LP2989AIM-1.8 Equivalent & Substitute Parts

Part Overview

The LP2989AIM-1.8 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.8V output applications with 500mA current capacity in an 8-SOIC surface mount package. This part is classified as "Not For New Designs," making identification of equivalent and substitute parts essential for ongoing production support, maintenance applications, and design transitions. The device provides integrated protection features including over-current, over-temperature, and short-circuit protection, with an enable control feature for power management flexibility.

Substiute Parts

LP2989AIM-1.8

Texas InstrumentsIn Stock: 4886LP2989AIM-1.8 Datasheet

Current PartRFQ

LP2989AIM-1.8/NOPB

Texas InstrumentsIn Stock: 892LP2989AIM-1.8/NOPB Datasheet

DirectRFQ

LP2989IM-1.8/NOPB

Texas InstrumentsIn Stock: 1955LP2989IM-1.8/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LP2989AIM-1.8 is determined by strict equivalence across the following critical parameters:

• Output voltage specification: 1.8V fixed
• Output current capability: 500mA minimum
• Input voltage tolerance: 16V maximum
• Voltage dropout performance: 0.65V @ 500mA maximum
• Package compatibility: 8-SOIC form factor
• Quiescent current: 175 µA
• PSRR performance: 60dB (1kHz)
• Operating temperature range: -40°C ~ 125°C
• Protection and control features: Over-current, over-temperature, short-circuit protection with enable function

All identified substitutes maintain identical electrical specifications and mechanical compatibility with the original part number, ensuring direct replacement capability in existing designs and PCB layouts.

Parameter Comparison

Engineering Selection Recommendations

The LP2989AIM-1.8 is marked "Not For New Designs," indicating end-of-life status. For applications requiring this regulator, the following substitutes are available:

LP2989AIM-1.8/NOPB is the direct manufacturer equivalent with identical electrical and mechanical specifications. This part carries Active product status and ROHS3 compliance certification, making it suitable for both legacy support and new production runs. The "/NOPB" suffix indicates lead-free, halogen-free packaging in tube format.

LP2989IM-1.8/NOPB is a parametric equivalent offering identical electrical performance and package compatibility. This variant also maintains Active product status and ROHS3 compliance. The different suffix designation reflects manufacturing process variations while maintaining full functional equivalence.

Both substitutes provide superior compliance posture compared to the original part, with ROHS3 certification and active manufacturer support. Selection between LP2989AIM-1.8/NOPB and LP2989IM-1.8/NOPB depends on inventory availability and supply chain requirements, as both deliver equivalent performance in the 1.8V, 500mA linear regulator application.

Frequently Asked Questions (FAQ)

Q: Can LP2989AIM-1.8/NOPB directly replace LP2989AIM-1.8 in existing designs?

A: Yes. Both parts share identical electrical specifications, output voltage, current capacity, dropout voltage, quiescent current, PSRR, operating temperature range, and protection features. The 8-SOIC package dimensions are identical, enabling direct PCB substitution without layout modifications.

Q: What is the difference between LP2989AIM-1.8/NOPB and LP2989IM-1.8/NOPB?

A: Both parts are parametric equivalents with identical electrical performance and package compatibility. The suffix variation reflects different manufacturing process designations from Texas Instruments. Electrical specifications, output voltage, current capacity, and all performance parameters remain equivalent. Selection is based on supply availability.

Q: Why is the original LP2989AIM-1.8 marked "Not For New Designs"?

A: This designation indicates the part has reached end-of-life status. Texas Instruments recommends using active alternatives for new designs. The substitute parts LP2989AIM-1.8/NOPB and LP2989IM-1.8/NOPB maintain Active product status with ongoing manufacturer support.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both LP2989AIM-1.8/NOPB and LP2989IM-1.8/NOPB carry ROHS3 compliance certification, whereas the original LP2989AIM-1.8 is RoHS non-compliant. This provides improved environmental and regulatory compliance for production applications.

Q: What packaging formats are available for the substitutes?

A: Both substitute parts are supplied in Tube packaging format. The original part packaging type was not specified. All three part numbers use the same 8-SOIC surface mount package with 0.154" width (3.90mm).

Q: Can these parts be used interchangeably in production?

A: Yes. All three part numbers deliver identical electrical performance in 1.8V, 500mA linear regulator applications. PCB layout, schematic connections, and thermal management requirements remain unchanged. The substitutes offer the advantage of active product status and improved compliance certifications.