LP2989IM-2.5 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2989IM-2.5 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 2.5V output applications with 500mA current capacity in an 8-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The device provides regulated power management with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for applications requiring stable low-voltage power distribution.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	500mA
Input Voltage (Max)	16V
Voltage Dropout (Max)	0.65V @ 500mA
Quiescent Current	175 µA
Package	8-SOIC (0.154", 3.90mm Width)
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitution for the LP2989IM-2.5 is determined by strict equivalence across the following critical parameters: fixed output voltage of 2.5V, minimum output current of 500mA, maximum input voltage of 16V, identical 8-SOIC package configuration, and operating temperature range of -40°C to 125°C. All identified substitutes maintain these core electrical and mechanical specifications, ensuring functional compatibility in existing circuit designs. Substitutes are grouped into two categories: direct manufacturer equivalents from Texas Instruments (LP2989IM-2.5/NOPB and LP2989AIM-2.5/NOPB) and parametric equivalents from alternative manufacturers (MIC5209-2.5YM-TR from Microchip Technology).

Parameter Comparison

Parameter	LP2989IM-2.5	LP2989IM-2.5/NOPB	LP2989AIM-2.5/NOPB	MIC5209-2.5YM-TR
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Microchip Technology
Output Voltage	2.5V	2.5V	2.5V	2.5V
Output Current	500mA	500mA	500mA	500mA
Input Voltage (Max)	16V	16V	16V	16V
Voltage Dropout (Max)	0.65V @ 500mA	0.65V @ 500mA	0.65V @ 500mA	0.6V @ 500mA
Quiescent Current	175 µA	175 µA	175 µA	170 µA
PSRR	60dB (1kHz)	60dB (1kHz)	60dB (1kHz)	75dB (120Hz)
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Product Status	Obsolete	Active	Active	Active
RoHS Compliance	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For new designs and production transitions, LP2989IM-2.5/NOPB and LP2989AIM-2.5/NOPB are preferred substitutes as they are active products from the original manufacturer Texas Instruments with identical electrical specifications and ROHS3 compliance. Both parts maintain the same output voltage, current rating, dropout voltage, and quiescent current as the obsolete LP2989IM-2.5, ensuring direct functional replacement without circuit modification.

MIC5209-2.5YM-TR from Microchip Technology is a parametric equivalent that meets all critical electrical and mechanical requirements. This part offers improved performance characteristics including lower dropout voltage (0.6V vs 0.65V) and higher PSRR (75dB at 120Hz vs 60dB at 1kHz), while maintaining identical output specifications and package configuration. MIC5209-2.5YM-TR is also ROHS3 compliant and actively produced.

All three substitute parts are available in active production status with confirmed inventory, supporting both immediate procurement and long-term supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can LP2989IM-2.5/NOPB directly replace LP2989IM-2.5 in existing designs?

A: Yes. LP2989IM-2.5/NOPB is a direct equivalent with identical electrical specifications, output voltage, current rating, dropout voltage, and 8-SOIC package. The primary difference is product status (active vs obsolete) and RoHS compliance (ROHS3 vs non-compliant). No circuit modifications are required.

Q: What is the difference between LP2989IM-2.5/NOPB and LP2989AIM-2.5/NOPB?

A: Both parts are Texas Instruments products with identical electrical specifications and package configuration. The difference lies in the device grade designation (IM vs AIM), which may reflect different manufacturing processes or quality grades. Both are active products with ROHS3 compliance and equivalent performance for this application.

Q: Is MIC5209-2.5YM-TR compatible with LP2989IM-2.5 designs?

A: Yes. MIC5209-2.5YM-TR meets all critical substitution parameters: 2.5V fixed output, 500mA current capacity, 16V maximum input, identical 8-SOIC package, and -40°C to 125°C operating range. The part offers improved dropout voltage and PSRR performance. No PCB layout changes are required due to identical package dimensions.

Q: What packaging differences exist among the substitute parts?

A: LP2989IM-2.5 has unspecified packaging. LP2989IM-2.5/NOPB is supplied in Tube packaging. LP2989AIM-2.5/NOPB is supplied in Tube packaging. MIC5209-2.5YM-TR is supplied in Tape & Reel (TR) format. All use identical 8-SOIC (0.154", 3.90mm Width) surface mount packages suitable for automated assembly.

Q: Are all substitute parts RoHS compliant?

A: LP2989IM-2.5/NOPB and LP2989AIM-2.5/NOPB are ROHS3 compliant. MIC5209-2.5YM-TR is ROHS3 compliant. The original LP2989IM-2.5 is RoHS non-compliant. For applications requiring RoHS compliance, use any of the three substitute parts.

Q: Which substitute offers the best performance?

A: MIC5209-2.5YM-TR provides superior performance with lower dropout voltage (0.6V vs 0.65V) and higher PSRR (75dB at 120Hz). However, all three substitutes meet the electrical requirements of the original part. Selection should be based on availability, supply chain preference, and compliance requirements rather than performance differences.

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