LP2989IMX-3.3 Equivalent & Substitute Parts

Part Overview

The LP2989IMX-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output applications with 500mA current capacity. This device operates in the Power Management (PMIC) category and is housed in an 8-SOIC surface mount package. The main part is currently listed as Obsolete, making identification of equivalent and substitute parts essential for ongoing design support and component procurement.

Substiute Parts

LP2989IMX-3.3

Texas InstrumentsIn Stock: 2409LP2989IMX-3.3 Datasheet

Current PartRFQ

LP2989AIMX-3.3/NOPB

Texas InstrumentsIn Stock: 2081LP2989AIMX-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP2989IMX-3.3/NOPB

National SemiconductorIn Stock: 2144LP2989IMX-3.3/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP2989IMX-3.3 are qualified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

• Fixed output voltage of 3.3V
• Output current rating of 500mA
• Maximum input voltage of 16V
• Voltage dropout specification of 0.65V @ 500mA
• Quiescent current of 175 µA
• PSRR of 60dB (1kHz)
• 8-SOIC package configuration (0.154", 3.90mm Width)
• Operating temperature range of -40°C ~ 125°C
• Identical protection features (Over Current, Over Temperature, Short Circuit)
• Enable control feature

All identified substitutes maintain these electrical and mechanical specifications, ensuring functional equivalence in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The LP2989IMX-3.3 is classified as Obsolete. For new designs and ongoing procurement, the LP2989IMX-3.3/NOPB from National Semiconductor is recommended as the primary substitute due to its Active product status. This part maintains all electrical and mechanical specifications while ensuring long-term availability.

The LP2989AIMX-3.3/NOPB from Texas Instruments serves as an alternative substitute with Last Time Buy status. This part is suitable for designs requiring Texas Instruments sourcing or existing supply chain relationships, though availability may be limited.

Both substitutes are ROHS3 Compliant and REACH Unaffected, meeting current regulatory requirements. Selection between substitutes should be based on supply chain availability, procurement lead times, and existing component qualification documentation.

Frequently Asked Questions (FAQ)

Q: Can LP2989AIMX-3.3/NOPB be used as a direct replacement for LP2989IMX-3.3?

A: Yes. The LP2989AIMX-3.3/NOPB maintains identical electrical specifications including 3.3V fixed output, 500mA current capacity, 0.65V dropout voltage, and 8-SOIC package configuration. The primary difference is product status (Last Time Buy vs. Obsolete) and packaging format (Cut Tape & Digi-Reel vs. standard).

Q: What is the difference between LP2989IMX-3.3/NOPB and the original LP2989IMX-3.3?

A: Both parts are electrically and mechanically equivalent. The /NOPB designation indicates lead-free (Pb-free) compliance. The LP2989IMX-3.3/NOPB from National Semiconductor carries Active product status, ensuring continued availability and support.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the 8-SOIC package with identical pinout and mechanical dimensions (0.154", 3.90mm Width), ensuring direct PCB compatibility without layout modifications.

Q: Which substitute should be selected for new designs?

A: The LP2989IMX-3.3/NOPB is recommended for new designs due to Active product status and assured long-term availability. This part eliminates obsolescence risk while maintaining full functional equivalence.

Q: Do all substitutes meet the same compliance standards?

A: Yes. All three parts are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements. ECCN classification (EAR99) and HTSUS code (8542.39.0001) are identical across all parts.