference is manufacturer (National Semiconductor vs. Texas Instruments) and packaging format (Bulk vs. Tape & Reel). Both are Active products with equivalent performance and compatibility.

Q: What packaging options are available for substitutes?

A: Texas Instruments substitutes are available in Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel® packaging, suitable for automated assembly. National Semiconductor substitutes are available in Bulk packaging. All parts use the same TO-263 (DDPAK-5) component package format, ensuring PCB footprint compatibility.

Q: Are all substitute parts RoHS3 compliant?

A: Texas Instruments parts (LP3852ESX-3.3/NOPB, LP3872ESX-3.3/NOPB, LP3962ESX-3.3/NOPB) are explicitly marked as ROHS3 Compliant. National Semiconductor parts do not list RoHS status in the provided specifications. Verify RoHS compliance requirements with your supplier for National Semiconductor parts if regulatory compliance is mandatory for your application.

Q: Which substitute offers the best power efficiency?

A: LP3852ESX-3.3/NOPB and LP3855ESX-3.3/NOPB offer the lowest quiescent current (3 mA) and lowest dropout voltage (0.38V @ 1.5A), resulting in the lowest total power dissipation. These parts are optimal for battery-powered or low-power standby applications where efficiency is critical.

Q: Can I use these parts interchangeably in production?

A: All listed substitute parts are pin-to-pin compatible in the TO-263 (DDPAK-5) package and meet the core electrical requirements. However, verify specific performance characteristics (dropout voltage, quiescent current, PSRR) against your circuit design requirements before implementing production-level substitution. Packaging format differences (Tape & Reel vs. Bulk) may affect assembly process compatibility.

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