LP2989AIMX-3.3 Equivalent & Substitute Parts

Part Overview

The LP2989AIMX-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. It delivers 500mA output current at a fixed 3.3V output with low dropout voltage of 0.65V at maximum load. The device integrates over-current, over-temperature, and short-circuit protection features, making it suitable for micropower and low-noise applications requiring regulated 3.3V supply rails.

The main part number LP2989AIMX-3.3 carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this regulator.

Key Parameters

Parameter	Value
Output Configuration	Positive
Output Type	Fixed
Number of Regulators	1
Voltage - Input (Max)	16V
Voltage - Output (Min/Fixed)	3.3V
Voltage Dropout (Max)	0.65V @ 500mA
Current - Output	500mA
Current - Quiescent (Iq)	175 µA
Current - Supply (Max)	9 mA
PSRR	60dB (1kHz)
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LP2989AIMX-3.3 are identified based on strict electrical and mechanical parameter matching. The substitution criteria are:

Output voltage fixed at 3.3V
Output current capability of 500mA
Maximum input voltage of 16V
Dropout voltage of 0.65V at 500mA
Quiescent current of 175 µA
PSRR of 60dB at 1kHz
Protection features: Over Current, Over Temperature, Short Circuit
Enable control feature
Operating temperature range -40°C to 125°C
8-SOIC surface mount package (0.154", 3.90mm Width)
ROHS3 compliance

The identified substitutes maintain full electrical equivalence across all critical parameters while differing only in product status and packaging format.

Parameter Comparison

Parameter	LP2989AIMX-3.3	LP2989AIMX-3.3/NOPB	LP2989IMX-3.3/NOPB
Manufacturer	Texas Instruments	Texas Instruments	National Semiconductor
Product Status	Obsolete	Last Time Buy	Active
Output Configuration	Positive	Positive	Positive
Output Type	Fixed	Fixed	Fixed
Voltage - Output (Min/Fixed)	3.3V	3.3V	3.3V
Voltage - Input (Max)	16V	16V	16V
Voltage Dropout (Max)	0.65V @ 500mA	0.65V @ 500mA	0.65V @ 500mA
Current - Output	500mA	500mA	500mA
Current - Quiescent (Iq)	175 µA	175 µA	175 µA
Current - Supply (Max)	9 mA	9 mA	9 mA
PSRR	60dB (1kHz)	60dB (1kHz)	60dB (1kHz)
Control Features	Enable	Enable	Enable
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For applications currently using the LP2989AIMX-3.3, the following selection guidance applies:

LP2989AIMX-3.3/NOPB is the direct equivalent with identical electrical specifications and package format. This part carries Last Time Buy status, indicating limited future availability. It is suitable for immediate replacement in existing designs and maintains full compatibility with current PCB layouts and thermal management strategies.

LP2989IMX-3.3/NOPB is the long-term alternative, carrying Active product status from National Semiconductor. This part provides identical electrical performance and package compatibility. The Active status ensures sustained availability for ongoing production and future design iterations. Both parts maintain ROHS3 compliance and unlimited moisture sensitivity rating, supporting deployment in standard manufacturing environments.

Frequently Asked Questions (FAQ)

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

A: Yes. Both parts are electrically and mechanically identical. The /NOPB designation indicates lead-free plating and packaging format differences only. All electrical parameters, output voltage, current ratings, protection features, and thermal characteristics are equivalent.

Q: What is the difference between LP2989AIMX-3.3/NOPB and LP2989IMX-3.3/NOPB?

A: Both parts deliver identical electrical performance and operate in the same 8-SOIC package. The primary difference is product status: LP2989AIMX-3.3/NOPB is Last Time Buy, while LP2989IMX-3.3/NOPB is Active. For new designs or long-term production, LP2989IMX-3.3/NOPB is recommended due to sustained availability.

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). PCB layouts and footprints are directly interchangeable.

Q: Do these parts require different PCB layout considerations?

A: No. All three parts share identical package specifications, thermal characteristics, and electrical requirements. Existing PCB designs require no modification for substitution.

Q: What compliance certifications apply to all substitute parts?

A: All three parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating. They meet the same regulatory and environmental standards.

Q: Which part should be selected for new production designs?

A: LP2989IMX-3.3/NOPB is recommended for new designs due to Active product status, ensuring long-term availability and supply chain stability.

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