LP2981-28DBVT Equivalent & Substitute Parts

Part Overview

The LP2981-28DBVT 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 marked as obsolete, making identification of equivalent and substitute parts essential for design continuity and procurement planning. This reference provides engineering-grade alternatives based on electrical and mechanical compatibility parameters.

Substiute Parts

LP2981-28DBVT

Texas InstrumentsIn Stock: 4440LP2981-28DBVT Datasheet

Current PartRFQ

TPS7A2401DBVR

Texas InstrumentsIn Stock: 19846TPS7A2401DBVR Datasheet

MFR RecommendedRFQ

LP2981-28DBVR

Texas InstrumentsIn Stock: 6297LP2981-28DBVR Datasheet

Parametric EquivalentRFQ

LP2981A-28DBVR

Texas InstrumentsIn Stock: 4420LP2981A-28DBVR Datasheet

Parametric EquivalentRFQ

LP2981A-28DBVT

Texas InstrumentsIn Stock: 4349LP2981A-28DBVT Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP2981-28DBVT are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents — Parts that maintain identical electrical specifications (fixed 2.8V output, 100mA current rating, 16V maximum input, 0.37V dropout voltage, identical protection features) and share the same SOT-23-5 package. These parts differ only in packaging format (Tape & Reel vs. Cut Tape) or product status (Active vs. Last Time Buy). Parametric equivalents include LP2981-28DBVR, LP2981A-28DBVR, and LP2981A-28DBVT.

Functional Substitute — The TPS7A2401DBVR is a higher-performance alternative with enhanced electrical characteristics. While it operates in the same SOT-23-5 package and maintains positive output configuration, it features adjustable output voltage (1.24V to 17.75V), higher current output (200mA), lower quiescent current (4.5µA vs. 95µA), and improved dropout voltage (0.25V @ 200mA). This part is suitable for applications requiring greater flexibility and efficiency, though it requires output voltage configuration via external resistors.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents):

LP2981A-28DBVT is the primary recommended substitute. It maintains identical electrical specifications and is currently in Active product status, ensuring long-term availability and supply chain stability. The part is ROHS3 compliant and carries MSL 1 rating. This part is suitable for applications requiring a direct pin-compatible replacement without circuit modification.

LP2981A-28DBVR provides equivalent electrical performance with Cut Tape & Digi-Reel packaging. It is marked as Last Time Buy, indicating limited future availability. This part is appropriate for immediate procurement needs but should not be selected for new long-term designs.

LP2981-28DBVR is electrically identical but carries Obsolete status, making it unsuitable for new designs or long-term supply planning.

For Enhanced Performance (Functional Substitute):

TPS7A2401DBVR is an Active product offering superior electrical characteristics: adjustable output voltage, doubled current output (200mA), significantly reduced quiescent current (4.5µA), and improved dropout voltage (0.25V @ 200mA). This part requires external resistor network configuration to set output voltage to 2.8V but provides enhanced efficiency and flexibility. It is suitable for applications where power consumption optimization or higher current delivery is beneficial. All compliance certifications (ROHS3, MSL 1) are maintained.

Frequently Asked Questions (FAQ)

Q: Can LP2981A-28DBVT be used as a direct replacement for LP2981-28DBVT?

A: Yes. LP2981A-28DBVT is a parametric equivalent with identical electrical specifications, package type (SOT-23-5), and pin configuration. No circuit modifications are required. The primary difference is product status: LP2981A-28DBVT is Active while LP2981-28DBVT is Obsolete.

Q: What is the difference between LP2981-28DBVT and LP2981-28DBVR?

A: Both parts are electrically identical with fixed 2.8V output and 100mA current rating. The difference is packaging format: DBVT indicates Tape & Reel packaging, while DBVR indicates Cut Tape & Digi-Reel packaging. Both are now Obsolete.

Q: Can TPS7A2401DBVR replace LP2981-28DBVT without circuit changes?

A: TPS7A2401DBVR shares the same SOT-23-5 package and pin count, but it is an adjustable output regulator. Direct substitution requires external resistor network configuration to set output voltage to 2.8V. The part is not pin-compatible without additional components. However, it offers superior performance characteristics including lower quiescent current and higher output current capacity.

Q: Why is LP2981-28DBVT marked as Obsolete?

A: Product status reflects Texas Instruments' lifecycle management. Obsolete status indicates the part is no longer in production. LP2981A-28DBVT (Active status) is the recommended long-term alternative.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All parts listed—LP2981-28DBVR, LP2981A-28DBVR, LP2981A-28DBVT, and TPS7A2401DBVR—are ROHS3 compliant with MSL 1 rating.

Q: Which substitute part should be selected for new designs?

A: LP2981A-28DBVT is the recommended choice for new designs. It is in Active product status, ensuring availability and supply chain continuity. It provides identical electrical performance and requires no circuit modifications.