LP2989AIM-3.3 Equivalent & Substitute Parts

Part Overview

The LP2989AIM-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 identification of equivalent and substitute components essential for ongoing design support and production continuity. Direct manufacturer equivalents and parametric alternatives are available to maintain design functionality and performance specifications.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	3.3V
Output Current	500mA
Input Voltage (Max)	16V
Voltage Dropout (Max)	0.65V @ 500mA
Quiescent Current	175 µA
PSRR	60dB (1kHz)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitute parts for the LP2989AIM-3.3 are identified based on matching electrical and mechanical parameters. The primary substitution criteria are:

Fixed output voltage of 3.3V
Output current capacity 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
Protection features: Over Current, Over Temperature, Short Circuit
Enable control feature

Parts meeting all these parameters are classified as direct equivalents or parametric equivalents. Product status and compliance certifications are secondary factors for selection based on application requirements.

Parameter Comparison

Parameter	LP2989AIM-3.3	LP2989AIM-3.3/NOPB	LP2989IM-3.3/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Output Voltage (Fixed)	3.3V	3.3V	3.3V
Output Current	500mA	500mA	500mA
Input Voltage (Max)	16V	16V	16V
Voltage Dropout (Max)	0.65V @ 500mA	0.65V @ 500mA	0.65V @ 500mA
Quiescent Current	175 µA	175 µA	175 µA
PSRR	60dB (1kHz)	60dB (1kHz)	60dB (1kHz)
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Operating Temperature Range	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Control Features	Enable	Enable	Enable
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	Not specified	Tube	Tube

Engineering Selection Recommendations

For applications currently using the LP2989AIM-3.3, the following selection criteria apply:

LP2989AIM-3.3/NOPB is the direct manufacturer equivalent with identical electrical specifications. This part is classified as active and ROHS3 compliant, providing improved regulatory compliance compared to the obsolete original part. Tube packaging is specified for this variant.

LP2989IM-3.3/NOPB is a parametric equivalent meeting all electrical and mechanical specifications. This part is also active and ROHS3 compliant. Selection between LP2989AIM-3.3/NOPB and LP2989IM-3.3/NOPB should be based on availability, lead time, and specific procurement requirements, as both provide equivalent functional performance.

For new designs or production transitions, either active part (LP2989AIM-3.3/NOPB or LP2989IM-3.3/NOPB) is preferred over the obsolete LP2989AIM-3.3 due to active product status and ROHS3 compliance certification.

Frequently Asked Questions (FAQ)

Q: Can LP2989AIM-3.3/NOPB directly replace LP2989AIM-3.3?

A: Yes. LP2989AIM-3.3/NOPB is a direct manufacturer equivalent with identical electrical parameters, output voltage, current capacity, dropout voltage, quiescent current, PSRR, package configuration, and operating temperature range. The primary differences are product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between LP2989AIM-3.3/NOPB and LP2989IM-3.3/NOPB?

A: Both parts are parametric equivalents with identical electrical specifications and package configuration. The difference lies in the part number designation (AIM vs. IM), which reflects internal Texas Instruments product line differentiation. Both are active, ROHS3 compliant, and suitable for direct substitution in applications requiring 3.3V, 500mA linear regulation.

Q: Is the 8-SOIC package identical across all three parts?

A: Yes. All three parts use the 8-SOIC package with 0.154" width and 3.90mm dimensions. PCB layout and footprint compatibility are maintained across LP2989AIM-3.3, LP2989AIM-3.3/NOPB, and LP2989IM-3.3/NOPB.

Q: Why is the original LP2989AIM-3.3 marked as obsolete?

A: Product obsolescence is determined by Texas Instruments based on market demand and product lifecycle management. Active equivalents (LP2989AIM-3.3/NOPB and LP2989IM-3.3/NOPB) are available to support continued design requirements and production needs.

Q: Are there RoHS compliance differences between the substitute parts?

A: The original LP2989AIM-3.3 is RoHS non-compliant. Both substitute parts (LP2989AIM-3.3/NOPB and LP2989IM-3.3/NOPB) are ROHS3 compliant, meeting current environmental and regulatory requirements for electronic components.

Q: Can these parts be used interchangeably in existing designs?

A: Yes. All three parts meet identical electrical specifications, output voltage, current capacity, dropout voltage, quiescent current, PSRR, and operating temperature requirements. Pin configuration and package dimensions are identical, enabling direct substitution without design modification.

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