LP2985A-18DBVT Equivalent & Substitute Parts

Part Overview

The LP2985A-18DBVT 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 in a surface-mount SOT-23-5 package. The part is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring this voltage regulation specification.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Output Voltage (Fixed)	1.8V
Output Current	150mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.58V @ 150mA
Quiescent Current	95 µA
Package Type	SOT-23-5 (SC-74A)
Operating Temperature Range	-40°C to 125°C
Control Features	Enable
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 LP2985A-18DBVT are categorized based on strict electrical and mechanical parameter matching:

Substitution Criteria:

Fixed output voltage of 1.8V
Output current capability of 150mA or greater
Maximum input voltage of 16V or greater
SOT-23-5 package compatibility
Operating temperature range of -40°C to 125°C or wider
Enable control feature
Over current, over temperature, and short circuit protection

Grouping Logic:

Direct Parametric Equivalents (150mA Output): Parts with identical electrical specifications and packaging, differing only in packaging format (Cut Tape vs. Tape & Reel) or product status.
Manufacturer Recommended Substitutes (150mA Output): Active production alternatives from Texas Instruments with identical electrical performance and packaging.
Higher Current Alternatives (250mA Output): LP2992 series parts that exceed the 150mA requirement while maintaining all other electrical and mechanical parameters, suitable for designs with increased current headroom.
Parametric Equivalents with Different Packaging: Parts sharing identical electrical specifications but available in alternative packaging formats to accommodate supply chain flexibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Current	Dropout Voltage (Max)	Packaging Format	Inventory (Pcs)
LP2985A-18DBVT	Texas Instruments	Last Time Buy	150mA	0.58V @ 150mA	Cut Tape (CT)	4428
LP2985IM5-1.8/NOPB	Texas Instruments	Active	150mA	0.58V @ 150mA	Cut Tape (CT) & Digi-Reel®	4100
LP2985IM5X-1.8/NOPB	Texas Instruments	Active	150mA	0.58V @ 150mA	Tape & Reel (TR)	8230
LP2992AIM5-1.8/NOPB	Texas Instruments	Active	250mA	0.85V @ 250mA	Cut Tape (CT) & Digi-Reel®	1231
LP2992IM5-1.8/NOPB	Texas Instruments	Active	250mA	0.85V @ 250mA	Tape & Reel (TR)	2100
LP2992IM5X-1.8/NOPB	Texas Instruments	Active	250mA	0.85V @ 250mA	Cut Tape (CT) & Digi-Reel®	1473
LP2985-18DBVR	Texas Instruments	Active	150mA	0.58V @ 150mA	Tape & Reel (TR)	80300
LP2985-18DBVT	Texas Instruments	Last Time Buy	150mA	0.58V @ 150mA	Cut Tape (CT)	1821
LP2985A-18DBVJ	Texas Instruments	Last Time Buy	150mA	0.58V @ 150mA	Cut Tape (CT)	21407
LP2985A-18DBVR	Texas Instruments	Active	150mA	0.58V @ 150mA	Cut Tape (CT) & Digi-Reel®	1206
LP2985AIM5-1.8/NOPB	National Semiconductor	Active	150mA	0.58V @ 150mA	SOT-23-5	4300

Engineering Selection Recommendations

For Immediate Replacement (Active Production):

Select LP2985A-18DBVR or LP2985IM5-1.8/NOPB for direct substitution. Both parts maintain identical electrical specifications and packaging. LP2985-18DBVR offers the highest inventory availability (80,300 pcs) in Tape & Reel format, suitable for high-volume production. LP2985IM5-1.8/NOPB provides flexibility with dual packaging options (Cut Tape and Digi-Reel).

For Designs Requiring Higher Current Margin:

The LP2992 series (LP2992AIM5-1.8/NOPB, LP2992IM5-1.8/NOPB, LP2992IM5X-1.8/NOPB) delivers 250mA output current while maintaining the same 1.8V output voltage, SOT-23-5 package, and protection features. The increased dropout voltage (0.85V @ 250mA vs. 0.58V @ 150mA) must be evaluated against application power budget requirements.

Compliance Considerations:

All recommended substitutes maintain ROHS3 compliance, MSL Level 1 rating, and identical protection features (over current, over temperature, short circuit). No additional qualification is required from a regulatory standpoint.

Packaging Format Selection:

Cut Tape (CT) format: Suitable for low-to-medium volume assembly and prototyping
Tape & Reel (TR) format: Optimized for automated high-volume production
Digi-Reel® format: Provides flexibility for both manual and automated assembly

Frequently Asked Questions (FAQ)

Q: Can LP2985A-18DBVT be directly replaced with LP2985IM5-1.8/NOPB?

A: Yes. Both parts deliver identical electrical performance: 1.8V fixed output, 150mA current, 0.58V maximum dropout voltage, and SOT-23-5 packaging. The difference is packaging format (Cut Tape vs. Cut Tape & Digi-Reel) and product status (Last Time Buy vs. Active). LP2985IM5-1.8/NOPB is the recommended active production alternative.

Q: What is the difference between LP2985 and LP2992 series?

A: The LP2992 series provides higher output current (250mA vs. 150mA) with a slightly higher dropout voltage (0.85V vs. 0.58V at rated current). Both maintain the same 1.8V output voltage, SOT-23-5 package, and protection features. Use LP2992 when designs require additional current headroom or when supply of LP2985 parts is constrained.

Q: Are all substitutes compatible with existing PCB layouts?

A: Yes. All listed substitutes use the SOT-23-5 (SC-74A) package with identical pin configuration and footprint. No PCB redesign is required for mechanical compatibility.

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

A: Last Time Buy status indicates Texas Instruments has discontinued production of this specific part number variant. Active alternatives with identical specifications are available (LP2985A-18DBVR, LP2985IM5-1.8/NOPB) to ensure design continuity.

Q: Which substitute offers the best inventory availability?

A: LP2985-18DBVR provides the highest inventory level at 80,300 pcs in Tape & Reel format, making it the optimal choice for high-volume production requirements.

Q: Do all substitutes maintain the same protection features?

A: Yes. All listed substitutes include over current, over temperature, and short circuit protection. Enable control functionality is present across all alternatives.

Q: What packaging format should be selected for automated assembly?

A: Tape & Reel (TR) format is standard for automated pick-and-place assembly. LP2985-18DBVR and LP2985IM5X-1.8/NOPB are available in TR format with high inventory levels.

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