LP2985IM5-3.1 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2985IM5-3.1 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.1V output applications with 150mA current capacity in SOT-23-5 surface mount packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part delivers low-noise, low-dropout regulation suitable for battery-powered and portable applications requiring stable 3.1V rails.

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 Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution for the LP2985IM5-3.1 is determined by strict electrical and mechanical parameter matching. All qualified substitutes must meet the following criteria:

Fixed output voltage of 3.1V
Minimum output current rating of 150mA
Maximum input voltage of 16V or greater
Dropout voltage not exceeding 0.58V @ 150mA
SOT-23-5 package compatibility
Operating temperature range of -40°C to 125°C minimum
Integrated protection features (Over Current, Over Temperature, Short Circuit)
Enable control functionality

The three identified substitutes satisfy all these parameters and are therefore electrically and mechanically interchangeable with the main part.

Parameter Comparison

Parameter	LP2985IM5-3.1	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

Engineering Selection Recommendations

For new designs and production continuity, LP2985IM5-3.1/NOPB (Tape & Reel packaging) is the primary recommended substitute. This part maintains active product status with Texas Instruments, carries ROHS3 compliance certification, and demonstrates current inventory availability of 1692 pieces. The identical electrical specifications and SOT-23-5 package ensure direct pin-for-pin compatibility.

LP2985AIM5X-3.1/NOPB serves as a secondary option for applications where Last Time Buy status is acceptable. This variant also provides ROHS3 compliance and higher inventory levels (6952 pieces), though procurement should account for its limited availability window.

LP2985AIM5-3.1/NOPB from National Semiconductor is electrically equivalent but lacks specified RoHS compliance documentation. This part maintains active status with substantial inventory (23200 pieces) and may be suitable for legacy system support where compliance requirements are not mandated.

Frequently Asked Questions (FAQ)

Q: Can LP2985IM5-3.1/NOPB be used as a direct replacement for LP2985IM5-3.1?

A: Yes. Both parts are identical in electrical specifications, output voltage (3.1V), current rating (150mA), dropout voltage (0.58V @ 150mA), and SOT-23-5 packaging. The primary difference is product status; LP2985IM5-3.1/NOPB maintains active availability while the original is obsolete.

Q: What is the difference between LP2985AIM5-3.1/NOPB and LP2985AIM5X-3.1/NOPB?

A: Both parts are electrically identical with matching 3.1V output, 150mA current capacity, and SOT-23-5 packaging. The primary distinction is packaging format: LP2985AIM5-3.1/NOPB is supplied by National Semiconductor, while LP2985AIM5X-3.1/NOPB is from Texas Instruments in Cut Tape format. LP2985AIM5X-3.1/NOPB carries ROHS3 compliance certification.

Q: Are all substitute parts compatible with the original PCB layout?

A: Yes. All substitute parts use identical SOT-23-5 (SC-74A) packaging with matching pin configurations, enabling direct PCB footprint compatibility without layout modifications.

Q: Which substitute should be selected for RoHS-compliant applications?

A: LP2985IM5-3.1/NOPB and LP2985AIM5X-3.1/NOPB both carry ROHS3 compliance certification. LP2985IM5-3.1/NOPB is recommended as the primary choice due to active product status and established supply chain availability.

Q: What is the inventory status of each substitute?

A: LP2985IM5-3.1/NOPB has 1692 pieces in stock (Active status). LP2985AIM5X-3.1/NOPB has 6952 pieces available (Last Time Buy status). LP2985AIM5-3.1/NOPB has 23200 pieces in stock (Active status). Selection should account for long-term availability requirements and compliance mandates.

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