LP3965ES-1.8/NOPB Equivalent & Substitute Parts

Part Overview

The LP3965ES-1.8/NOPB is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.8V output applications. This Surface Mount device in TO-263 (DDPAK-5) package delivers 1.5A output current with integrated protection features including over-current, over-temperature, and short-circuit protection. The part is currently Active in product status with 864 units in stock.

Substitute parts are identified when design requirements change, inventory constraints occur, or when enhanced performance characteristics become necessary for specific applications while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	LP3965ES-1.8/NOPB
Output Voltage (Fixed)	1.8V
Output Current	1.5A
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.55V @ 1.5A
Quiescent Current	9 mA
Operating Temperature	-40°C ~ 125°C
Package	TO-263-6 (DDPAK-5)
Protection Features	Over Current, Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LP3965ES-1.8/NOPB are categorized based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Fixed output voltage of 1.8V
Output current capability of 1.5A or greater
TO-263 (DDPAK-5) package configuration
Operating temperature range of -40°C to 125°C
Positive output configuration with Enable control feature
Protection against over-current, over-temperature, and short-circuit conditions

Substitution Categories:

Direct Parametric Equivalents maintain identical electrical specifications (1.5A output, 1.8V fixed, 7V max input) with variations in quiescent current, dropout voltage, or PSRR performance.

Enhanced Performance Substitutes provide higher output current capability (3A) while maintaining 1.8V fixed output and TO-263 package compatibility, suitable for applications requiring increased current headroom.

Cross-Manufacturer Alternatives from Microchip Technology offer equivalent 1.5A or 3A output capability at 1.8V with higher maximum input voltage ratings (16V) and identical package configuration.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Quiescent Current	PSRR	Product Status	RoHS Status
LP3965ES-1.8/NOPB	Texas Instruments	1.5A	7V	0.55V @ 1.5A	9 mA	—	Active	ROHS3 Compliant
LP3852ES-1.8/NOPB	Texas Instruments	1.5A	7V	0.38V @ 1.5A	3 mA	73dB ~ 57dB (120Hz)	Active	ROHS3 Compliant
LP3855ES-1.8/NOPB	Texas Instruments	1.5A	7V	0.38V @ 1.5A	3 mA	73dB ~ 57dB (120Hz)	Active	ROHS3 Compliant
LP3872ES-1.8/NOPB	Texas Instruments	1.5A	7V	0.55V @ 1.5A	5 mA	73dB ~ 57dB (120Hz)	Active	ROHS3 Compliant
LP3962ES-1.8/NOPB	Texas Instruments	1.5A	7V	0.55V @ 1.5A	9 mA	—	Active	ROHS3 Compliant
LP3872ES-1.8	Texas Instruments	1.5A	7V	0.55V @ 1.5A	5 mA	73dB ~ 57dB (120Hz)	Not For New Designs	RoHS non-compliant
TPS75718KTTR	Texas Instruments	3A	5.5V	—	200 µA	62dB (100Hz)	Active	ROHS3 Compliant
MIC39151-1.8WU	Microchip Technology	1.5A	16V	0.5V @ 1.5A	—	—	Active	ROHS3 Compliant
MIC39301-1.8WU	Microchip Technology	3A	16V	0.55V @ 3A	—	—	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (1.5A Output, 1.8V Fixed):

LP3852ES-1.8/NOPB and LP3855ES-1.8/NOPB are preferred direct substitutes. Both are Active products with ROHS3 compliance. These parts offer improved dropout voltage (0.38V vs. 0.55V) and lower quiescent current (3 mA vs. 9 mA), resulting in reduced power dissipation and improved efficiency in battery-powered applications.

LP3872ES-1.8/NOPB is an Active, ROHS3-compliant alternative with identical dropout voltage to the LP3965ES-1.8/NOPB but lower quiescent current (5 mA), providing a middle-ground option for efficiency optimization.

LP3962ES-1.8/NOPB matches the LP3965ES-1.8/NOPB electrical specifications exactly and is Active with ROHS3 compliance, suitable for direct pin-compatible replacement.

LP3872ES-1.8 (without /NOPB suffix) is marked "Not For New Designs" and is RoHS non-compliant. This part should not be selected for new applications.

For Enhanced Current Capability (3A Output, 1.8V Fixed):

TPS75718KTTR from Texas Instruments provides 3A output current in the same TO-263 package. This part is Active and ROHS3 compliant. The reduced maximum input voltage (5.5V vs. 7V) must be verified against system requirements. This part includes Power Good output and UVLO protection in addition to standard protection features.

MIC39301-1.8WU from Microchip Technology delivers 3A output current with higher maximum input voltage rating (16V). This part is Active and ROHS3 compliant, offering greater input voltage flexibility for applications with variable supply sources.

For Extended Input Voltage Range:

MIC39151-1.8WU (1.5A) and MIC39301-1.8WU (3A) from Microchip Technology support maximum input voltage of 16V, compared to 7V for Texas Instruments LP series parts. These cross-manufacturer alternatives are suitable for applications requiring higher input voltage tolerance while maintaining 1.8V fixed output and TO-263 package compatibility.

Frequently Asked Questions (FAQ)

Q: Can LP3852ES-1.8/NOPB or LP3855ES-1.8/NOPB be used as direct replacements for LP3965ES-1.8/NOPB?

A: Yes. Both parts maintain identical output voltage (1.8V), output current (1.5A), input voltage rating (7V max), operating temperature range (-40°C to 125°C), and TO-263 package configuration. The primary differences are improved dropout voltage (0.38V vs. 0.55V) and lower quiescent current (3 mA vs. 9 mA), which reduce power dissipation. All three are Active products with ROHS3 compliance.

Q: What is the difference between LP3872ES-1.8/NOPB and LP3872ES-1.8?

A: LP3872ES-1.8/NOPB is an Active product with ROHS3 compliance suitable for new designs. LP3872ES-1.8 (without /NOPB suffix) is marked "Not For New Designs" and is RoHS non-compliant. The /NOPB designation indicates lead-free (no lead/no plumbum) processing. New designs must use LP3872ES-1.8/NOPB.

Q: When should TPS75718KTTR be selected instead of direct 1.5A equivalents?

A: TPS75718KTTR provides 3A output current in the same TO-263 package, suitable for applications requiring higher current capacity. However, the maximum input voltage is reduced to 5.5V compared to 7V for the LP3965ES-1.8/NOPB. Verify that your input supply does not exceed 5.5V before selecting this part. TPS75718KTTR also includes Power Good output and UVLO protection features.

Q: What are the advantages of Microchip MIC39151-1.8WU or MIC39301-1.8WU over Texas Instruments equivalents?

A: Microchip parts support maximum input voltage of 16V, providing greater flexibility for applications with variable or higher input supply voltages. MIC39151-1.8WU maintains 1.5A output current, while MIC39301-1.8WU provides 3A output current. Both are Active products with ROHS3 compliance and identical TO-263 package configuration. Reverse polarity protection is included in both Microchip devices.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts listed are available in TO-263-6 (DDPAK-5) package configuration, ensuring mechanical and thermal compatibility. Packaging format variations (Tube vs. Tape & Reel) do not affect electrical performance or PCB mounting compatibility. Verify packaging availability with your supplier based on procurement requirements.

Q: Can LP3965ES-1.8/NOPB be replaced with a part rated for higher output current without circuit modification?

A: Yes, parts rated for higher output current (3A) such as TPS75718KTTR or MIC39301-1.8WU can be used as direct replacements in the same TO-263 package without circuit modification. The higher current rating provides additional design margin and does not negatively impact applications requiring only 1.5A. Verify input voltage compatibility: TPS75718KTTR maximum is 5.5V, while MIC39301-1.8WU supports 16V maximum input.

Q: What protection features are common across all substitute parts?

A: All substitute parts include over-current and over-temperature protection. Short-circuit protection is standard across Texas Instruments LP series parts. Microchip MIC39151-1.8WU and MIC39301-1.8WU add reverse polarity protection. TPS75718KTTR includes UVLO (Under Voltage Lockout) protection in addition to standard features.

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