LP2985AIM5-1.8 Equivalent & Substitute Parts

Part Overview

The LP2985AIM5-1.8 is a linear voltage regulator IC from Texas Instruments (now part of National Semiconductor product lines) designed for positive fixed 1.8V output at 150mA. This Surface Mount device in SOT-23-5 package provides low-noise, low-dropout regulation with integrated protection features including over-current, over-temperature, and short-circuit protection.

The original part carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Multiple parametrically equivalent alternatives exist with Active or Last Time Buy status from Texas Instruments and STMicroelectronics.

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

Substitution eligibility is determined by strict parameter matching across electrical and mechanical specifications. All substitute parts listed 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), package type (SOT-23-5), operating temperature range (-40°C to 125°C), and protection features (Over Current, Over Temperature, Short Circuit).

Substitute parts are grouped into two categories:

Parametric Equivalents (Texas Instruments): Parts LP2985-18DBVR, LP2985-18DBVT, LP2985A-18DBVJ, LP2985A-18DBVR, LP2985A-18DBVT, LP2985AIM5-1.8/NOPB, LP2985AIM5X-1.8/NOPB, LP2985IM5-1.8/NOPB, and LP2985IM5X-1.8/NOPB share identical electrical performance and mechanical compatibility. Differences exist only in packaging format (Tape & Reel, Cut Tape, or Digi-Reel) and product lifecycle status.

Manufacturer Recommended Alternative (STMicroelectronics): Part LD2985BM18R from STMicroelectronics maintains electrical equivalence with minor parameter variations: quiescent current of 150 µA (versus 95 µA) and maximum supply current of 4 mA (versus 2.5 mA). Dropout voltage is 0.575V @ 150mA, functionally equivalent to the 0.58V specification.

Parameter Comparison

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

Engineering Selection Recommendations

For new designs and ongoing production, selection among substitute parts should prioritize Active product status and RoHS3 compliance. The following parts meet both criteria:

LP2985-18DBVR, LP2985A-18DBVR, LP2985AIM5X-1.8/NOPB, LP2985IM5-1.8/NOPB, LP2985IM5X-1.8/NOPB, and LD2985BM18R are all Active status components with ROHS3 compliance certification.

For applications requiring the lowest quiescent current specification (95 µA), all Texas Instruments LP2985 variants maintain this parameter. The STMicroelectronics LD2985BM18R operates at 150 µA quiescent current, which may impact battery-powered or ultra-low-power applications.

Packaging format selection depends on procurement and assembly requirements. Tape & Reel (TR) packaging suits high-volume automated assembly. Cut Tape (CT) and Digi-Reel options accommodate lower-volume or mixed-component orders.

Parts designated Last Time Buy (LP2985-18DBVT, LP2985A-18DBVJ, LP2985A-18DBVT) remain available but represent end-of-life inventory. These are suitable for legacy system support or existing design continuity where Active alternatives are not required.

Frequently Asked Questions (FAQ)

Q: Can LP2985-18DBVR directly replace LP2985AIM5-1.8 in existing designs?

A: Yes. Both parts maintain identical electrical specifications: 1.8V fixed output, 150mA output current, 0.58V dropout voltage at 150mA, 95 µA quiescent current, and SOT-23-5 package. The primary difference is product status (Active versus Obsolete) and RoHS compliance (ROHS3 Compliant versus Non-compliant). Pin configuration and functional behavior are identical.

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

A: Both parts are electrically identical with matching output voltage, current, dropout voltage, and quiescent current specifications. The suffix designations indicate internal die or manufacturing process variations that do not affect electrical performance or package compatibility. Both are suitable for direct substitution.

Q: Is LD2985BM18R from STMicroelectronics a suitable alternative?

A: LD2985BM18R is functionally equivalent for most applications. It maintains 1.8V output, 150mA current capability, and SOT-23-5 package compatibility. The quiescent current is 150 µA (versus 95 µA in LP2985 variants) and maximum supply current is 4 mA (versus 2.5 mA). For power-sensitive applications, the higher quiescent current may be a consideration. Dropout voltage is 0.575V, functionally equivalent to 0.58V.

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

A: TR (Tape & Reel) is standard for high-volume automated pick-and-place assembly. CT (Cut Tape) provides individual component strips for lower volumes or mixed orders. Digi-Reel is a proprietary format combining tape and reel benefits. All three formats contain identical components; packaging choice depends on assembly process and order quantity.

Q: Are all substitute parts RoHS compliant?

A: Most Texas Instruments variants (LP2985-18DBVR, LP2985A-18DBVR, LP2985A-18DBVT, LP2985AIM5X-1.8/NOPB, LP2985IM5-1.8/NOPB, LP2985IM5X-1.8/NOPB) and STMicroelectronics LD2985BM18R are ROHS3 Compliant. LP2985AIM5-1.8/NOPB from National Semiconductor does not specify RoHS status. The original LP2985AIM5-1.8 is RoHS non-compliant. For applications requiring RoHS certification, select from the ROHS3 Compliant variants.

Q: Can I use Last Time Buy parts for new production?

A: Last Time Buy parts (LP2985-18DBVT, LP2985A-18DBVJ, LP2985A-18DBVT) are available in current inventory but represent end-of-life status. They are suitable for legacy system support or design continuity where existing stock must be consumed. For new production programs, Active status parts (LP2985-18DBVR, LP2985A-18DBVR, LP2985AIM5X-1.8/NOPB, LP2985IM5-1.8/NOPB, LP2985IM5X-1.8/NOPB, LD2985BM18R) provide long-term supply assurance.

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