LP2981-29DBVT Equivalent & Substitute Parts

Part Overview

The LP2981-29DBVT is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device provides a fixed positive output of 2.9V at 100mA in a SOT-23-5 surface mount package. The part is currently obsolete, making identification of equivalent and substitute components essential for ongoing system support, design updates, and procurement continuity.

Substiute Parts

LP2981-29DBVT

Texas InstrumentsIn Stock: 1193LP2981-29DBVT Datasheet

Current PartRFQ

LP2981-29DBVR

Texas InstrumentsIn Stock: 4042LP2981-29DBVR Datasheet

Parametric EquivalentRFQ

LP2981A-29DBVR

Texas InstrumentsIn Stock: 3802LP2981A-29DBVR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP2981-29DBVT are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitutability:

• Fixed output voltage of 2.9V
• Output current rating of 100mA
• Maximum input voltage of 16V
• Voltage dropout specification of 0.37V @ 100mA
• Quiescent current of 95 µA
• SOT-23-5 package configuration
• Operating temperature range of -40°C to 125°C
• Identical protection features (Over Current, Over Temperature, Short Circuit)
• Enable control feature
• ROHS3 compliance

The identified substitutes maintain all electrical specifications and package requirements, differing only in packaging format (Tape & Reel or Cut Tape & Digi-Reel) and product availability status.

Parameter Comparison

Engineering Selection Recommendations

All three parts—LP2981-29DBVT, LP2981-29DBVR, and LP2981A-29DBVR—are electrically and functionally equivalent. Selection between them is determined by packaging and procurement requirements:

• LP2981-29DBVT: Original specification part in tube packaging
• LP2981-29DBVR: Equivalent part supplied in Tape & Reel format, suitable for automated assembly processes
• LP2981A-29DBVR: Equivalent part supplied in Cut Tape & Digi-Reel format, suitable for mixed-volume procurement

All parts maintain ROHS3 compliance and identical electrical performance. The choice between substitutes depends on assembly methodology, inventory management practices, and supplier availability rather than technical performance differences.

Frequently Asked Questions (FAQ)

Q: Can LP2981-29DBVR be used as a direct replacement for LP2981-29DBVT?

A: Yes. Both parts are electrically identical with matching output voltage (2.9V), output current (100mA), dropout voltage (0.37V @ 100mA), and package type (SOT-23-5). The difference is packaging format: DBVT uses tube packaging while DBVR uses Tape & Reel.

Q: What is the difference between LP2981-29DBVR and LP2981A-29DBVR?

A: Both parts are electrically identical. The difference is packaging format: LP2981-29DBVR is supplied in Tape & Reel (TR), while LP2981A-29DBVR is supplied in Cut Tape (CT) & Digi-Reel format.

Q: Are all three parts compatible with the same PCB layout?

A: Yes. All three parts use the identical SOT-23-5 package (SC-74A, SOT-753), ensuring pin-for-pin compatibility and identical PCB footprints.

Q: Does packaging format affect electrical performance?

A: No. Packaging format (tube, Tape & Reel, or Cut Tape) affects only handling, storage, and assembly processes. Electrical specifications and performance remain identical across all three parts.

Q: Are these parts suitable for new designs?

A: All three parts are classified as obsolete. For new designs, consult Texas Instruments for current-generation alternatives with equivalent specifications.