LP2985-18DBVTG4 Equivalent & Substitute Parts

Part Overview

The LP2985-18DBVTG4 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.8V output at 150mA in SOT-23-5 surface mount packaging. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing production and design requirements. Alternative parts are available in active product status with identical or enhanced electrical characteristics and the same mechanical form factor.

Key Parameters

Parameter	Value
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 (SOT-23-5)
Operating Temperature	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LP2985-18DBVTG4 are categorized into two groups based on electrical and mechanical compatibility:

Manufacturer Recommended Substitutes (Higher Current Output): LP2992AIM5-1.8/NOPB, LP2992IM5-1.8/NOPB, and LP2992IM5X-1.8/NOPB are direct functional upgrades from the LP2992 series. These parts maintain identical input voltage, output voltage, package type, and operating temperature range. The key difference is increased output current capability (250mA vs. 150mA), making them suitable for applications requiring higher current delivery. Dropout voltage increases to 0.85V @ 250mA due to the higher current rating.

Parametric Equivalents (Identical Electrical Specifications): LP2985-18DBVR, LP2985-18DBVT, LP2985A-18DBVJ, LP2985A-18DBVR, LP2985A-18DBVT, and LP2985AIM5-1.8/NOPB are parametric equivalents with identical output current (150mA), dropout voltage (0.58V @ 150mA), and all other electrical specifications. These parts differ only in packaging format (Tape & Reel vs. Cut Tape) and product status (Active vs. Last Time Buy).

Substitution Criteria:

Output voltage: 1.8V (fixed)
Input voltage maximum: 16V
Package type: SOT-23-5 (SC-74A, SOT-753)
Operating temperature: -40°C ~ 125°C
Protection features: Over Current, Over Temperature, Short Circuit
RoHS3 compliance and MSL 1 rating

Parameter Comparison

Part Number	Manufacturer	Output Current	Dropout Voltage (Max)	Quiescent Current	Product Status	Package Type
LP2985-18DBVTG4	Texas Instruments	150mA	0.58V @ 150mA	95 µA	Discontinued	SOT-23-5
LP2992AIM5-1.8/NOPB	Texas Instruments	250mA	0.85V @ 250mA	95 µA	Active	SOT-23-5
LP2992IM5-1.8/NOPB	Texas Instruments	250mA	0.85V @ 250mA	95 µA	Active	SOT-23-5
LP2992IM5X-1.8/NOPB	Texas Instruments	250mA	0.85V @ 250mA	95 µA	Active	SOT-23-5
LP2985-18DBVR	Texas Instruments	150mA	0.58V @ 150mA	95 µA	Active	SOT-23-5
LP2985-18DBVT	Texas Instruments	150mA	0.58V @ 150mA	95 µA	Last Time Buy	SOT-23-5
LP2985A-18DBVJ	Texas Instruments	150mA	0.58V @ 150mA	95 µA	Last Time Buy	SOT-23-5
LP2985A-18DBVR	Texas Instruments	150mA	0.58V @ 150mA	95 µA	Active	SOT-23-5
LP2985A-18DBVT	Texas Instruments	150mA	0.58V @ 150mA	95 µA	Last Time Buy	SOT-23-5
LP2985AIM5-1.8/NOPB	National Semiconductor	150mA	0.58V @ 150mA	95 µA	Active	SOT-23-5
LP2985IM5-1.8/NOPB	Texas Instruments	150mA	0.58V @ 150mA	95 µA	Active	SOT-23-5

Engineering Selection Recommendations

For direct replacement with identical electrical performance, select from the parametric equivalent group: LP2985-18DBVR, LP2985A-18DBVR, or LP2985IM5-1.8/NOPB. These parts maintain 150mA output current and 0.58V dropout voltage specifications. LP2985-18DBVR and LP2985A-18DBVR are in active product status with high inventory availability (80,300 and 1,206 units respectively), ensuring long-term supply continuity.

For applications where increased current capacity is acceptable, the LP2992 series (LP2992AIM5-1.8/NOPB, LP2992IM5-1.8/NOPB, LP2992IM5X-1.8/NOPB) provides 250mA output current in the same SOT-23-5 package. All LP2992 variants are in active product status with substantial inventory levels (1,231 to 2,100 units).

All recommended substitutes maintain ROHS3 compliance, MSL 1 rating, and identical operating temperature range (-40°C ~ 125°C). Packaging format selection (Cut Tape, Tape & Reel, or Digi-Reel) depends on procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can LP2992 series parts directly replace the LP2985-18DBVTG4?

A: Yes, mechanically and functionally. The LP2992 series maintains the same 1.8V output voltage, SOT-23-5 package, and operating temperature range. The primary difference is increased output current (250mA vs. 150mA). Applications drawing less than 150mA will operate identically. Applications requiring higher current benefit from the increased capacity.

Q: What is the difference between LP2985-18DBVR and LP2985A-18DBVR?

A: Both parts are parametric equivalents with identical electrical specifications (150mA output, 0.58V dropout voltage). The difference is packaging format: LP2985-18DBVR is supplied in Tape & Reel format, while LP2985A-18DBVR is supplied in Cut Tape & Digi-Reel format. Selection depends on assembly line requirements.

Q: Why does the LP2992 series have higher dropout voltage?

A: The LP2992 series is rated for 250mA output current. Dropout voltage increases to 0.85V @ 250mA due to the higher current rating. At lower currents (below 150mA), actual dropout voltage will be lower than the maximum specification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original LP2985-18DBVTG4 specifications.

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

A: LP2985-18DBVR (Active status, 80,300 units in stock) and LP2985A-18DBVR (Active status, 1,206 units in stock) are recommended for long-term production. All LP2992 variants are also in active product status with strong inventory levels.

Q: Can I use LP2985AIM5-1.8/NOPB from National Semiconductor as a substitute?

A: Yes. LP2985AIM5-1.8/NOPB is a parametric equivalent with identical electrical specifications and SOT-23-5 package. It is in active product status with 4,300 units available. National Semiconductor is now part of Texas Instruments, ensuring design continuity.

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