LP2985AIM5-2.0 Equivalent & Substitute Parts

Part Overview

The LP2985AIM5-2.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This device delivers 150mA output current with a fixed 2V output and operates across a -40°C to 125°C temperature range. The part is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	2V
Voltage - Input (Max)	16V
Current - Output	150mA
Voltage Dropout (Max)	0.58V @ 150mA
Current - Quiescent (Iq)	95 µA
Operating Temperature	-40°C ~ 125°C
Package / Case	SC-74A, SOT-753
Mounting Type	Surface Mount
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitute parts for the LP2985AIM5-2.0 are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents (Texas Instruments LP2985 Series): These parts maintain identical electrical specifications: 2V fixed output, 150mA output current, 0.58V dropout at 150mA, 95 µA quiescent current, and SOT-23-5 package. Differences exist only in product status, packaging format (Cut Tape, Tape & Reel, or Bulk), and RoHS compliance status. These parts are direct functional replacements with no circuit redesign required.

Manufacturer Recommended Alternatives (Analog Devices LT1761 Series): The LT1761ES5-2#TRMPBF and LT1761ES5-2#TRPBF from Analog Devices Inc. provide functional substitution with the following allowed parameter variations: 100mA output current (versus 150mA), 0.45V dropout at 100mA (versus 0.58V at 150mA), 20V maximum input voltage (versus 16V), and 65dB PSRR at 120Hz (versus 45dB at 1kHz). Both maintain 2V fixed output, SOT-23-5 package compatibility, Enable control feature, and -40°C to 125°C operating range. These alternatives are suitable for applications where the reduced output current and improved dropout characteristics are acceptable.

Parameter Comparison

Parameter	LP2985AIM5-2.0	LP2985AIM5-2.0/NOPB	LP2985AIM5X-2.0/NOPB	LP2985IM5-2.0/NOPB	LP2985IM5X-2.0/NOPB	LT1761ES5-2#TRMPBF	LT1761ES5-2#TRPBF
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	National Semiconductor	Analog Devices Inc.	Analog Devices Inc.
Voltage - Output (Min/Fixed)	2V	2V	2V	2V	2V	2V	2V
Voltage - Input (Max)	16V	16V	16V	16V	16V	20V	20V
Current - Output	150mA	150mA	150mA	150mA	150mA	100mA	100mA
Voltage Dropout (Max)	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA	0.45V @ 100mA	0.45V @ 100mA
Current - Quiescent (Iq)	95 µA	95 µA	95 µA	95 µA	95 µA	Not specified	Not specified
PSRR	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	65dB (120Hz)	65dB (120Hz)
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SOT-23-5 Thin, TSOT-23-5	SOT-23-5 Thin, TSOT-23-5
Control Features	Enable	Enable	Enable	Enable	Enable	Enable	Enable
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Reverse Polarity	Over Current, Over Temperature, Reverse Polarity
Product Status	Obsolete	Obsolete	Last Time Buy	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance): Select LP2985IM5-2.0/NOPB as the primary choice. This part maintains all electrical specifications of the original LP2985AIM5-2.0 while offering Active product status, ROHS3 compliance, and established supply availability. The /NOPB suffix indicates lead-free construction and RoHS compliance, meeting modern manufacturing standards.

For Active Product Status with Improved Compliance: LP2985IM5X-2.0/NOPB provides identical electrical performance with Tape & Reel packaging and ROHS3 compliance. This variant is suitable for high-volume production requiring standardized packaging formats.

For Alternative Topology (Reduced Output Current Requirement): LT1761ES5-2#TRMPBF or LT1761ES5-2#TRPBF from Analog Devices Inc. are suitable when application load current does not exceed 100mA. These alternatives offer improved dropout voltage (0.45V versus 0.58V), higher input voltage tolerance (20V versus 16V), and superior PSRR performance (65dB versus 45dB). Both maintain Active product status and ROHS3 compliance. Selection between #TRMPBF and #TRPBF variants depends on packaging requirements; both are electrically identical.

Avoid: LP2985AIM5-2.0 (Obsolete status) and LP2985AIM5X-2.0/NOPB (Last Time Buy status) should not be selected for new designs due to limited future availability.

Frequently Asked Questions (FAQ)

Q: Can LP2985IM5-2.0/NOPB be used as a direct replacement for LP2985AIM5-2.0? A: Yes. Both parts share identical electrical specifications: 2V fixed output, 150mA output current, 0.58V dropout at 150mA, 95 µA quiescent current, and SOT-23-5 package. The primary difference is product status (Active versus Obsolete) and RoHS compliance (ROHS3 Compliant versus non-compliant). No circuit modifications are required.

Q: What is the difference between LP2985IM5-2.0/NOPB and LP2985IM5X-2.0/NOPB? A: Both parts are electrically identical with identical specifications. The difference is packaging format: LP2985IM5-2.0/NOPB is supplied in Tape & Reel format, while LP2985IM5X-2.0/NOPB is also supplied in Tape & Reel. Both are ROHS3 compliant and Active status. Selection depends on procurement and assembly requirements.

Q: Can LT1761ES5-2#TRMPBF replace LP2985AIM5-2.0 in all applications? A: LT1761ES5-2#TRMPBF is functionally compatible only for applications where output current does not exceed 100mA. The LT1761 series provides 100mA maximum output versus 150mA for the LP2985. If your application requires the full 150mA output current, the LP2985 series must be used. The LT1761 offers advantages in dropout voltage (0.45V versus 0.58V) and input voltage range (20V versus 16V).

Q: Are the LT1761ES5-2#TRMPBF and LT1761ES5-2#TRPBF variants interchangeable? A: Yes. Both variants are electrically identical with identical specifications. The difference is packaging designation: #TRMPBF and #TRPBF represent different tape and reel configurations. Selection depends on assembly equipment compatibility and procurement preferences.

Q: What does the /NOPB suffix indicate? A: The /NOPB suffix indicates lead-free (Pb-free) construction and RoHS compliance. This designation is standard for modern components meeting environmental and regulatory requirements.

Q: Is the SOT-23-5 package compatible with TSOT-23-5? A: Both designations refer to the same 5-pin surface mount package with identical pin configuration and footprint. SOT-23-5 and TSOT-23-5 (Thin SOT-23-5) are mechanically compatible for PCB assembly purposes.

Q: Which substitute part should be selected for new designs? A: LP2985IM5-2.0/NOPB is recommended for new designs. This part offers Active product status, ROHS3 compliance, established supply chain, and identical electrical performance to the original LP2985AIM5-2.0.

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