LP2989IMX-3.3/NOPB Equivalent & Substitute Parts

Part Overview

The LP2989IMX-3.3/NOPB is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed 3.3V output at 500mA with an 8-SOIC package configuration. The part is currently marked as Obsolete, making identification of equivalent and substitute components essential for ongoing design support, production continuity, and system maintenance. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer functional alternatives with modified parameters that remain compatible within the application envelope.

Substiute Parts

LP2989IMX-3.3/NOPB

Texas InstrumentsIn Stock: 2170LP2989IMX-3.3/NOPB Datasheet

Current PartRFQ

TPS7A2633DRVR

Texas InstrumentsIn Stock: 9128TPS7A2633DRVR Datasheet

MFR RecommendedRFQ

LP2989AIMX-3.3/NOPB

Texas InstrumentsIn Stock: 2081LP2989AIMX-3.3/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP2989IMX-3.3/NOPB are identified based on the following critical parameters that determine functional compatibility:

Electrical Compatibility Criteria:

• Fixed output voltage of 3.3V
• Output current rating of 500mA or greater
• Maximum input voltage of 16V or greater
• Operating temperature range of -40°C to 125°C or wider
• Positive output configuration with fixed output type
• Single regulator configuration

Mechanical Compatibility Criteria:

• Surface mount mounting type
• Package footprint compatibility or functional equivalence

Compliance Criteria:

• ROHS3 compliance
• Active or Last Time Buy product status (preferred over Obsolete)

Substitutes are grouped into two categories: MFR Recommended (manufacturer-endorsed alternatives with enhanced performance) and Parametric Equivalents (parts with identical core specifications but different product lifecycle status).

Parameter Comparison

Engineering Selection Recommendations

MFR Recommended Substitute: TPS7A2633DRVR

The TPS7A2633DRVR is the manufacturer-endorsed alternative for the obsolete LP2989IMX-3.3/NOPB. This part maintains the same 3.3V fixed output and 500mA current rating while offering significant performance improvements: reduced dropout voltage (0.33V vs. 0.65V), substantially lower quiescent current (4.5 µA vs. 175 µA), and enhanced PSRR performance. The device carries Active product status, ensuring long-term availability and ongoing manufacturer support. It includes additional control features (Power Good output) and enhanced protection (UVLO). The primary design consideration is the package change from 8-SOIC to 6-WDFN Exposed Pad, which requires PCB layout modification but provides superior thermal performance. This substitute is suitable for new designs and production transitions where PCB redesign is feasible.

Parametric Equivalent: LP2989AIMX-3.3/NOPB

The LP2989AIMX-3.3/NOPB provides an identical electrical and mechanical specification match to the main part, maintaining the same 8-SOIC package footprint for direct PCB compatibility. This part carries Last Time Buy status, indicating limited future availability. It is suitable for immediate replacement in existing designs where PCB modification is not possible and where remaining inventory supports the product lifecycle. This option preserves the original design without requiring layout changes.

Selection Criteria:

• Choose TPS7A2633DRVR for new designs, production transitions, or applications where improved efficiency and thermal performance justify PCB redesign.
• Choose LP2989AIMX-3.3/NOPB for direct replacement in existing production where package compatibility is mandatory and design changes are not feasible.
• All substitutes maintain ROHS3 compliance and the required operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the TPS7A2633DRVR be used as a direct drop-in replacement for the LP2989IMX-3.3/NOPB?

A: The TPS7A2633DRVR is functionally equivalent but not a direct PCB drop-in due to package differences (6-WDFN Exposed Pad vs. 8-SOIC). PCB layout modification is required. The electrical specifications are compatible, and the substitute offers improved performance characteristics.

Q: What are the key differences between the MFR Recommended and Parametric Equivalent substitutes?

A: The TPS7A2633DRVR (MFR Recommended) offers enhanced performance with lower dropout voltage and quiescent current, but requires package redesign. The LP2989AIMX-3.3/NOPB (Parametric Equivalent) maintains identical specifications and package compatibility but has limited availability due to Last Time Buy status.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. Both the TPS7A2633DRVR and LP2989AIMX-3.3/NOPB are ROHS3 compliant, matching the compliance status of the main part.

Q: What is the impact of the reduced dropout voltage in the TPS7A2633DRVR?

A: The TPS7A2633DRVR features a dropout voltage of 0.33V compared to 0.65V in the original part. This improvement reduces power dissipation and heat generation, particularly beneficial in applications with limited input voltage headroom or high ambient temperatures.

Q: Does the package change from 8-SOIC to 6-WDFN affect thermal performance?

A: Yes. The 6-WDFN package with exposed pad provides superior thermal characteristics compared to 8-SOIC, enabling better heat dissipation. This is advantageous for applications operating at maximum current or elevated ambient temperatures.

Q: Can the LP2989AIMX-3.3/NOPB be used indefinitely?

A: The LP2989AIMX-3.3/NOPB carries Last Time Buy status, indicating that manufacturer production will cease after a specified date. Inventory planning should account for this limited availability window.

Q: What protection features are included in each substitute?

A: The LP2989AIMX-3.3/NOPB includes Over Current, Over Temperature, and Short Circuit protection. The TPS7A2633DRVR includes Over Current, Over Temperature, and UVLO (Under Voltage Lock Out) protection, providing additional safeguards against low input voltage conditions.