LP2985AIM5-3.1 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2985AIM5-3.1 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This device delivers 150mA output current with a fixed 3.1V output and operates across an input voltage range up to 16V. The part is classified as Obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity. Equivalent parts maintain identical electrical performance and package compatibility while offering improved availability or compliance status.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.1V
Output Current	150mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.58V @ 150mA
Quiescent Current	95 µA
PSRR	45dB (1kHz)
Package	SOT-23-5 (SC-74A)
Operating Temperature	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitute parts for the LP2985AIM5-3.1 are qualified based on the following critical parameters that determine functional equivalence:

Fixed output voltage of 3.1V
Output current capability of 150mA
Maximum input voltage of 16V
Dropout voltage of 0.58V @ 150mA
Quiescent current of 95 µA
PSRR of 45dB (1kHz)
SOT-23-5 package configuration
Operating temperature range of -40°C to 125°C
Identical protection features (Over Current, Over Temperature, Short Circuit)
Enable control feature

All identified substitutes maintain these electrical and mechanical specifications, ensuring direct compatibility in existing circuit designs without modification.

Parameter Comparison

Parameter	LP2985AIM5-3.1	LP2985AIM5-3.1/NOPB	LP2985AIM5X-3.1/NOPB	LP2985IM5-3.1/NOPB
Manufacturer	Texas Instruments	National Semiconductor	Texas Instruments	Texas Instruments
Output Voltage	3.1V	3.1V	3.1V	3.1V
Output Current	150mA	150mA	150mA	150mA
Input Voltage (Max)	16V	16V	16V	16V
Dropout Voltage (Max)	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA
Quiescent Current	95 µA	95 µA	95 µA	95 µA
PSRR	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)
Package	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Product Status	Obsolete	Active	Last Time Buy	Active
RoHS Status	Non-compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	Standard	Standard	Cut Tape (CT)	Tape & Reel (TR)

Engineering Selection Recommendations

LP2985AIM5-3.1/NOPB (National Semiconductor): This direct manufacturer equivalent maintains all electrical specifications and is currently in Active product status with substantial inventory availability (23,200 pcs). Selection of this part provides immediate design continuity for the Obsolete LP2985AIM5-3.1.

LP2985AIM5X-3.1/NOPB (Texas Instruments): This parametric equivalent carries Last Time Buy status and is ROHS3 compliant, addressing environmental compliance requirements. Inventory is available at 6,952 pcs. This option is suitable for designs requiring RoHS compliance certification.

LP2985IM5-3.1/NOPB (Texas Instruments): This parametric equivalent is in Active product status with ROHS3 compliance. Inventory availability is 1,692 pcs. This part is appropriate for new designs or production runs requiring both active product status and environmental compliance.

All three substitutes are electrically and mechanically equivalent to the original LP2985AIM5-3.1, with differences limited to product lifecycle status, compliance certifications, and packaging formats.

Frequently Asked Questions (FAQ)

Q: Can LP2985AIM5-3.1/NOPB be used as a direct replacement for LP2985AIM5-3.1?

A: Yes. Both parts share identical electrical specifications including 3.1V fixed output, 150mA current capability, 0.58V dropout voltage, and SOT-23-5 packaging. The primary difference is product status and manufacturer designation.

Q: What is the difference between LP2985AIM5X-3.1/NOPB and LP2985IM5-3.1/NOPB?

A: Both are parametric equivalents with identical electrical performance. LP2985AIM5X-3.1/NOPB is in Last Time Buy status with Cut Tape packaging, while LP2985IM5-3.1/NOPB is Active with Tape & Reel packaging. Both are ROHS3 compliant.

Q: Does packaging format affect electrical performance?

A: No. Cut Tape (CT) and Tape & Reel (TR) packaging formats are mechanical variations only. Electrical specifications and SOT-23-5 package dimensions remain identical across all substitutes.

Q: Are all substitutes RoHS compliant?

A: LP2985AIM5X-3.1/NOPB and LP2985IM5-3.1/NOPB are ROHS3 compliant. LP2985AIM5-3.1/NOPB compliance status is not specified in available documentation.

Q: Which substitute offers the best long-term availability?

A: LP2985AIM5-3.1/NOPB (National Semiconductor) offers the highest current inventory at 23,200 pcs and Active product status, providing the most reliable long-term supply option.

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

A: Yes. All substitutes maintain identical SOT-23-5 pinout and electrical specifications, enabling direct PCB-level substitution without circuit modification.

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