LP3875ET-3.3 Equivalent & Substitute Parts

Part Overview

The LP3875ET-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-220-5 package configuration. The device features integrated protection against overcurrent, overtemperature, and short circuit conditions, with an enable control feature for power management applications.

The LP3875ET-3.3 is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance of systems utilizing this regulator.

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)	5 mA
Supply Current (Max)	15 mA
PSRR	73dB ~ 57dB (120Hz)
Operating Temperature Range	-40°C ~ 125°C
Package / Case	TO-220-5 Formed Leads
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitute parts for the LP3875ET-3.3 are classified based on electrical and mechanical parameter compatibility within the allowed specifications for this product category.

Direct Manufacturer Equivalent: Parts sharing identical electrical specifications, output configuration, and package type with only packaging format differences qualify as direct equivalents. These parts maintain full pin-for-pin and functional compatibility.

Parametric Equivalents: Parts meeting the core electrical requirements—fixed 3.3V output, 1.5A current capability, TO-220-5 package, and identical protection features—are classified as parametric equivalents. Variations in quiescent current, dropout voltage, or PSRR performance remain within acceptable substitution parameters when the primary functional requirements are met.

Key Parameters Determining Substitution:

Output voltage: 3.3V (fixed)
Output current: 1.5A minimum
Input voltage maximum: 7V
Package type: TO-220-5 Formed Leads
Output configuration: Positive
Protection features: Over Current, Over Temperature, Short Circuit
Control features: Enable function

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Voltage	Output Current	Dropout (Max)	Iq (mA)	Supply Current (Max)	Package	RoHS Status
LP3875ET-3.3	Texas Instruments	Obsolete	3.3V	1.5A	0.55V @ 1.5A	5	15 mA	TO-220-5	RoHS non-compliant
LP3875ET-3.3/NOPB	Texas Instruments	Active	3.3V	1.5A	0.55V @ 1.5A	5	15 mA	TO-220-5	ROHS3 Compliant
LP3852ET-3.3/NOPB	National Semiconductor	Active	3.3V	1.5A	0.38V @ 1.5A	3	10 mA	TO-220-5	ROHS3 Compliant
LP3855ET-3.3/NOPB	Texas Instruments	Active	3.3V	1.5A	0.38V @ 1.5A	3	10 mA	TO-220-5	ROHS3 Compliant
LP3962ET-3.3/NOPB	Texas Instruments	Active	3.3V	1.5A	0.55V @ 1.5A	9	15 mA	TO-220-5	ROHS3 Compliant
LP3962ET-3.3/LB05	Texas Instruments	Last Time Buy	3.3V	1.5A	0.55V @ 1.5A	9	15 mA	TO-220-5	ROHS3 Compliant
LP3965ET-3.3/NOPB	Texas Instruments	Active	3.3V	1.5A	0.55V @ 1.5A	9	15 mA	TO-220-5	ROHS3 Compliant

Engineering Selection Recommendations

Preferred Primary Substitute: LP3875ET-3.3/NOPB

The LP3875ET-3.3/NOPB is the direct equivalent of the obsolete LP3875ET-3.3, maintaining identical electrical specifications and pin configuration. This part is currently in active production status with ROHS3 compliance certification, making it the optimal choice for direct replacement in existing designs.

Secondary Substitutes with Enhanced Performance: LP3852ET-3.3/NOPB and LP3855ET-3.3/NOPB

Both LP3852ET-3.3/NOPB and LP3855ET-3.3/NOPB offer improved performance characteristics compared to the original part. These devices feature reduced dropout voltage (0.38V versus 0.55V) and lower quiescent current (3 mA versus 5 mA), resulting in decreased power dissipation and improved efficiency. Both maintain active production status and ROHS3 compliance. The LP3855ET-3.3/NOPB is manufactured by Texas Instruments, while the LP3852ET-3.3/NOPB is from National Semiconductor.

Alternative Substitutes: LP3962ET-3.3/NOPB and LP3965ET-3.3/NOPB

The LP3962ET-3.3/NOPB and LP3965ET-3.3/NOPB are parametric equivalents with active production status and ROHS3 compliance. These parts maintain the original dropout voltage specification (0.55V @ 1.5A) but feature higher quiescent current (9 mA). Selection of these alternatives is appropriate when design requirements specifically necessitate the original dropout voltage characteristic.

Avoid: LP3962ET-3.3/LB05

The LP3962ET-3.3/LB05 carries a Last Time Buy product status designation, indicating limited future availability. This part should be avoided for new designs or long-term production requirements.

Frequently Asked Questions (FAQ)

Q: Can LP3875ET-3.3/NOPB be used as a direct replacement for LP3875ET-3.3?

A: Yes. The LP3875ET-3.3/NOPB is the direct manufacturer equivalent with identical electrical specifications, pin configuration, and functional characteristics. The primary difference is packaging format (Tube versus unspecified) and RoHS compliance status (ROHS3 Compliant versus non-compliant).

Q: What are the advantages of using LP3855ET-3.3/NOPB or LP3852ET-3.3/NOPB over the original LP3875ET-3.3?

A: Both alternatives provide improved performance through reduced dropout voltage (0.38V versus 0.55V at 1.5A output) and lower quiescent current (3 mA versus 5 mA). These improvements result in lower power dissipation and higher efficiency, particularly beneficial in battery-powered or thermally constrained applications. Both parts maintain full electrical compatibility with the original design.

Q: Are all substitute parts pin-compatible with the original LP3875ET-3.3?

A: Yes. All listed substitute parts utilize the TO-220-5 Formed Leads package configuration with identical pin assignments, enabling direct board-level replacement without circuit modification.

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

A: Both parts are electrically identical. The primary distinction is product status: LP3962ET-3.3/NOPB is in active production, while LP3962ET-3.3/LB05 is designated Last Time Buy, indicating limited future availability. For new designs or ongoing production, LP3962ET-3.3/NOPB is the appropriate selection.

Q: Which substitute part should be selected for new designs?

A: For new designs, LP3875ET-3.3/NOPB is recommended as the direct equivalent. For applications prioritizing efficiency and reduced power dissipation, LP3855ET-3.3/NOPB or LP3852ET-3.3/NOPB are preferred alternatives. All three parts are in active production with ROHS3 compliance certification.

Q: Are there any compliance or certification differences between substitute parts?

A: All substitute parts listed carry ROHS3 compliance certification. The original LP3875ET-3.3 is RoHS non-compliant. REACH status varies: LP3962ET-3.3/LB05 is REACH Affected, while all other parts are REACH Unaffected. For applications requiring specific compliance certifications, verify requirements against individual part specifications.

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