LP2981-28DBVR Equivalent & Substitute Parts

Part Overview

The LP2981-28DBVR is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) device. It delivers a fixed positive output of 2.8V at 100mA in a surface-mount SOT-23-5 package. The device is currently obsolete, making identification of equivalent and substitute parts essential for ongoing design support, production continuity, and legacy system maintenance.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LP2981-28DBVR
Output Voltage (Fixed)	2.8V
Output Current	100mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.37V @ 100mA
Quiescent Current	95 µA
Package	SOT-23-5 (SC-74A)
Operating Temperature	-40°C to 125°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the LP2981-28DBVR are grouped based on strict electrical and mechanical compatibility criteria:

Parametric Equivalents (Direct Replacements): Parts that maintain identical output voltage (2.8V fixed), output current (100mA), input voltage rating (16V max), dropout voltage (0.37V @ 100mA), quiescent current (95 µA), and package format (SOT-23-5). These parts differ only in packaging configuration (Cut Tape vs. Tape & Reel) or product status.

Manufacturer-Recommended Alternatives: Parts that satisfy the core functional requirements but introduce controlled parameter variations. These are selected when direct parametric equivalents are unavailable or when design flexibility permits.

Key Parameters for Substitution Eligibility:

Output voltage configuration (fixed 2.8V)
Output current capability (minimum 100mA)
Maximum input voltage (16V or higher)
Package type (SOT-23-5)
Operating temperature range (-40°C to 125°C)
Surface-mount mounting type

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Quiescent Current	Package	Product Status	Packaging Type
LP2981-28DBVR	Texas Instruments	2.8V (Fixed)	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Obsolete	Cut Tape & Digi-Reel
LP2981-28DBVT	Texas Instruments	2.8V (Fixed)	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Obsolete	Tape & Reel
LP2981A-28DBVR	Texas Instruments	2.8V (Fixed)	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Last Time Buy	Cut Tape & Digi-Reel
LP2981A-28DBVT	Texas Instruments	2.8V (Fixed)	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active	Tape & Reel
MIC5203-2.8YM5-TR	Microchip Technology	2.8V (Fixed)	80mA	16V	0.6V @ 80mA	750 µA	SOT-23-5	Active	Tape & Reel
TPS7A2401DBVR	Texas Instruments	1.24V to 17.75V (Adjustable)	200mA	18V	0.25V @ 200mA	4.5 µA	SOT-23-5	Active	Cut Tape & Digi-Reel

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance): LP2981A-28DBVT is the preferred choice. It maintains all electrical parameters of the LP2981-28DBVR while offering Active product status, ensuring long-term availability and manufacturing support. This part is functionally identical and requires no design modification.

For Extended Availability: LP2981A-28DBVR provides the same electrical specifications as LP2981A-28DBVT with alternative packaging (Cut Tape & Digi-Reel). Both LP2981A variants are recommended over LP2981-28DBVT due to superior product status (Active vs. Obsolete).

For Alternative Sourcing (Cross-Manufacturer): MIC5203-2.8YM5-TR from Microchip Technology is electrically compatible for applications where output current requirements do not exceed 80mA. This part introduces higher dropout voltage (0.6V vs. 0.37V) and elevated quiescent current (750 µA vs. 95 µA), making it suitable only for designs with relaxed power efficiency requirements.

For Enhanced Performance (Adjustable Output): TPS7A2401DBVR offers superior specifications including higher output current (200mA), lower dropout voltage (0.25V @ 200mA), and significantly lower quiescent current (4.5 µA). However, this part requires external resistor network configuration to set output voltage to 2.8V, introducing design complexity. Use only when enhanced performance justifies additional circuit design effort.

Compliance Considerations: All substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status, matching the original part's regulatory standing.

Frequently Asked Questions (FAQ)

Q: Can LP2981A-28DBVT directly replace LP2981-28DBVR without circuit modification? A: Yes. LP2981A-28DBVT is a parametric equivalent with identical electrical specifications. The only difference is packaging format (Tape & Reel vs. Cut Tape & Digi-Reel). No design changes are required.

Q: What is the difference between LP2981-28DBVR and LP2981A-28DBVR? A: Both parts are electrically identical. The primary distinction is product status: LP2981-28DBVR is Obsolete, while LP2981A-28DBVR is Last Time Buy. For new designs or production continuity, LP2981A-28DBVR is preferred.

Q: Can MIC5203-2.8YM5-TR be used as a drop-in replacement? A: MIC5203-2.8YM5-TR is compatible only for applications where output current does not exceed 80mA. It exhibits higher dropout voltage (0.6V vs. 0.37V) and higher quiescent current (750 µA vs. 95 µA). Verify that your application can tolerate these parameter variations before substitution.

Q: Is TPS7A2401DBVR suitable for direct replacement? A: TPS7A2401DBVR is not a direct replacement. It is an adjustable regulator requiring external resistor configuration to achieve 2.8V output. Use this part only when enhanced performance (higher current, lower dropout) justifies additional circuit design.

Q: What packaging options are available for LP2981A equivalents? A: LP2981A-28DBVT is supplied in Tape & Reel (TR) format. LP2981A-28DBVR is supplied in Cut Tape (CT) & Digi-Reel format. Both are surface-mount SOT-23-5 packages. Select based on your procurement and assembly requirements.

Q: Are all substitute parts RoHS compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the original LP2981-28DBVR specification.

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