LP2954IT Linear Voltage Regulator 5V 250mA TO-220-3 Equivalent & Substitute Parts

Part Overview

The LP2954IT is a linear voltage regulator IC from Texas Instruments designed for positive fixed 5V output at 250mA in a TO-220-3 package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The LP2954IT provides essential power management functionality with integrated protection features including over-current, over-temperature, and reverse polarity protection, operating across the industrial temperature range of -40°C to 125°C.

Substiute Parts

LP2954IT

Texas InstrumentsIn Stock: 2333LP2954IT Datasheet

Current PartRFQ

LP2954IT/NOPB

National SemiconductorIn Stock: 1164LP2954IT/NOPB Datasheet

DirectRFQ

LP2954AIT/NOPB

Texas InstrumentsIn Stock: 1618LP2954AIT/NOPB Datasheet

Parametric EquivalentRFQ

MIC29150-5.0WT

Microchip TechnologyIn Stock: 5136MIC29150-5.0WT Datasheet

MFR RecommendedRFQ

MIC2920A-5.0WT

Microchip TechnologyIn Stock: 2362MIC2920A-5.0WT Datasheet

MFR RecommendedRFQ

MIC29300-5.0WT

Microchip TechnologyIn Stock: 3347MIC29300-5.0WT Datasheet

MFR RecommendedRFQ

MIC2937A-5.0WT

Microchip TechnologyIn Stock: 11644MIC2937A-5.0WT Datasheet

MFR RecommendedRFQ

MIC2940A-5.0WT

Microchip TechnologyIn Stock: 9432MIC2940A-5.0WT Datasheet

MFR RecommendedRFQ

MIC29500-5.0WT

Microchip TechnologyIn Stock: 1561MIC29500-5.0WT Datasheet

MFR RecommendedRFQ

MIC2954-02WT

Microchip TechnologyIn Stock: 1366MIC2954-02WT Datasheet

MFR RecommendedRFQ

MIC2954-03WT

Microchip TechnologyIn Stock: 1915MIC2954-03WT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP2954IT are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

• Output voltage fixed at 5V
• TO-220-3 package for direct pin-compatible replacement
• Operating temperature range -40°C to 125°C
• Through-hole mounting configuration
• Output current capability of 250mA or greater
• Maximum input voltage of 26V or higher
• Protection features including over-current and over-temperature

Parts are grouped into three categories: direct manufacturer equivalents (identical part numbers with different packaging or compliance status), parametric equivalents (identical electrical specifications), and manufacturer-recommended alternatives (higher current capability options for design flexibility).

Parameter Comparison

Engineering Selection Recommendations

For direct replacement of the obsolete LP2954IT, the LP2954AIT/NOPB from Texas Instruments is the primary choice. This part maintains identical electrical specifications and package configuration while offering active product status and ROHS3 compliance, eliminating obsolescence risk and meeting modern regulatory requirements.

The LP2954IT/NOPB from National Semiconductor provides an alternative direct equivalent with active status, though RoHS compliance status is not specified in available documentation.

For applications where higher current capacity is acceptable, the Microchip Technology MIC2954-02WT and MIC2954-03WT offer identical 250mA output current with improved voltage dropout characteristics (0.6V versus 0.8V) and full ROHS3 compliance. These parts are pin-compatible and functionally equivalent.

Higher current variants from Microchip Technology (MIC2920A-5.0WT through MIC29500-5.0WT) are suitable for designs requiring increased output current while maintaining the same 5V output voltage, TO-220-3 package, and operating temperature range. These parts feature reduced voltage dropout and enhanced protection features. Selection among these variants depends on specific application current requirements.

All recommended substitutes maintain the TO-220-3 through-hole package configuration, ensuring mechanical compatibility with existing PCB layouts and thermal management solutions.

Frequently Asked Questions (FAQ)

Q: Can LP2954AIT/NOPB directly replace LP2954IT without PCB modifications?

A: Yes. The LP2954AIT/NOPB is pin-compatible with identical TO-220-3 package configuration, electrical specifications, and mounting requirements. No PCB layout changes are required.

Q: What is the difference between LP2954IT/NOPB and LP2954AIT/NOPB?

A: Both parts provide identical electrical performance and package configuration. The primary difference is RoHS compliance status: LP2954AIT/NOPB is ROHS3 compliant while LP2954IT/NOPB compliance status is not specified. LP2954AIT/NOPB is recommended for new designs.

Q: Can MIC2954-02WT or MIC2954-03WT replace LP2954IT?

A: Yes. These Microchip parts are pin-compatible TO-220-3 regulators with identical 250mA output current and 5V fixed output. They feature improved voltage dropout (0.6V versus 0.8V) and ROHS3 compliance. Electrical performance is equivalent or superior.

Q: Why do some substitute parts have higher current ratings?

A: Higher current variants (MIC2920A through MIC29500) are offered for design flexibility. Applications requiring only 250mA can use these parts without performance degradation. The higher current capability provides design margin and future scalability.

Q: Are all substitute parts ROHS3 compliant?

A: All Microchip Technology substitutes and the LP2954AIT/NOPB are ROHS3 compliant. The LP2954IT/NOPB compliance status is not specified in available documentation.

Q: What is the maximum input voltage difference between LP2954IT and Microchip substitutes?

A: The LP2954IT and MIC2954 variants support 30V maximum input voltage. Other Microchip parts (MIC2920A, MIC2937A, MIC2940A, MIC29150, MIC29300, MIC29500) support 26V maximum input voltage. Verify application input voltage requirements before selection.

Q: Do all substitute parts include reverse polarity protection?

A: The LP2954IT, LP2954IT/NOPB, LP2954AIT/NOPB, and all Microchip MIC2954, MIC2920A, MIC2937A, MIC2940A, MIC29150, MIC29300, and MIC29500 variants include reverse polarity protection as specified in their protection feature sets.