LM1117MP-2.85/NOPB Equivalent & Substitute Parts

Part Overview

The LM1117MP-2.85/NOPB is a linear voltage regulator IC from Texas Instruments designed to deliver a fixed 2.85V output at up to 800mA. This Surface Mount device in SOT-223 packaging is classified as Obsolete, making identification of functionally equivalent alternatives essential for ongoing production and maintenance applications. The part provides Over Current and Over Temperature protection features suitable for power management applications requiring stable low-voltage regulation.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM1117MP-2.85/NOPB
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	2.85V
Output Current	800mA
Input Voltage (Max)	15V
Voltage Dropout (Max)	1.2V @ 800mA
Package / Case	TO-261-4, TO-261AA (SOT-223)
Mounting Type	Surface Mount
Operating Temperature	0°C ~ 125°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LM1117MP-2.85/NOPB is determined by the following critical parameters:

Fixed output voltage of 2.85V
Output current capability of 800mA
Maximum input voltage rating of 10V or higher
SOT-223 package compatibility (TO-261-4 or TO-261AA)
Surface Mount configuration
Over Current and Over Temperature protection features
ROHS3 compliance and REACH Unaffected status

Parts meeting these criteria are considered direct functional equivalents. Variations in quiescent current, PSRR performance, and operating temperature range do not preclude substitution when the core electrical and mechanical parameters align.

Parameter Comparison

Parameter	LM1117MP-2.85/NOPB	REG1117-2.85	REG1117-2.85/2K5	LT1117CST-2.85#PBF	LT1117CST-2.85#TRPBF
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.
Output Voltage	2.85V	2.85V	2.85V	2.85V	2.85V
Output Current	800mA	800mA	800mA	800mA	800mA
Input Voltage (Max)	15V	15V	15V	10V	10V
Voltage Dropout (Max)	1.2V @ 800mA	1.2V @ 800mA	1.2V @ 800mA	1.2V @ 800mA	1.2V @ 800mA
Current - Quiescent (Iq)	5 mA	10 mA	10 mA	10 mA	10 mA
PSRR (120Hz)	75dB	62dB	62dB	75dB	75dB
Package / Case	TO-261-4, TO-261AA	TO-261-4, TO-261AA	TO-261-4, TO-261AA	TO-261-4, TO-261AA	TO-261-4, TO-261AA
Supplier Device Package	SOT-223	SOT-223-4	SOT-223-4	SOT-223-3	SOT-223-3
Operating Temperature	0°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C
Product Status	Obsolete	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	-	Tube	Tape & Reel (TR)	Tube	Tape & Reel (TR)

Engineering Selection Recommendations

REG1117-2.85/2K5 is the primary recommended substitute. This part maintains identical electrical specifications to the LM1117MP-2.85/NOPB while offering Active product status, ensuring long-term availability and manufacturing support. The extended operating temperature range (-40°C ~ 125°C) provides additional margin for demanding environments. Tape & Reel packaging supports high-volume production workflows.

REG1117-2.85 serves as a secondary option with equivalent electrical performance and Obsolete status matching the original part. Tube packaging is suitable for lower-volume applications.

LT1117CST-2.85#TRPBF and LT1117CST-2.85#PBF from Analog Devices are functionally compatible alternatives. Both maintain the 2.85V output and 800mA current rating with identical dropout voltage. The LT1117CST-2.85#TRPBF variant in Tape & Reel packaging is preferred for production environments. Note the reduced maximum input voltage (10V versus 15V) and lower PSRR (62dB versus 75dB) for the Texas Instruments REG1117 variants. All substitute parts carry ROHS3 compliance and REACH Unaffected certification.

Frequently Asked Questions (FAQ)

Q: Can REG1117-2.85/2K5 directly replace LM1117MP-2.85/NOPB in existing designs?

A: Yes. Both parts deliver 2.85V at 800mA with identical dropout voltage (1.2V @ 800mA) and package configuration (SOT-223). The extended operating temperature range and Active product status of REG1117-2.85/2K5 make it the preferred direct replacement.

Q: What is the difference between SOT-223-3 and SOT-223-4 packages?

A: SOT-223-3 (LT1117 variants) contains three pins, while SOT-223-4 (REG1117 variants) contains four pins. Both fit the TO-261-4 and TO-261AA case outlines. Pin configuration differences require PCB layout verification before substitution.

Q: Are the Analog Devices LT1117CST variants suitable for applications requiring 15V input?

A: No. LT1117CST-2.85#PBF and LT1117CST-2.85#TRPBF are rated for maximum 10V input, compared to 15V for the original LM1117MP-2.85/NOPB and REG1117 variants. Applications requiring higher input voltage must use Texas Instruments parts.

Q: Does the higher quiescent current of substitute parts affect circuit performance?

A: The substitute parts draw 10mA quiescent current versus 5mA for the original. This difference is negligible in most applications but should be evaluated in battery-powered or ultra-low-power designs.

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

A: REG1117-2.85/2K5 carries Active product status, ensuring continued manufacturing and supply. This part is recommended for new designs and long-term production commitments.

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