LP3965ET-3.3 Equivalent & Substitute Parts

Part Overview

The LP3965ET-3.3 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 3.3V output at 1.5A in a TO-220-5 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part provides positive fixed output configuration with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for applications requiring stable 3.3V regulation from input sources up to 7V.

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-220-5 Formed Leads
Mounting Type	Through Hole
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution eligibility for the LP3965ET-3.3 is determined by the following critical parameters:

Output voltage: 3.3V fixed
Output current capability: 1.5A
Input voltage maximum: 7V
Package: TO-220-5 Formed Leads
Mounting: Through Hole
Operating temperature range: -40°C ~ 125°C
Protection features: Over Current, Over Temperature, Short Circuit
Control features: Enable function

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalent: LP3965ET-3.3/NOPB maintains identical electrical specifications and differs only in packaging format (Tube vs. unspecified) and product status (Active vs. Obsolete). This part is RoHS3 compliant.

Parametric Equivalents: LP3852ET-3.3/NOPB, LP3855ET-3.3/NOPB, LP3875ET-3.3/NOPB, LP3962ET-3.3/NOPB, and LP3962ET-3.3/LB05 meet all critical electrical and mechanical requirements. These parts share identical output voltage, current rating, input voltage maximum, package type, mounting method, operating temperature range, and protection features. Variations exist in quiescent current, voltage dropout characteristics, and PSRR specifications, which remain within acceptable tolerance for functional equivalence.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Voltage Dropout @ 1.5A	Quiescent Current (Iq)	Package	Product Status	RoHS Status
LP3965ET-3.3	Texas Instruments	3.3V	1.5A	7V	0.55V	9 mA	TO-220-5	Obsolete	Non-compliant
LP3965ET-3.3/NOPB	Texas Instruments	3.3V	1.5A	7V	0.55V	9 mA	TO-220-5	Active	ROHS3 Compliant
LP3852ET-3.3/NOPB	National Semiconductor	3.3V	1.5A	7V	0.38V	3 mA	TO-220-5	Active	ROHS3 Compliant
LP3855ET-3.3/NOPB	Texas Instruments	3.3V	1.5A	7V	0.38V	3 mA	TO-220-5	Active	ROHS3 Compliant
LP3875ET-3.3/NOPB	Texas Instruments	3.3V	1.5A	7V	0.55V	5 mA	TO-220-5	Active	ROHS3 Compliant
LP3962ET-3.3/NOPB	Texas Instruments	3.3V	1.5A	7V	0.55V	9 mA	TO-220-5	Active	ROHS3 Compliant
LP3962ET-3.3/LB05	Texas Instruments	3.3V	1.5A	7V	0.55V	9 mA	TO-220-5	Last Time Buy	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: LP3965ET-3.3/NOPB is the direct equivalent with active product status and RoHS3 compliance. This part provides identical electrical performance to the obsolete LP3965ET-3.3 while offering current availability and regulatory compliance.

Secondary Recommendations for Active Designs:

LP3855ET-3.3/NOPB and LP3852ET-3.3/NOPB offer improved performance characteristics with lower quiescent current (3 mA vs. 9 mA) and reduced voltage dropout (0.38V vs. 0.55V), resulting in lower power dissipation. Both maintain active product status and RoHS3 compliance.

LP3875ET-3.3/NOPB provides a middle-ground option with moderate quiescent current reduction (5 mA) while maintaining the original 0.55V dropout specification. Active status and RoHS3 compliance are confirmed.

LP3962ET-3.3/NOPB matches the electrical specifications of the original part with active product status and RoHS3 compliance.

Avoid for New Designs: LP3962ET-3.3/LB05 carries Last Time Buy status, indicating discontinued production. This part is suitable only for legacy system maintenance where existing inventory exists.

All recommended substitutes maintain identical package type (TO-220-5), mounting method (Through Hole), operating temperature range (-40°C ~ 125°C), and protection features, ensuring direct PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can LP3965ET-3.3/NOPB replace LP3965ET-3.3 directly?

A: Yes. LP3965ET-3.3/NOPB is the direct equivalent with identical electrical specifications. The primary differences are packaging format (Tube) and product status (Active vs. Obsolete). No circuit modifications are required.

Q: What are the advantages of LP3855ET-3.3/NOPB over the original LP3965ET-3.3?

A: LP3855ET-3.3/NOPB reduces quiescent current from 9 mA to 3 mA and lowers voltage dropout from 0.55V to 0.38V at 1.5A output. These improvements decrease power dissipation and heat generation, beneficial for battery-powered or thermally constrained applications.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended substitutes except LP3962ET-3.3/LB05 are RoHS3 compliant. LP3962ET-3.3/LB05 is also RoHS3 compliant but carries Last Time Buy status. The original LP3965ET-3.3 is RoHS non-compliant.

Q: Can I use LP3852ET-3.3/NOPB from National Semiconductor as a substitute?

A: Yes. LP3852ET-3.3/NOPB meets all critical electrical and mechanical parameters. It is manufactured by National Semiconductor (now part of Texas Instruments) and offers improved performance with lower quiescent current and dropout voltage.

Q: Does package type differ between substitutes?

A: All substitute parts use TO-220-5 Formed Leads with Through Hole mounting, identical to the original LP3965ET-3.3. PCB footprints and mounting methods are compatible without modification.

Q: What is the difference between LP3962ET-3.3/NOPB and LP3962ET-3.3/LB05?

A: Both parts have identical electrical specifications. The primary difference is product status: LP3962ET-3.3/NOPB is Active, while LP3962ET-3.3/LB05 is Last Time Buy. For new designs, select LP3962ET-3.3/NOPB.

Q: Which substitute offers the best thermal performance?

A: LP3855ET-3.3/NOPB and LP3852ET-3.3/NOPB provide the lowest quiescent current (3 mA) and voltage dropout (0.38V), resulting in minimal heat generation. These are optimal for thermally sensitive applications.

Q: Are all parts rated for -40°C ~ 125°C operation?

A: Yes. All substitute parts maintain the original operating temperature range of -40°C ~ 125°C, ensuring compatibility across industrial and extended temperature applications.

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