LP2985A-28DBVRG4 Equivalent & Substitute Parts

Part Overview

The LP2985A-28DBVRG4 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This device delivers 150mA output current at a fixed 2.8V output voltage in a compact SOT-23-5 surface mount package. The main part is classified as Obsolete, which necessitates identification of active equivalent and substitute components for ongoing production and design requirements. Equivalent parts within the LP2985 family and cross-manufacturer alternatives are available to maintain design continuity and supply chain flexibility.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP2985A-28DBVRG4
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	2.8V
Output Current	150mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.58V @ 150mA
Quiescent Current	95 µA
Package / Case	SC-74A, SOT-753
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the LP2985A-28DBVRG4 is determined by the following critical parameters:

Output voltage fixed at 2.8V
Output current capability of 150mA
Maximum input voltage of 16V
Dropout voltage specification of 0.58V @ 150mA
SOT-23-5 package compatibility
Operating temperature range -40°C to 125°C
Enable control feature
Protection against over current, over temperature, and short circuit conditions

Equivalent parts are grouped into three categories:

Texas Instruments LP2985 Family (Parametric Equivalents): Parts LP2985-28DBVR, LP2985-28DBVT, LP2985A-28DBVR, LP2985A-28DBVT, LP2985AIM5-2.8, LP2985AIM5X-2.8/NOPB, LP2985IM5-2.8/NOPB, and LP2985IM5X-2.8/NOPB share identical electrical specifications and package configuration. These differ only in product status, packaging format (Tape & Reel vs. Cut Tape), and RoHS compliance status.

Manufacturer-Recommended Alternatives: STMicroelectronics LD2985BM28R and Microchip Technology MIC5205-2.8YM5-TR meet the core functional requirements with minor parameter variations in dropout voltage and quiescent current while maintaining SOT-23-5 package compatibility and identical output voltage and current ratings.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage @ 150mA	Quiescent Current	Package	Product Status	RoHS Status
LP2985A-28DBVRG4	Texas Instruments	2.8V	150mA	16V	0.58V	95 µA	SOT-23-5	Obsolete	ROHS3 Compliant
LP2985-28DBVR	Texas Instruments	2.8V	150mA	16V	0.58V	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985-28DBVT	Texas Instruments	2.8V	150mA	16V	0.58V	95 µA	SOT-23-5	Obsolete	ROHS3 Compliant
LP2985A-28DBVR	Texas Instruments	2.8V	150mA	16V	0.58V	95 µA	SOT-23-5	Last Time Buy	ROHS3 Compliant
LP2985A-28DBVT	Texas Instruments	2.8V	150mA	16V	0.58V	95 µA	SOT-23-5	Obsolete	ROHS3 Compliant
LP2985AIM5-2.8	Texas Instruments	2.8V	150mA	16V	0.58V	95 µA	SOT-23-5	Not For New Designs	RoHS non-compliant
LP2985AIM5X-2.8/NOPB	Texas Instruments	2.8V	150mA	16V	0.58V	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985IM5-2.8/NOPB	Texas Instruments	2.8V	150mA	16V	0.58V	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985IM5X-2.8/NOPB	Texas Instruments	2.8V	150mA	16V	0.58V	95 µA	SOT-23-5	Active	ROHS3 Compliant
LD2985BM28R	STMicroelectronics	2.8V	150mA	16V	0.575V	150 µA	SOT-23-5	Active	ROHS3 Compliant
MIC5205-2.8YM5-TR	Microchip Technology	2.8V	150mA	16V	0.35V	150 µA	SOT-23-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

For applications requiring immediate replacement of the obsolete LP2985A-28DBVRG4, the following selection criteria apply:

Primary Recommendation: LP2985-28DBVR (Texas Instruments) is the direct parametric equivalent with Active product status and ROHS3 compliance. This part maintains identical electrical specifications and package configuration with current manufacturing support and availability.

Alternative Active Options: LP2985AIM5X-2.8/NOPB, LP2985IM5-2.8/NOPB, and LP2985IM5X-2.8/NOPB are all Active status parts with ROHS3 compliance and identical core specifications. These represent current production alternatives within the LP2985 family.

Cross-Manufacturer Alternatives: LD2985BM28R (STMicroelectronics) and MIC5205-2.8YM5-TR (Microchip Technology) are Active status parts with ROHS3 compliance. Both maintain the required 2.8V output, 150mA current capability, and SOT-23-5 package. The MIC5205-2.8YM5-TR offers improved dropout voltage performance at 0.35V compared to the original specification of 0.58V.

Avoid for New Designs: LP2985AIM5-2.8 carries "Not For New Designs" status and RoHS non-compliance and should not be selected for new applications.

Frequently Asked Questions (FAQ)

Q: Can LP2985-28DBVR directly replace LP2985A-28DBVRG4 without circuit modifications?

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 configuration. No circuit modifications are required.

Q: What is the difference between LP2985-28DBVR and LP2985A-28DBVR?

A: Both parts are parametrically identical. The primary difference is product status: LP2985-28DBVR is Active, while LP2985A-28DBVR is Last Time Buy. For new designs, LP2985-28DBVR is preferred due to ongoing production support.

Q: Why does MIC5205-2.8YM5-TR have a lower dropout voltage than the original part?

A: MIC5205-2.8YM5-TR is a cross-manufacturer alternative from Microchip Technology with improved performance characteristics. The 0.35V dropout voltage (versus 0.58V) represents an enhancement that reduces power dissipation in the regulator. This part is functionally compatible and maintains all required electrical specifications.

Q: Are all substitute parts available in the same packaging format?

A: All listed substitute parts use SOT-23-5 package configuration. However, packaging format (Tape & Reel vs. Cut Tape) varies by part number. Verify packaging format requirements with your supplier before ordering.

Q: Can I use LP2985AIM5-2.8 as a substitute?

A: LP2985AIM5-2.8 is marked "Not For New Designs" and is RoHS non-compliant. This part should not be selected for new applications. Use Active status alternatives such as LP2985-28DBVR or LP2985IM5-2.8/NOPB instead.

Q: What protection features are included in these regulators?

A: All listed parts include over current, over temperature, and short circuit protection. MIC5205-2.8YM5-TR adds reverse polarity protection. All parts support Enable control functionality.

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