LP2981A-29DBVR Equivalent & Substitute Parts

Part Overview

The LP2981A-29DBVR is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This Surface Mount device delivers 100mA output current with a fixed 2.9V output voltage and operates across an input range up to 16V. The part is classified as Obsolete, making identification of suitable substitute components essential for ongoing design support and procurement planning.

Substiute Parts

LP2981A-29DBVR

Texas InstrumentsIn Stock: 3802LP2981A-29DBVR Datasheet

Current PartRFQ

LP2981A-30DBVR

Texas InstrumentsIn Stock: 4346LP2981A-30DBVR Datasheet

MFR RecommendedRFQ

LP2981-29DBVR

Texas InstrumentsIn Stock: 4042LP2981-29DBVR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP2981A-29DBVR are identified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Output voltage configuration (Fixed output type)
• Output current capability (100mA minimum)
• Maximum input voltage rating (16V or higher)
• Package type (SOT-23-5 form factor)
• Dropout voltage performance (0.37V @ 100mA or lower)
• Operating temperature range (-40°C ~ 125°C)
• Protection features (Over Current, Over Temperature, Short Circuit)

Substitute Categories:

MFR Recommended Substitute: LP2981A-30DBVR differs in output voltage (3V vs. 2.9V) but maintains identical electrical performance across all other critical parameters. This part is Active status and represents the manufacturer's recommended alternative.

Parametric Equivalent: LP2981-29DBVR matches the output voltage specification (2.9V) and all electrical parameters identically. This part differs only in packaging format (Tape & Reel vs. Cut Tape) and product status (Obsolete).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Output Voltage): LP2981-29DBVR serves as a parametric equivalent with identical 2.9V output voltage and electrical specifications. Both the main part and this substitute are classified as Obsolete. Selection between these parts depends on packaging requirements: LP2981A-29DBVR is supplied in Cut Tape format, while LP2981-29DBVR is supplied in Tape & Reel format.

For Active Product Availability: LP2981A-30DBVR is the manufacturer-recommended substitute and carries Active product status, ensuring ongoing availability and support. This part maintains all electrical performance parameters identically to the main part with the exception of output voltage, which is specified at 3V instead of 2.9V. This 0.1V difference must be evaluated against circuit design requirements. The LP2981A-30DBVR is ROHS3 Compliant and carries MSL Rating 1 (Unlimited), matching the compliance profile of the original part.

Compliance Considerations: All three parts maintain ROHS3 Compliance and MSL Rating 1 (Unlimited), ensuring compatibility with modern manufacturing and environmental standards. Selection should prioritize the Active status LP2981A-30DBVR for new designs and long-term procurement stability.

Frequently Asked Questions (FAQ)

Q: Can LP2981A-30DBVR replace LP2981A-29DBVR directly in my circuit? A: LP2981A-30DBVR is electrically compatible across all parameters except output voltage. The substitute provides 3V output versus the original 2.9V. Direct substitution is possible only if your circuit design tolerates a 0.1V output voltage difference. Verify that downstream components accept the 3V supply voltage range.

Q: What is the difference between LP2981A-29DBVR and LP2981-29DBVR? A: These parts are parametrically identical with matching 2.9V output voltage and all electrical specifications. The primary difference is packaging format: LP2981A-29DBVR is supplied in Cut Tape (CT) format, while LP2981-29DBVR is supplied in Tape & Reel (TR) format. Both parts are Obsolete.

Q: Why is LP2981A-29DBVR classified as Obsolete? A: The Obsolete status indicates this part is no longer in active production. Texas Instruments recommends transitioning to LP2981A-30DBVR, which maintains Active status and ensures continued availability for future procurement.

Q: Are all substitute parts in the same SOT-23-5 package? A: Yes. LP2981A-29DBVR, LP2981A-30DBVR, and LP2981-29DBVR all use the SOT-23-5 package (SC-74A, SOT-753 designations). This ensures mechanical and electrical compatibility at the board level.

Q: Do the substitute parts maintain the same protection features? A: Yes. All substitute parts include identical protection features: Over Current, Over Temperature, and Short Circuit protection. Operating temperature range remains -40°C ~ 125°C across all options.

Q: What is the inventory status for these parts? A: LP2981A-29DBVR has 3790 Pcs New Original In Stock. LP2981A-30DBVR has 4267 Pcs New Original In Stock. LP2981-29DBVR has 4012 Pcs New Original In Stock. Inventory levels are subject to change.