LP2985IM5X-1.8 Equivalent & Substitute Parts

Part Overview

The LP2985IM5X-1.8 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 classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement continuity. 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 applications requiring stable 1.8V power delivery from input sources up to 16V.

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

Substitute Part Grouping Explanation

Substitute parts for the LP2985IM5X-1.8 are grouped based on strict electrical and mechanical parameter equivalence. All identified substitutes maintain identical output voltage (1.8V), output current (150mA), input voltage rating (16V maximum), dropout voltage (0.58V @ 150mA), quiescent current (95 µA), PSRR (45dB at 1kHz), and package configuration (SOT-23-5). The substitution logic is based on these core parameters: fixed positive output configuration, single regulator topology, enable control feature, and protection against over-current, over-temperature, and short-circuit conditions. Packaging variants (Tape & Reel, Cut Tape, Digi-Reel) are interchangeable for the same electrical specifications. Product status and RoHS compliance are secondary considerations that may influence procurement strategy but do not affect electrical substitutability.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	PSRR	Package	Product Status	RoHS Status
LP2985IM5X-1.8	Texas Instruments	1.8V	150mA	16V	0.58V @ 150mA	95 µA	45dB (1kHz)	SOT-23-5	Obsolete	Non-compliant
LP2985-18DBVR	Texas Instruments	1.8V	150mA	16V	0.58V @ 150mA	95 µA	45dB (1kHz)	SOT-23-5	Active	ROHS3 Compliant
LP2985-18DBVT	Texas Instruments	1.8V	150mA	16V	0.58V @ 150mA	95 µA	45dB (1kHz)	SOT-23-5	Last Time Buy	ROHS3 Compliant
LP2985A-18DBVJ	Texas Instruments	1.8V	150mA	16V	0.58V @ 150mA	95 µA	45dB (1kHz)	SOT-23-5	Last Time Buy	ROHS3 Compliant
LP2985A-18DBVR	Texas Instruments	1.8V	150mA	16V	0.58V @ 150mA	95 µA	45dB (1kHz)	SOT-23-5	Active	ROHS3 Compliant
LP2985A-18DBVT	Texas Instruments	1.8V	150mA	16V	0.58V @ 150mA	95 µA	45dB (1kHz)	SOT-23-5	Last Time Buy	ROHS3 Compliant
LP2985AIM5-1.8/NOPB	National Semiconductor	1.8V	150mA	16V	0.58V @ 150mA	95 µA	45dB (1kHz)	SOT-23-5	Active	Not specified
LP2985AIM5X-1.8/NOPB	Texas Instruments	1.8V	150mA	16V	0.58V @ 150mA	95 µA	45dB (1kHz)	SOT-23-5	Active	ROHS3 Compliant
LP2985IM5-1.8/NOPB	Texas Instruments	1.8V	150mA	16V	0.58V @ 150mA	95 µA	45dB (1kHz)	SOT-23-5	Active	ROHS3 Compliant
LP2985IM5X-1.8/NOPB	Texas Instruments	1.8V	150mA	16V	0.58V @ 150mA	95 µA	45dB (1kHz)	SOT-23-5	Active	ROHS3 Compliant
LD2985BM18R	STMicroelectronics	1.8V	150mA	16V	0.575V @ 150mA	150 µA	45dB (1kHz)	SOT-23-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

For direct replacement of the obsolete LP2985IM5X-1.8, prioritize active product status parts with ROHS3 compliance. LP2985IM5X-1.8/NOPB from Texas Instruments is the primary equivalent, maintaining identical electrical specifications and active product status with full RoHS3 compliance. LP2985-18DBVR and LP2985A-18DBVR are secondary options with active status and RoHS3 compliance, differing only in packaging format (Tape & Reel with Digi-Reel option). LP2985AIM5X-1.8/NOPB and LP2985IM5-1.8/NOPB are functionally equivalent alternatives with active status. Parts designated as Last Time Buy (LP2985-18DBVT, LP2985A-18DBVJ, LP2985A-18DBVT) remain electrically compatible but have limited procurement windows. The STMicroelectronics LD2985BM18R variant exhibits slightly higher quiescent current (150 µA versus 95 µA) and marginally lower dropout voltage (0.575V versus 0.58V), representing acceptable electrical equivalence with active status and RoHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can LP2985IM5X-1.8/NOPB directly replace the obsolete LP2985IM5X-1.8?

A: Yes. Both parts share identical electrical specifications: 1.8V fixed output, 150mA output current, 16V maximum input, 0.58V dropout voltage, 95 µA quiescent current, and SOT-23-5 packaging. The primary difference is product status (Active versus Obsolete) and RoHS compliance (ROHS3 Compliant versus Non-compliant).

Q: What is the difference between LP2985-18DBVR, LP2985-18DBVT, and LP2985IM5X-1.8/NOPB?

A: These parts are electrically identical with the same output voltage, current, and performance specifications. The differences are packaging format: LP2985-18DBVR uses Tape & Reel packaging, LP2985-18DBVT uses Cut Tape, and LP2985IM5X-1.8/NOPB uses Tape & Reel. Product status varies: LP2985-18DBVR is Active, while LP2985-18DBVT is Last Time Buy.

Q: Is the STMicroelectronics LD2985BM18R a suitable substitute?

A: Yes, with minor parameter variations. The LD2985BM18R maintains 1.8V output, 150mA current, and SOT-23-5 packaging. It has slightly higher quiescent current (150 µA versus 95 µA) and marginally lower dropout voltage (0.575V versus 0.58V). These differences are within acceptable tolerance for most applications requiring 1.8V regulation.

Q: Can I use parts marked as Last Time Buy?

A: Last Time Buy parts (LP2985-18DBVT, LP2985A-18DBVJ, LP2985A-18DBVT) are electrically equivalent and functionally interchangeable. However, procurement availability is limited. These should be used only when Active status alternatives are unavailable or when existing inventory is sufficient for production requirements.

Q: What does the packaging designation mean (TR, CT, Digi-Reel)?

A: TR (Tape & Reel) and CT (Cut Tape) refer to supply format for automated assembly. Digi-Reel is a specific packaging option. All three formats contain electrically identical components; the choice depends on assembly equipment compatibility and order quantity requirements.

Q: Are there any protection feature differences between substitutes?

A: The LP2985 series from Texas Instruments includes over-current, over-temperature, and short-circuit protection. The STMicroelectronics LD2985BM18R includes over-current and over-temperature protection but does not specify short-circuit protection in the provided data. This represents a minor functional difference in protection capability.

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