LP2985-18DBVT Equivalent & Substitute Parts

Part Overview

The LP2985-18DBVT is a linear voltage regulator IC from Texas Instruments, delivering a fixed 1.8V output at 150mA in a SOT-23-5 surface mount package. This device is classified as Last Time Buy, indicating discontinued production with limited availability. The regulator features low dropout voltage (0.58V @ 150mA), integrated over-current and over-temperature protection, and operates across the industrial temperature range of -40°C to 125°C. Alternative part selection becomes necessary due to product status constraints and inventory considerations for long-term production requirements.

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)
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts 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. These parts maintain identical output voltage (1.8V), input voltage rating (16V), package (SOT-23-5), protection features, and operating temperature range. The key difference is increased output current capability (250mA vs. 150mA), making them suitable for applications requiring higher current delivery while maintaining all other electrical characteristics.

Parametric Equivalents (Identical Specifications): LP2985-18DBVR, LP2985A-18DBVJ, LP2985A-18DBVR, LP2985A-18DBVT, LP2985AIM5-1.8/NOPB, LP2985AIM5X-1.8/NOPB, and LP2985IM5-1.8/NOPB are full parametric equivalents with identical output current (150mA), dropout voltage, quiescent current, and all protection features. These parts differ only in packaging format (Cut Tape vs. Tape & Reel) and product status (Active vs. Last Time Buy).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Package	Product Status	Inventory
LP2985-18DBVT	Texas Instruments	1.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Last Time Buy	1821 Pcs
LP2992AIM5-1.8/NOPB	Texas Instruments	1.8V	250mA	16V	0.85V @ 250mA	95 µA	SOT-23-5	Active	1231 Pcs
LP2992IM5-1.8/NOPB	Texas Instruments	1.8V	250mA	16V	0.85V @ 250mA	95 µA	SOT-23-5	Active	2100 Pcs
LP2992IM5X-1.8/NOPB	Texas Instruments	1.8V	250mA	16V	0.85V @ 250mA	95 µA	SOT-23-5	Active	1473 Pcs
LP2985-18DBVR	Texas Instruments	1.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	80300 Pcs
LP2985A-18DBVJ	Texas Instruments	1.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Last Time Buy	21407 Pcs
LP2985A-18DBVR	Texas Instruments	1.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	1206 Pcs
LP2985A-18DBVT	Texas Instruments	1.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Last Time Buy	4428 Pcs
LP2985AIM5-1.8/NOPB	National Semiconductor	1.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	4300 Pcs
LP2985AIM5X-1.8/NOPB	Texas Instruments	1.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	1279 Pcs
LP2985IM5-1.8/NOPB	Texas Instruments	1.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	4100 Pcs

Engineering Selection Recommendations

For direct replacement with identical electrical performance, select from the parametric equivalent group: LP2985-18DBVR, LP2985A-18DBVR, LP2985AIM5X-1.8/NOPB, or LP2985IM5-1.8/NOPB. These parts maintain 150mA output current and 0.58V dropout voltage specifications. Among these, LP2985-18DBVR offers the highest inventory (80300 Pcs) and Active product status, making it the preferred choice for long-term production continuity.

For applications where output current headroom is beneficial, the LP2992 series (LP2992IM5-1.8/NOPB recommended for highest inventory at 2100 Pcs) provides 250mA capability while maintaining identical output voltage, input rating, and protection features. The increased dropout voltage (0.85V @ 250mA) must be evaluated against circuit design margins.

All recommended substitutes are ROHS3 compliant, operate across -40°C to 125°C, and feature identical protection mechanisms (over-current, over-temperature, short-circuit). Packaging format selection (Cut Tape vs. Tape & Reel) depends on procurement and assembly requirements.

Frequently Asked Questions (FAQ)

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

A: LP2992 parts are electrically compatible for applications where 250mA output current is acceptable. The increased dropout voltage (0.85V vs. 0.58V) requires verification that circuit input voltage margins remain adequate. All other parameters—output voltage, input rating, protection features, and package—are identical.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Both formats contain identical die and electrical performance. Cut Tape is supplied in individual strips suitable for manual assembly or small-volume production. Tape & Reel format is optimized for automated pick-and-place assembly in high-volume manufacturing. Selection depends on assembly process requirements.

Q: Why are some parts marked Last Time Buy?

A: Last Time Buy status indicates the manufacturer has discontinued production. Existing inventory remains available but will not be replenished. For long-term production requirements, select parts with Active status such as LP2985-18DBVR or LP2992IM5-1.8/NOPB.

Q: Are all substitute parts ROHS3 compliant?

A: All parts listed in this reference maintain ROHS3 compliance and are suitable for applications requiring RoHS certification.

Q: What is the significance of the IM5 and IM5X designations?

A: These designations indicate the specific die revision and manufacturing process node. Parts with identical electrical specifications (voltage, current, dropout) are functionally interchangeable regardless of revision designation.

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