LP2985AIM5-2.8 Equivalent & Substitute Parts

Part Overview

The LP2985AIM5-2.8 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 2.8V output at 150mA in a SOT-23-5 surface mount package. This device is classified as Not For New Designs, indicating it has reached end-of-life status. Finding equivalent and substitute parts is necessary for ongoing production support, maintenance applications, and design transitions to active alternatives that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.8V
Output Current	150mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.58V @ 150mA
Quiescent Current	95 µA
Package	SOT-23-5 (SC-74A)
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature Range	-40°C to 125°C
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the LP2985AIM5-2.8 is determined by the following critical parameters:

Fixed output voltage of 2.8V
Minimum output current capability of 150mA
Maximum input voltage of 16V or greater
SOT-23-5 package compatibility
Enable control feature
Operating temperature range of -40°C to 125°C

Substitute parts are grouped into two categories:

Parametric Equivalents (Texas Instruments LP2985 Series): Parts that maintain identical electrical specifications and package form factor. These include LP2985-28DBVR, LP2985-28DBVT, LP2985A-28DBVR, LP2985A-28DBVT, LP2985AIM5X-2.8/NOPB, and LP2985IM5-2.8/NOPB. All share the same output voltage, current rating, dropout voltage, quiescent current, and protection features.

Manufacturer-Recommended Alternatives: Parts from other manufacturers that meet the core electrical requirements with minor parameter variations. LD2985BM28R (STMicroelectronics) provides equivalent functionality with slightly higher quiescent current (150 µA vs. 95 µA). LT1761ES5-2.8#TRPBF and LT1761ES5-2.8#TRMPBF (Analog Devices) offer reduced output current (100mA vs. 150mA) but improved dropout voltage (0.45V vs. 0.58V) and higher input voltage rating (20V vs. 16V).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage @ Rated Current	Quiescent Current	Package	Product Status	RoHS Status
LP2985AIM5-2.8	Texas Instruments	2.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Not For New Designs	RoHS Non-Compliant
LP2985-28DBVR	Texas Instruments	2.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985-28DBVT	Texas Instruments	2.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Obsolete	ROHS3 Compliant
LP2985A-28DBVR	Texas Instruments	2.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Last Time Buy	ROHS3 Compliant
LP2985A-28DBVT	Texas Instruments	2.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Obsolete	ROHS3 Compliant
LP2985AIM5X-2.8/NOPB	Texas Instruments	2.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985IM5-2.8/NOPB	Texas Instruments	2.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985IM5X-2.8/NOPB	Texas Instruments	2.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LD2985BM28R	STMicroelectronics	2.8V	150mA	16V	0.575V @ 150mA	150 µA	SOT-23-5	Active	ROHS3 Compliant
LT1761ES5-2.8#TRPBF	Analog Devices Inc.	2.8V	100mA	20V	0.45V @ 100mA	Not Specified	TSOT-23-5	Active	ROHS3 Compliant
LT1761ES5-2.8#TRMPBF	Analog Devices Inc.	2.8V	100mA	20V	0.45V @ 100mA	Not Specified	TSOT-23-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

LP2985-28DBVR and LP2985IM5-2.8/NOPB are the primary recommended substitutes. Both are Active status parts with ROHS3 compliance, identical electrical parameters, and SOT-23-5 packaging. LP2985-28DBVR offers the highest inventory availability (29,300 units) and is suitable for new production runs. LP2985IM5-2.8/NOPB provides an alternative with active status and adequate stock (3,400 units).

For Legacy Support (Existing Designs):

LP2985A-28DBVR (Last Time Buy status) and LP2985A-28DBVT (Obsolete status) maintain full electrical equivalence but have limited availability windows. These are appropriate only for sustaining production of existing designs where component qualification has already been completed.

For New Designs with Enhanced Performance:

LD2985BM28R (STMicroelectronics) is an active alternative with identical output current and voltage specifications. The slightly elevated quiescent current (150 µA vs. 95 µA) is negligible in most applications and is offset by active product status and ROHS3 compliance.

LT1761ES5-2.8#TRPBF and LT1761ES5-2.8#TRMPBF (Analog Devices) are suitable only for applications where output current requirements do not exceed 100mA. These parts offer superior dropout voltage performance (0.45V vs. 0.58V) and higher maximum input voltage (20V vs. 16V), making them advantageous for low-power designs with tighter supply margins.

Frequently Asked Questions (FAQ)

Q: Can LP2985-28DBVR be used as a direct drop-in replacement for LP2985AIM5-2.8?

A: Yes. LP2985-28DBVR is a parametric equivalent with identical output voltage (2.8V), output current (150mA), dropout voltage (0.58V @ 150mA), quiescent current (95 µA), and SOT-23-5 package. The only differences are product status (Active vs. Not For New Designs) and RoHS compliance (ROHS3 vs. Non-Compliant), both favoring the substitute.

Q: What is the difference between LP2985IM5-2.8/NOPB and LP2985AIM5X-2.8/NOPB?

A: Both parts are parametrically identical with 2.8V output, 150mA current, and SOT-23-5 packaging. The primary distinction is inventory availability (3,400 units vs. 2,200 units) and internal die revision. Both are Active status with ROHS3 compliance and are suitable for new designs.

Q: Can LT1761ES5-2.8#TRPBF replace LP2985AIM5-2.8 in all applications?

A: No. While LT1761ES5-2.8#TRPBF maintains the 2.8V output voltage and SOT-23-5 package form factor, its maximum output current is limited to 100mA compared to the LP2985AIM5-2.8's 150mA rating. This substitute is suitable only for applications drawing 100mA or less. The LT1761 offers improved dropout voltage (0.45V vs. 0.58V) and higher input voltage tolerance (20V vs. 16V), making it preferable for low-current, low-dropout applications.

Q: What is the significance of the packaging designation differences (SOT-23-5 vs. TSOT-23-5)?

A: SOT-23-5 and TSOT-23-5 are both 5-pin surface mount packages with identical pin pitch and footprint compatibility. TSOT-23-5 denotes a thin variant used by Analog Devices. Both are mechanically compatible with standard SOT-23-5 PCB layouts.

Q: Why is LD2985BM28R from STMicroelectronics recommended despite higher quiescent current?

A: LD2985BM28R maintains full electrical equivalence (2.8V output, 150mA current, 0.575V dropout) with Active product status and ROHS3 compliance. The quiescent current increase from 95 µA to 150 µA represents a 55 µA difference, which is negligible in most applications and is offset by the part's active lifecycle status and availability (5,728 units in stock).

Q: Are there any compatibility concerns when switching between Texas Instruments LP2985 variants?

A: No. All LP2985 variants (LP2985-28DBVR, LP2985-28DBVT, LP2985A-28DBVR, LP2985A-28DBVT, LP2985AIM5X-2.8/NOPB, LP2985IM5-2.8/NOPB, LP2985IM5X-2.8/NOPB) share identical electrical specifications, pin configurations, and SOT-23-5 packaging. Substitution between these parts is transparent from a circuit design perspective.

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