LP3965ES-3.3 Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The LP3965ES-3.3 is a linear voltage regulator IC manufactured by Texas Instruments, designed to deliver a fixed 3.3V output at 1.5A in a surface-mount TO-263 (DDPAK-5) package. This device is classified as Last Time Buy, indicating limited availability from the original manufacturer. The part integrates over-current, over-temperature, and short-circuit protection with an enable control feature, making it suitable for power management applications requiring regulated 3.3V rails.

Identifying equivalent and substitute parts is necessary due to the Last Time Buy status, which restricts future procurement of the original LP3965ES-3.3. Alternative parts with matching or superior electrical characteristics and identical mechanical packaging ensure design continuity and supply chain reliability.

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
Supply Current (Max)	15 mA
Operating Temperature Range	-40°C to 125°C
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the LP3965ES-3.3 is determined by strict adherence to the following criteria:

Mandatory Matching Parameters:

Output voltage: 3.3V fixed
Output current capability: 1.5A minimum
Input voltage rating: 7V maximum
Package type: TO-263 (DDPAK-5) surface mount
Operating temperature range: -40°C to 125°C minimum
Protection features: Over-current, over-temperature, short-circuit protection
Control feature: Enable function

Allowable Variations:

Voltage dropout may be equal or lower (0.38V is acceptable; 0.55V is acceptable)
Quiescent current may vary (3 mA, 5 mA, or 9 mA are all acceptable)
Supply current may vary (10 mA or 15 mA are acceptable)
PSRR specification may be present or absent
Product status may differ (Active or Last Time Buy)
REACH compliance status may differ

All substitute parts listed below meet these criteria and are manufactured by Texas Instruments in identical or compatible packaging.

Parameter Comparison

Part Number	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage @ 1.5A	Iq (mA)	Supply Current (Max)	Product Status	Inventory
LP3965ES-3.3	3.3V	1.5A	7V	0.55V	9	15 mA	Last Time Buy	1120 Pcs
LP3965ES-3.3/NOPB	3.3V	1.5A	7V	0.55V	9	15 mA	Active	1138 Pcs
LP3852ES-3.3/NOPB	3.3V	1.5A	7V	0.38V	3	10 mA	Active	2000 Pcs
LP3855ES-3.3/NOPB	3.3V	1.5A	7V	0.38V	3	10 mA	Active	1570 Pcs
LP3872ES-3.3/NOPB	3.3V	1.5A	7V	0.55V	5	15 mA	Active	1831 Pcs
LP3875ES-3.3/NOPB	3.3V	1.5A	7V	0.55V	5	15 mA	Active	3270 Pcs
LP3852ES-3.3	3.3V	1.5A	7V	0.38V	3	10 mA	Last Time Buy	1440 Pcs
LP3962ES-3.3/NOPB	3.3V	1.5A	7V	0.55V	9	15 mA	Active	1105 Pcs

Engineering Selection Recommendations

Direct Replacement (Identical Electrical Characteristics): LP3965ES-3.3/NOPB is the direct equivalent with Active product status, providing the same electrical performance as the original LP3965ES-3.3. This part is recommended as the primary substitute due to identical specifications and improved availability.

Enhanced Performance Alternatives (Lower Dropout Voltage, Lower Quiescent Current): LP3852ES-3.3/NOPB and LP3855ES-3.3/NOPB offer superior efficiency characteristics with 0.38V dropout voltage and 3 mA quiescent current, compared to the original 0.55V dropout and 9 mA quiescent current. Both parts are Active status with higher inventory levels. These parts are suitable for applications where reduced power dissipation and improved thermal performance are beneficial.

Intermediate Performance Options (Lower Quiescent Current, Maintained Dropout): LP3872ES-3.3/NOPB and LP3875ES-3.3/NOPB maintain the 0.55V dropout voltage while reducing quiescent current to 5 mA. Both are Active status with strong inventory availability. LP3875ES-3.3/NOPB offers the highest inventory level (3270 Pcs) among all substitutes.

Last Time Buy Consideration: LP3852ES-3.3 (without /NOPB suffix) shares Last Time Buy status with the original part. While electrically superior, this part faces the same supply constraints as the original and should not be selected as a long-term solution.

All substitute parts maintain ROHS3 compliance, identical MSL rating, and equivalent mechanical packaging. Selection should prioritize Active status parts for supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can LP3965ES-3.3/NOPB be used as a direct drop-in replacement for LP3965ES-3.3? A: Yes. LP3965ES-3.3/NOPB is electrically and mechanically identical to LP3965ES-3.3, with the only difference being Active product status versus Last Time Buy. The /NOPB suffix indicates lead-free plating and does not affect electrical performance. Both parts use the same TO-263 (DDPAK-5) package and are pin-compatible.

Q: What is the difference between LP3852ES-3.3/NOPB and LP3852ES-3.3? A: Both parts are electrically identical with 0.38V dropout voltage and 3 mA quiescent current. The primary difference is product status: LP3852ES-3.3/NOPB is Active with 2000 Pcs inventory, while LP3852ES-3.3 is Last Time Buy with 1440 Pcs inventory. For new designs, LP3852ES-3.3/NOPB is preferred due to sustained availability.

Q: Are LP3852ES-3.3/NOPB and LP3855ES-3.3/NOPB interchangeable? A: Yes. Both parts have identical electrical specifications: 3.3V output, 1.5A current, 0.38V dropout voltage, 3 mA quiescent current, and -40°C to 125°C operating range. Both use TO-263 (DDPAK-5) packaging. Selection between them can be based on inventory availability or supplier preference.

Q: What are the benefits of using LP3875ES-3.3/NOPB over the original LP3965ES-3.3? A: LP3875ES-3.3/NOPB offers improved quiescent current (5 mA versus 9 mA), reducing standby power consumption. It maintains the same 0.55V dropout voltage and 1.5A output current. The part is Active status with the highest inventory level (3270 Pcs) among all substitutes, ensuring long-term supply availability.

Q: Can these parts be used in existing PCB designs without layout modifications? A: Yes. All substitute parts use the identical TO-263 (DDPAK-5) package with the same pin configuration, thermal tab, and footprint. No PCB layout changes are required for mechanical compatibility. Electrical performance differences (dropout voltage, quiescent current) do not affect pin functionality or signal integrity.

Q: Which substitute part should be selected for new designs? A: For new designs requiring long-term supply assurance, LP3875ES-3.3/NOPB is recommended due to Active status, highest inventory availability (3270 Pcs), and improved quiescent current (5 mA). If lower dropout voltage is critical for thermal performance, LP3852ES-3.3/NOPB or LP3855ES-3.3/NOPB are preferred alternatives with 0.38V dropout and 3 mA quiescent current.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts are ROHS3 compliant with MSL rating of 3 (168 Hours), matching the original LP3965ES-3.3 specifications.

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