LP2989IMX-1.8 Equivalent & Substitute Parts

Part Overview

The LP2989IMX-1.8 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.8V output applications. This device delivers 500mA output current with a maximum dropout voltage of 0.65V at full load, making it suitable for low-voltage power supply circuits requiring stable regulation. The part is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements.

Substiute Parts

LP2989IMX-1.8

Texas InstrumentsIn Stock: 3698LP2989IMX-1.8 Datasheet

Current PartRFQ

LP2989AIMX-1.8/NOPB

National SemiconductorIn Stock: 3170LP2989AIMX-1.8/NOPB Datasheet

Parametric EquivalentRFQ

LP2989IMX-1.8/NOPB

Texas InstrumentsIn Stock: 2146LP2989IMX-1.8/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LP2989IMX-1.8 is determined by strict equivalence across the following critical parameters:

• Fixed output voltage of 1.8V
• Output current capability of 500mA
• Maximum input voltage rating of 16V
• Dropout voltage specification of 0.65V @ 500mA
• Identical 8-SOIC package footprint (0.154", 3.90mm Width)
• Operating temperature range of -40°C ~ 125°C
• Presence of Enable control feature
• Over Current, Over Temperature, and Short Circuit protection

Parts meeting all these criteria are classified as parametric equivalents and direct functional replacements. Packaging format (Bulk vs. Tape & Reel) does not affect electrical compatibility but may impact procurement and assembly workflows.

Parameter Comparison

Engineering Selection Recommendations

Both LP2989AIMX-1.8/NOPB and LP2989IMX-1.8/NOPB are active product alternatives to the obsolete LP2989IMX-1.8. Selection between these substitutes should be based on the following criteria:

LP2989IMX-1.8/NOPB (Texas Instruments): This part maintains the original manufacturer lineage and carries ROHS3 compliance certification, making it the preferred choice for applications requiring regulatory compliance. The Tape & Reel packaging format supports automated assembly processes.

LP2989AIMX-1.8/NOPB (National Semiconductor): This part provides parametric equivalence with identical electrical specifications. Bulk packaging format may be suitable for lower-volume applications or manual assembly workflows.

Both parts are electrically interchangeable with the obsolete LP2989IMX-1.8 and share identical pin configurations, package dimensions, and functional characteristics.

Frequently Asked Questions (FAQ)

Q: Can LP2989AIMX-1.8/NOPB and LP2989IMX-1.8/NOPB be used interchangeably with LP2989IMX-1.8?

A: Yes. Both substitute parts meet all electrical and mechanical parameters of the original part, including output voltage, current rating, dropout voltage, package footprint, and operating temperature range. Pin configuration and PCB layout compatibility are identical.

Q: What is the difference between Bulk and Tape & Reel packaging?

A: Packaging format affects procurement and assembly logistics. Tape & Reel packaging is optimized for automated pick-and-place assembly, while Bulk packaging is typically used for manual assembly or lower-volume applications. Electrical performance is unaffected.

Q: Why is the original LP2989IMX-1.8 marked as obsolete?

A: Obsolete status indicates the part is no longer manufactured by Texas Instruments. Active alternatives with identical specifications are available to support existing designs and new production requirements.

Q: Does RoHS compliance affect functional compatibility?

A: No. RoHS compliance relates to material composition and environmental regulations, not electrical function. Both RoHS-compliant and non-compliant parts deliver identical performance. Selection should align with application regulatory requirements.

Q: Are there any pin or footprint differences between these parts?

A: No. All three parts use the 8-SOIC package with identical pin assignments and 0.154" (3.90mm) width. Direct PCB substitution is possible without layout modifications.