LP2985A-18DBVJ Equivalent & Substitute Parts

Part Overview

The LP2985A-18DBVJ is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed 1.8V output at 150mA with low dropout characteristics, housed in a SOT-23-5 surface mount package. The part is designated as Last Time Buy status, indicating limited future availability. Identifying equivalent and substitute parts ensures design continuity and supply chain resilience for applications requiring 1.8V regulation in space-constrained environments.

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
Package	SOT-23-5 (SC-74A)
Operating Temperature	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LP2985A-18DBVJ are grouped into two categories based on electrical and mechanical compatibility:

Parametric Equivalents (Direct Substitutes): Parts sharing identical electrical specifications—1.8V fixed output, 150mA output current, 0.58V maximum dropout at 150mA, 95 µA quiescent current, SOT-23-5 package, and -40°C to 125°C operating range. These parts differ only in packaging format (Cut Tape vs. Tape & Reel) or minor manufacturing variants. Parametric equivalents include LP2985-18DBVR, LP2985-18DBVT, LP2985A-18DBVR, LP2985A-18DBVT, LP2985AIM5-1.8/NOPB, LP2985AIM5X-1.8/NOPB, and LP2985IM5-1.8/NOPB.

Manufacturer Recommended Alternatives: Parts that maintain the same output voltage (1.8V), package (SOT-23-5), and operating temperature range but may differ in output current capability, quiescent current, or dropout voltage. These include LD2985BM18R (STMicroelectronics) and SPX3819M5-L-1-8/TR (MaxLinear). The SPX3819M5-L-1-8/TR offers higher output current (500mA) and lower quiescent current (8 µA), suitable for applications requiring greater current delivery or lower standby power consumption.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Dropout (Max)	Iq (µA)	Package	Status	Inventory
LP2985A-18DBVJ	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95	SOT-23-5	Last Time Buy	21,407
LP2985-18DBVR	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95	SOT-23-5	Active	80,300
LP2985-18DBVT	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95	SOT-23-5	Last Time Buy	1,821
LP2985A-18DBVR	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95	SOT-23-5	Active	1,206
LP2985A-18DBVT	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95	SOT-23-5	Last Time Buy	4,428
LP2985AIM5-1.8/NOPB	National Semiconductor	1.8V	150mA	0.58V @ 150mA	95	SOT-23-5	Active	4,300
LP2985AIM5X-1.8/NOPB	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95	SOT-23-5	Active	1,279
LP2985IM5-1.8/NOPB	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95	SOT-23-5	Active	4,100
LP2985IM5X-1.8/NOPB	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95	SOT-23-5	Active	8,230
LD2985BM18R	STMicroelectronics	1.8V	150mA	0.575V @ 150mA	150	SOT-23-5	Active	17,747
SPX3819M5-L-1-8/TR	MaxLinear, Inc.	1.8V	500mA	Not specified	8	SOT-23-5	Active	605,400

Engineering Selection Recommendations

For direct replacement of LP2985A-18DBVJ in active production designs, select from Texas Instruments Active status parts: LP2985-18DBVR (Tape & Reel packaging, 80,300 units available) or LP2985IM5X-1.8/NOPB (Tape & Reel packaging, 8,230 units available). Both maintain identical electrical specifications and SOT-23-5 package compatibility.

For designs requiring extended supply availability, LP2985AIM5-1.8/NOPB (National Semiconductor, 4,300 units) provides parametric equivalence with Active product status.

When higher output current capacity is acceptable, SPX3819M5-L-1-8/TR (MaxLinear) delivers 500mA output current with significantly lower quiescent current (8 µA vs. 95 µA), beneficial for battery-powered applications. This part maintains 1.8V output and SOT-23-5 packaging but requires verification of dropout voltage performance in your specific application circuit.

LD2985BM18R (STMicroelectronics) offers an alternative from a different manufacturer with 17,747 units in stock. Note the slightly higher quiescent current (150 µA) and marginally lower dropout voltage (0.575V).

All recommended substitutes carry ROHS3 compliance and operate across the -40°C to 125°C temperature range.

Frequently Asked Questions (FAQ)

Q: Can LP2985-18DBVR directly replace LP2985A-18DBVJ?

A: Yes. Both parts deliver 1.8V fixed output at 150mA with 0.58V maximum dropout, 95 µA quiescent current, and SOT-23-5 packaging. The primary difference is packaging format: LP2985-18DBVR is supplied in Tape & Reel format while LP2985A-18DBVJ is Cut Tape. Electrical performance is identical.

Q: What is the difference between LP2985AIM5-1.8/NOPB and LP2985IM5-1.8/NOPB?

A: Both parts are electrically identical with 1.8V output, 150mA current, and SOT-23-5 packaging. The "A" variant designation indicates a manufacturing revision. Both are Active status parts suitable for new designs.

Q: Can SPX3819M5-L-1-8/TR be used as a drop-in replacement?

A: SPX3819M5-L-1-8/TR maintains 1.8V output and SOT-23-5 packaging but differs in output current (500mA vs. 150mA) and quiescent current (8 µA vs. 95 µA). It is suitable for applications where higher current delivery or lower standby power is beneficial. Verify dropout voltage performance and enable pin functionality in your circuit topology before substitution.

Q: Why is LP2985A-18DBVJ marked as Last Time Buy?

A: Last Time Buy status indicates the manufacturer has discontinued this specific part number variant. Existing inventory (21,407 units) represents the final production run. For new designs or long-term production, transition to Active status equivalents such as LP2985-18DBVR or LP2985IM5X-1.8/NOPB.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, meeting environmental and hazardous substance restrictions for commercial and industrial applications.

Q: What packaging formats are available for LP2985 1.8V regulators?

A: Available formats include Cut Tape (CT), Tape & Reel (TR), and Cut Tape & Digi-Reel combinations. Select based on your procurement and assembly requirements. Electrical specifications remain constant across packaging variants.

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