LP2985A-18DBVRG4 Equivalent & Substitute Parts

Part Overview

The LP2985A-18DBVRG4 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.8V output at 150mA in a SOT-23-5 surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing production and maintenance applications. The device provides low-noise, low-dropout regulation with integrated protection features including over-current, over-temperature, and short-circuit protection, making it suitable for battery-powered and space-constrained applications requiring stable 1.8V rails.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.8V
Output Current	150mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.58V @ 150mA
Quiescent Current	95 µA
PSRR	45dB (1kHz)
Operating Temperature Range	-40°C to 125°C
Package	SOT-23-5 (SC-74A)
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution for the LP2985A-18DBVRG4 is determined by the following critical parameters:

Direct Parametric Equivalents (identical electrical specifications and package):

Output voltage: 1.8V fixed
Output current: 150mA
Input voltage maximum: 16V
Dropout voltage: 0.58V @ 150mA
Package: SOT-23-5
Protection and control features: identical

Higher Current Capability Substitutes (same voltage and package, increased current rating):

Output voltage: 1.8V fixed
Output current: 250mA (higher than original 150mA)
Input voltage maximum: 16V
Dropout voltage: 0.85V @ 250mA (slightly higher)
Package: SOT-23-5
Protection and control features: identical

These substitutes maintain electrical compatibility within the specified parameter ranges while offering enhanced current delivery capability or improved product status (Active vs. Discontinued).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Dropout Voltage	Input Voltage (Max)	Quiescent Current	Package	Product Status	Inventory
LP2985A-18DBVRG4	Texas Instruments	1.8V	150mA	0.58V @ 150mA	16V	95 µA	SOT-23-5	Discontinued	656 Pcs
LP2985IM5-1.8/NOPB	Texas Instruments	1.8V	150mA	0.58V @ 150mA	16V	95 µA	SOT-23-5	Active	4100 Pcs
LP2985-18DBVR	Texas Instruments	1.8V	150mA	0.58V @ 150mA	16V	95 µA	SOT-23-5	Active	80300 Pcs
LP2985A-18DBVJ	Texas Instruments	1.8V	150mA	0.58V @ 150mA	16V	95 µA	SOT-23-5	Last Time Buy	21407 Pcs
LP2985A-18DBVR	Texas Instruments	1.8V	150mA	0.58V @ 150mA	16V	95 µA	SOT-23-5	Active	1206 Pcs
LP2985A-18DBVT	Texas Instruments	1.8V	150mA	0.58V @ 150mA	16V	95 µA	SOT-23-5	Last Time Buy	4428 Pcs
LP2985AIM5-1.8/NOPB	National Semiconductor	1.8V	150mA	0.58V @ 150mA	16V	95 µA	SOT-23-5	Active	4300 Pcs
LP2992AIM5-1.8/NOPB	Texas Instruments	1.8V	250mA	0.85V @ 250mA	16V	95 µA	SOT-23-5	Active	1231 Pcs
LP2992IM5-1.8/NOPB	Texas Instruments	1.8V	250mA	0.85V @ 250mA	16V	95 µA	SOT-23-5	Active	2100 Pcs
LP2992IM5X-1.8/NOPB	Texas Instruments	1.8V	250mA	0.85V @ 250mA	16V	95 µA	SOT-23-5	Active	1473 Pcs

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

LP2985-18DBVR is the primary recommendation. This part maintains identical electrical parameters to the LP2985A-18DBVRG4 with Active product status and the highest available inventory (80,300 pcs), ensuring long-term supply continuity. Both are Texas Instruments products with identical ROHS3 compliance and MSL-1 moisture sensitivity ratings.

LP2985IM5-1.8/NOPB provides an alternative direct equivalent with Active status and substantial inventory (4,100 pcs). This part is suitable for applications requiring the same 150mA output current specification.

LP2985AIM5-1.8/NOPB, manufactured by National Semiconductor (now part of Texas Instruments), offers identical electrical specifications with Active status and 4,300 pcs inventory. This part is compatible for direct substitution.

For Enhanced Current Capability:

LP2992IM5-1.8/NOPB and LP2992AIM5-1.8/NOPB provide 250mA output current in the same SOT-23-5 package. These parts are suitable for applications where the original 150mA specification can accommodate higher current delivery. The increased dropout voltage (0.85V vs. 0.58V) must be evaluated against circuit design margins. Both maintain Active status with ROHS3 compliance.

For Last-Time-Buy Scenarios:

LP2985A-18DBVJ and LP2985A-18DBVT are designated Last Time Buy. These parts maintain identical specifications but have limited future availability. Selection should prioritize Active status parts for new designs.

All recommended substitutes maintain identical operating temperature range (-40°C to 125°C), protection features, and control functionality. Package compatibility (SOT-23-5) is consistent across all options.

Frequently Asked Questions (FAQ)

Q: Can LP2992 series parts directly replace LP2985 series in my application?

A: LP2992 parts are compatible substitutes if your circuit design accommodates the increased output current rating (250mA vs. 150mA) and the slightly higher dropout voltage (0.85V vs. 0.58V at rated current). The 1.8V output voltage, input voltage range, protection features, and package remain identical. Verify that the higher dropout voltage does not violate your minimum input voltage or output voltage regulation requirements.

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

A: Both parts are parametrically equivalent with identical electrical specifications, output voltage, current rating, and package. The primary difference is product status: LP2985-18DBVR is Active with significantly higher inventory (80,300 pcs), while LP2985A-18DBVR is also Active with lower inventory (1,206 pcs). For new designs, LP2985-18DBVR is preferred due to superior supply availability.

Q: Are there packaging differences between substitute parts?

A: All substitute parts use the SOT-23-5 package (SC-74A). Packaging options vary by part number (Cut Tape, Tape & Reel, Digi-Reel), but the physical component package remains identical, ensuring PCB footprint compatibility.

Q: Why is the LP2985A-18DBVRG4 discontinued?

A: The discontinuation reflects normal product lifecycle management. Active alternatives with identical specifications are available from Texas Instruments, ensuring design continuity without functional impact.

Q: Can I use LP2985AIM5-1.8/NOPB from National Semiconductor instead of Texas Instruments parts?

A: Yes. National Semiconductor is now part of Texas Instruments. The LP2985AIM5-1.8/NOPB maintains identical electrical specifications, package, and compliance certifications (ROHS3, MSL-1). This part is suitable for direct substitution.

Q: What compliance certifications apply to all substitute parts?

A: All parts listed maintain ROHS3 compliance, MSL-1 (Unlimited) moisture sensitivity level, and REACH Unaffected status. ECCN classification is EAR99 for all parts. These certifications ensure regulatory compliance across all substitute options.

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