LP2989IM-3.3 Equivalent & Substitute Parts

Part Overview

The LP2989IM-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output applications with 500mA current capacity in an 8-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Direct manufacturer alternatives and parametric equivalents are available to maintain functional compatibility in existing designs.

Substiute Parts

LP2989IM-3.3

Texas InstrumentsIn Stock: 2182LP2989IM-3.3 Datasheet

Current PartRFQ

LP2989IM-3.3/NOPB

Texas InstrumentsIn Stock: 2017LP2989IM-3.3/NOPB Datasheet

DirectRFQ

LP2989AIM-3.3/NOPB

Texas InstrumentsIn Stock: 3095LP2989AIM-3.3/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP2989IM-3.3 are classified based on the following substitution criteria:

Direct Manufacturer Equivalent (NOPB Variant): LP2989IM-3.3/NOPB maintains identical electrical specifications and package configuration. The NOPB designation indicates lead-free, halogen-free packaging. This part is active in production and represents the direct replacement path from the obsolete LP2989IM-3.3.

Parametric Equivalent (Industrial Grade): LP2989AIM-3.3/NOPB is a parametric equivalent with identical output voltage, current capacity, dropout voltage, quiescent current, PSRR, protection features, and package dimensions. The "A" suffix indicates industrial-grade temperature and performance specifications. This part is active in production.

Substitution Logic: All substitute parts maintain the following critical parameters:

• Fixed 3.3V output voltage
• 500mA output current capability
• 0.65V maximum dropout voltage @ 500mA
• 175 µA quiescent current
• 60dB PSRR @ 1kHz
• 8-SOIC package (0.154", 3.90mm Width)
• Over Current, Over Temperature, and Short Circuit protection
• Enable control feature
• -40°C ~ 125°C operating temperature range

Parameter Comparison

Engineering Selection Recommendations

For New Designs and Procurement: LP2989IM-3.3/NOPB is the recommended direct replacement. It maintains full electrical and mechanical compatibility with the obsolete LP2989IM-3.3 while offering ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements.

For Industrial Applications: LP2989AIM-3.3/NOPB provides identical functional performance with industrial-grade specifications. Both active alternatives are suitable for applications requiring the specified 3.3V output, 500mA current capacity, and 8-SOIC package configuration.

Compliance Considerations: Both substitute parts are ROHS3 compliant and REACH unaffected, addressing the regulatory limitations of the obsolete original part. Selection between LP2989IM-3.3/NOPB and LP2989AIM-3.3/NOPB depends on application-specific industrial requirements and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can LP2989IM-3.3/NOPB be used as a direct replacement for LP2989IM-3.3? A: Yes. LP2989IM-3.3/NOPB maintains identical electrical specifications, output voltage, current capacity, dropout voltage, quiescent current, PSRR, protection features, and 8-SOIC package dimensions. The primary differences are product status (active vs. obsolete) and regulatory compliance (ROHS3 compliant, REACH unaffected).

Q: What is the difference between LP2989IM-3.3/NOPB and LP2989AIM-3.3/NOPB? A: Both parts are parametric equivalents with identical electrical performance and package configuration. The "A" suffix in LP2989AIM-3.3/NOPB indicates industrial-grade specifications. Both are active in production and ROHS3 compliant.

Q: Are the substitute parts pin-compatible with the original LP2989IM-3.3? A: Yes. All substitute parts use the same 8-SOIC package with 0.154" width and 3.90mm dimensions, ensuring pin-for-pin compatibility.

Q: What are the key parameters that determine substitutability? A: Fixed 3.3V output voltage, 500mA output current, 0.65V maximum dropout voltage, 175 µA quiescent current, 60dB PSRR, 8-SOIC package, and protection features (Over Current, Over Temperature, Short Circuit) are the critical parameters for substitution.

Q: Why is the original LP2989IM-3.3 listed as obsolete? A: The original part is no longer in active production. Active alternatives LP2989IM-3.3/NOPB and LP2989AIM-3.3/NOPB are available to support existing designs and new applications.

Q: Are there any thermal or performance differences between the substitute parts? A: No. Both substitute parts maintain the identical operating temperature range (-40°C ~ 125°C), quiescent current (175 µA), and thermal protection features as the original part.