LP2981A-28DBVR Equivalent & Substitute Parts

Part Overview

The LP2981A-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 in Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring 2.8V regulation with 100mA output capacity.

Substiute Parts

LP2981A-28DBVR

Texas InstrumentsIn Stock: 4420LP2981A-28DBVR Datasheet

Current PartRFQ

TPS7A2401DBVR

Texas InstrumentsIn Stock: 19846TPS7A2401DBVR Datasheet

MFR RecommendedRFQ

LP2981-28DBVR

Texas InstrumentsIn Stock: 6297LP2981-28DBVR Datasheet

Parametric EquivalentRFQ

LP2981-28DBVT

Texas InstrumentsIn Stock: 4440LP2981-28DBVT Datasheet

Parametric EquivalentRFQ

LP2981A-28DBVT

Texas InstrumentsIn Stock: 4349LP2981A-28DBVT Datasheet

Parametric EquivalentRFQ

MIC5203-2.8YM5-TR

Microchip TechnologyIn Stock: 5815MIC5203-2.8YM5-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LP2981A-28DBVR is determined by the following critical parameters:

• Fixed output voltage of 2.8V
• Positive output configuration
• 100mA output current capability (minimum)
• SOT-23-5 package compatibility
• Maximum input voltage of 16V or greater
• Operating temperature range of -40°C to 125°C
• Surface-mount mounting type
• RoHS3 compliance

Substitute parts are grouped into two categories:

Parametric Equivalents (Direct Replacements): Parts with identical electrical specifications and packaging, differing only in product status or packaging format (Cut Tape vs. Tape & Reel).

Manufacturer Recommended Alternatives: Parts with enhanced specifications (higher output current, adjustable output, improved quiescent current) that satisfy the application requirements while offering additional design flexibility or improved performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

LP2981A-28DBVT is the recommended direct replacement. It maintains all electrical and mechanical specifications of the LP2981A-28DBVR while offering Active product status, ensuring long-term availability and manufacturing support. The only difference is packaging format (Tape & Reel vs. Cut Tape & Digi-Reel), which does not affect electrical performance or PCB assembly compatibility.

LP2981-28DBVR and LP2981-28DBVT are parametric equivalents with identical electrical specifications but carry Obsolete product status, limiting their suitability for new designs or long-term production commitments.

For Enhanced Performance:

TPS7A2401DBVR offers superior specifications with 200mA output current (double the LP2981A-28DBVR), lower quiescent current (4.5 µA vs. 95 µA), and improved dropout voltage (0.25V @ 200mA vs. 0.37V @ 100mA). This device supports adjustable output voltage configuration, providing design flexibility. It maintains Active product status and full RoHS3 compliance. Selection of this part is appropriate when higher output current or lower power consumption is required.

For Cross-Manufacturer Substitution:

MIC5203-2.8YM5-TR from Microchip Technology provides a fixed 2.8V output in the same SOT-23-5 package with Active product status. However, it delivers 80mA output current (below the 100mA requirement) and exhibits higher quiescent current (750 µA vs. 95 µA). This part is suitable only for applications with reduced current demands below 80mA.

Frequently Asked Questions (FAQ)

Q: Can LP2981A-28DBVT directly replace LP2981A-28DBVR without circuit modifications?

A: Yes. Both parts are electrically and mechanically identical. The difference is packaging format: LP2981A-28DBVT is supplied in Tape & Reel format while LP2981A-28DBVR is supplied in Cut Tape & Digi-Reel format. PCB assembly compatibility and electrical performance are unchanged.

Q: Why is the MIC5203-2.8YM5-TR not recommended as a primary substitute?

A: The MIC5203-2.8YM5-TR delivers only 80mA output current, which falls below the 100mA specification of the LP2981A-28DBVR. Additionally, its quiescent current is significantly higher (750 µA vs. 95 µA), resulting in increased power consumption. This part is suitable only for applications requiring less than 80mA output current.

Q: Is TPS7A2401DBVR compatible with existing LP2981A-28DBVR designs?

A: TPS7A2401DBVR is pin-compatible and package-compatible (SOT-23-5) with the LP2981A-28DBVR. However, it is an adjustable output regulator, not a fixed output device. To use it as a direct replacement, external resistors must be added to set the output voltage to 2.8V. Designs requiring a fixed output without external components should use LP2981A-28DBVT instead.

Q: What is the significance of "Last Time Buy" status for LP2981A-28DBVR?

A: Last Time Buy status indicates that Texas Instruments has announced end-of-life production for this part. Existing inventory will be sold until depletion, after which the part will no longer be manufactured. New designs should transition to LP2981A-28DBVT (Active status) to ensure long-term supply availability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (LP2981-28DBVR, LP2981-28DBVT, LP2981A-28DBVT, MIC5203-2.8YM5-TR, and TPS7A2401DBVR) are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements.

Q: What is the maximum input voltage tolerance for these regulators?

A: LP2981A-28DBVR, LP2981-28DBVR, LP2981-28DBVT, LP2981A-28DBVT, and MIC5203-2.8YM5-TR all support a maximum input voltage of 16V. TPS7A2401DBVR supports 18V maximum input voltage, providing additional headroom for higher input voltage applications.