LP3876ET-3.3 Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The LP3876ET-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output applications with 3A current capacity in a TO-220-5 package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The device provides regulated 3.3V output with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for applications requiring stable low-voltage power distribution.

Substiute Parts

LP3876ET-3.3

Texas InstrumentsIn Stock: 1814LP3876ET-3.3 Datasheet

Current PartRFQ

LP3853ET-3.3/NOPB

Texas InstrumentsIn Stock: 1164LP3853ET-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP3856ET-3.3/NOPB

Texas InstrumentsIn Stock: 1151LP3856ET-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP3876ET-3.3/NOPB

National SemiconductorIn Stock: 2190LP3876ET-3.3/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LP3876ET-3.3 is determined by the following critical parameters that must remain constant across equivalent parts:

• Output voltage: 3.3V fixed
• Output current capacity: 3A minimum
• Package type: TO-220-5 Formed Leads
• Input voltage maximum: 7V
• Operating temperature range: -40°C ~ 125°C
• Protection features: Over Current, Over Temperature, Short Circuit
• Control features: Enable function

Parts meeting these criteria are classified as parametric equivalents or direct manufacturer equivalents. Variations in voltage dropout, quiescent current, and compliance certifications do not prevent substitution but may affect performance characteristics in specific applications.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts meet the core electrical and mechanical requirements for direct replacement of the LP3876ET-3.3. Selection should be based on the following factors:

LP3853ET-3.3/NOPB and LP3856ET-3.3/NOPB are active products with ROHS3 compliance certification, offering improved regulatory status compared to the obsolete LP3876ET-3.3. These parts feature reduced voltage dropout (0.6V @ 3A versus 1.2V @ 3A) and lower quiescent current (4 mA versus 5 mA), resulting in improved thermal efficiency and reduced power dissipation in applications operating at maximum current.

LP3876ET-3.3/NOPB from National Semiconductor maintains identical electrical specifications to the original part, including voltage dropout and quiescent current characteristics. This part is currently in active production status with higher inventory availability (2100 pcs).

For new designs or applications where regulatory compliance is required, LP3853ET-3.3/NOPB or LP3856ET-3.3/NOPB are preferred due to ROHS3 certification. For applications requiring exact electrical performance matching or where existing designs have been validated against the original specifications, LP3876ET-3.3/NOPB provides direct equivalence.

Frequently Asked Questions (FAQ)

Q: Can LP3853ET-3.3/NOPB or LP3856ET-3.3/NOPB be used as direct replacements for LP3876ET-3.3?

A: Yes. Both parts are parametric equivalents meeting all critical electrical and mechanical specifications: 3.3V fixed output, 3A current capacity, TO-220-5 package, 7V maximum input voltage, and identical operating temperature range. The reduced voltage dropout and quiescent current represent performance improvements rather than incompatibilities.

Q: What is the difference between LP3853ET-3.3/NOPB and LP3856ET-3.3/NOPB?

A: Both parts share identical electrical specifications and performance characteristics. The difference lies in base product numbers (LP3853 versus LP3856) and internal design variants. For substitution purposes, they are functionally equivalent.

Q: Why does LP3876ET-3.3/NOPB from National Semiconductor have different specifications than the Texas Instruments version?

A: Both versions maintain the same output voltage (3.3V), output current (3A), package type (TO-220-5), and protection features. The National Semiconductor version preserves the original voltage dropout (1.2V @ 3A) and quiescent current (5 mA) specifications, making it a direct electrical equivalent to the original part.

Q: Are there compliance differences between these substitute parts?

A: Yes. LP3853ET-3.3/NOPB and LP3856ET-3.3/NOPB are ROHS3 compliant, while the original LP3876ET-3.3 is RoHS non-compliant. The National Semiconductor LP3876ET-3.3/NOPB compliance status is not specified in available documentation. For applications requiring RoHS compliance, select LP3853ET-3.3/NOPB or LP3856ET-3.3/NOPB.

Q: Will the improved voltage dropout of LP3853ET-3.3/NOPB or LP3856ET-3.3/NOPB affect my circuit design?

A: The reduced voltage dropout (0.6V @ 3A versus 1.2V @ 3A) represents an improvement that reduces power dissipation and heat generation. Existing circuit designs validated for the original 1.2V dropout specification will operate with enhanced thermal performance using these parts. No circuit redesign is required.

Q: What packaging options are available for these substitute parts?

A: LP3876ET-3.3 is supplied in bulk packaging. LP3853ET-3.3/NOPB and LP3856ET-3.3/NOPB are supplied in tube packaging. LP3876ET-3.3/NOPB from National Semiconductor is supplied in bulk packaging. All parts use identical TO-220-5 Formed Leads package type suitable for through-hole mounting.