LP2985-18DBVRG4 Equivalent & Substitute Parts

Part Overview

The LP2985-18DBVRG4 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.8V output applications. This Surface Mount device in SOT-23-5 package delivers 150mA output current with integrated protection features including over-current, over-temperature, and short-circuit protection. The part is classified as Last Time Buy, indicating end-of-life status. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications currently using this regulator.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP2985-18DBVRG4
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	1.8V
Output Current	150mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.58V @ 150mA
Quiescent Current	95 µA
Package / Case	SC-74A, SOT-753
Supplier Device Package	SOT-23-5
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution for the LP2985-18DBVRG4 is determined by the following critical parameters:

Direct Parametric Equivalents maintain identical electrical specifications: 1.8V fixed output, 150mA output current, 0.58V maximum dropout voltage at 150mA, 95 µA quiescent current, SOT-23-5 package, and -40°C to 125°C operating temperature range. These parts differ only in packaging format (Tape & Reel vs. Cut Tape) or minor device designations within the LP2985 base product family.

Functional Upgrades provide higher output current capability (250mA) while maintaining all other electrical parameters including 1.8V output, SOT-23-5 package, and identical protection features. These parts from the LP2992 series are suitable for applications requiring additional current headroom without circuit redesign.

Active vs. Last Time Buy Status distinguishes between parts with ongoing production (Active) and those approaching end-of-life (Last Time Buy). Active parts ensure long-term availability for new designs and production continuity.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Dropout Voltage @ Rated Current	Quiescent Current	Package	Product Status	Packaging Format
LP2985-18DBVRG4	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Last Time Buy	Tape & Reel
LP2985AIM5X-1.8/NOPB	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Active	Cut Tape & Digi-Reel
LP2985IM5-1.8/NOPB	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Active	Cut Tape & Digi-Reel
LP2992AIM5-1.8/NOPB	Texas Instruments	1.8V	250mA	0.85V @ 250mA	95 µA	SOT-23-5	Active	Cut Tape & Digi-Reel
LP2992IM5-1.8/NOPB	Texas Instruments	1.8V	250mA	0.85V @ 250mA	95 µA	SOT-23-5	Active	Tape & Reel
LP2992IM5X-1.8/NOPB	Texas Instruments	1.8V	250mA	0.85V @ 250mA	95 µA	SOT-23-5	Active	Cut Tape & Digi-Reel
LP2985-18DBVR	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Active	Tape & Reel
LP2985-18DBVT	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Last Time Buy	Cut Tape
LP2985A-18DBVJ	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Last Time Buy	Cut Tape
LP2985A-18DBVR	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Active	Cut Tape & Digi-Reel
LP2985A-18DBVT	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Last Time Buy	Cut Tape

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select LP2985-18DBVR, LP2985AIM5X-1.8/NOPB, or LP2985IM5-1.8/NOPB. These parts maintain 150mA output current and 0.58V dropout voltage specifications. LP2985-18DBVR and LP2985IM5-1.8/NOPB carry Active product status, ensuring continued availability and production support. Packaging format selection depends on assembly requirements: Tape & Reel for high-volume production or Cut Tape & Digi-Reel for lower-volume applications.

For Applications Requiring Higher Current Capability: Select LP2992IM5-1.8/NOPB, LP2992AIM5-1.8/NOPB, or LP2992IM5X-1.8/NOPB. These parts provide 250mA output current while maintaining 1.8V output voltage and SOT-23-5 package compatibility. All three carry Active product status. The increased dropout voltage (0.85V @ 250mA) must be verified against circuit power budget requirements.

For Supply Chain Continuity: Prioritize parts with Active product status to avoid future obsolescence. LP2985-18DBVR, LP2985AIM5X-1.8/NOPB, LP2985IM5-1.8/NOPB, LP2985A-18DBVR, LP2992IM5-1.8/NOPB, LP2992AIM5-1.8/NOPB, and LP2992IM5X-1.8/NOPB all carry Active designation.

Compliance Verification: All listed parts maintain ROHS3 compliance and REACH Unaffected status, matching the original part's regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can LP2992 series parts directly replace LP2985-18DBVRG4 in existing designs?

A: LP2992 series parts are functionally compatible in applications where the circuit can tolerate the higher dropout voltage (0.85V @ 250mA vs. 0.58V @ 150mA). The increased output current capability (250mA vs. 150mA) does not require circuit modification. Verify that the higher dropout voltage does not compromise minimum input voltage requirements for your application.

Q: What is the difference between Tape & Reel and Cut Tape & Digi-Reel packaging?

A: Tape & Reel packaging is standard for high-volume automated assembly lines. Cut Tape & Digi-Reel packaging provides flexibility for lower-volume production or mixed-component orders. Both formats contain identical components; the difference is in delivery and handling format only.

Q: Why are some parts marked Last Time Buy?

A: Last Time Buy designation indicates the manufacturer is discontinuing production. Parts with this status have limited remaining inventory. For new designs or long-term production, select parts with Active product status to ensure ongoing availability.

Q: Are all substitute parts pin-compatible with LP2985-18DBVRG4?

A: Yes. All listed substitute parts use the SOT-23-5 package (SC-74A, SOT-753), maintaining identical pinout and PCB footprint compatibility. No circuit board redesign is required for substitution.

Q: What parameters must remain identical for a direct substitution?

A: For direct substitution without circuit modification, the following parameters must match: output voltage (1.8V), output current rating (150mA for LP2985 series), SOT-23-5 package, and operating temperature range (-40°C to 125°C). Packaging format (Tape & Reel vs. Cut Tape) does not affect electrical compatibility.

Q: Can I use LP2992 parts in applications designed for 150mA maximum current?

A: Yes. LP2992 parts rated for 250mA output current are suitable for applications requiring 150mA or less. The higher current rating provides design margin without affecting circuit operation. Verify dropout voltage compatibility as noted above.

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