LP2985-29DBVT Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2985-29DBVT is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This device delivers 150mA output current at a fixed 2.9V output voltage in a compact SOT-23-5 surface mount package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Suitable alternatives are available from both Texas Instruments and Microchip Technology with matching or enhanced electrical characteristics.

Substiute Parts

LP2985-29DBVT

Texas InstrumentsIn Stock: 1189LP2985-29DBVT Datasheet

Current PartRFQ

LP2985A-29DBVR

Texas InstrumentsIn Stock: 6349LP2985A-29DBVR Datasheet

Parametric EquivalentRFQ

LP2985AIM5-2.9/NOPB

Texas InstrumentsIn Stock: 1960LP2985AIM5-2.9/NOPB Datasheet

Parametric EquivalentRFQ

LP2985IM5-2.9/NOPB

Texas InstrumentsIn Stock: 2420LP2985IM5-2.9/NOPB Datasheet

Parametric EquivalentRFQ

MIC5205-2.9YM5-TR

Microchip TechnologyIn Stock: 835MIC5205-2.9YM5-TR Datasheet

MFR RecommendedRFQ

MIC5207-2.9YM5-TR

Microchip TechnologyIn Stock: 869MIC5207-2.9YM5-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP2985-29DBVT are grouped based on strict electrical and mechanical parameter matching:

Primary Substitution Criteria:

• Fixed output voltage of 2.9V
• Output current capability of 150mA or greater
• Maximum input voltage of 16V or higher
• SOT-23-5 package compatibility
• Operating temperature range of -40°C to 125°C
• Enable control feature
• Surface mount technology

Substitute Categories:

Texas Instruments Direct Equivalents (LP2985A-29DBVR, LP2985AIM5-2.9/NOPB, LP2985IM5-2.9/NOPB): These parts maintain identical electrical specifications to the main part, including 150mA output current, 0.58V dropout voltage, and 95 µA quiescent current. Differences exist only in packaging format (tape & reel versus cut tape) and product status (active versus obsolete).

Microchip Technology Alternatives (MIC5205-2.9YM5-TR, MIC5207-2.9YM5-TR): These parts meet the core substitution requirements with identical 2.9V output and SOT-23-5 packaging. MIC5205 maintains 150mA output current with improved dropout voltage (0.35V) and PSRR (75dB). MIC5207 provides enhanced output current (180mA) with 0.4V dropout voltage, suitable for applications requiring higher current capacity.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select LP2985A-29DBVR as the primary choice. This part is active status from Texas Instruments with identical electrical performance to the obsolete LP2985-29DBVT. It maintains 150mA output current, 0.58V dropout voltage, and 95 µA quiescent current. ROHS3 compliance and unlimited moisture sensitivity level match the original specification.

For Enhanced Performance with Active Status: MIC5205-2.9YM5-TR from Microchip Technology provides improved dropout voltage (0.35V versus 0.58V) and superior PSRR (75dB versus 45dB) while maintaining 150mA output current. This part is active status and ROHS3 compliant, suitable for designs where lower dropout voltage reduces thermal dissipation requirements.

For Higher Current Applications: MIC5207-2.9YM5-TR delivers 180mA output current with 0.4V dropout voltage, providing design margin for applications approaching the 150mA limit. This part is active status and ROHS3 compliant.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), ensuring compatibility with standard manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can LP2985A-29DBVR directly replace LP2985-29DBVT without circuit modification?

A: Yes. LP2985A-29DBVR is electrically and mechanically identical to LP2985-29DBVT. Both deliver 2.9V fixed output at 150mA with 0.58V dropout voltage in SOT-23-5 packaging. The only difference is product status (active versus obsolete). No circuit changes are required.

Q: What is the advantage of using MIC5205-2.9YM5-TR over the Texas Instruments alternatives?

A: MIC5205-2.9YM5-TR offers lower dropout voltage (0.35V versus 0.58V) and higher PSRR (75dB versus 45dB). Lower dropout voltage reduces power dissipation and heat generation. Higher PSRR improves noise rejection on the output. Both are active status parts from an established manufacturer.

Q: When should MIC5207-2.9YM5-TR be selected instead of MIC5205-2.9YM5-TR?

A: MIC5207-2.9YM5-TR provides 180mA output current versus 150mA in MIC5205. Select MIC5207 for applications requiring output current approaching or exceeding 150mA, or where design margin for current headroom is necessary.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts use SOT-23-5 (SC-74A) surface mount packaging, ensuring mechanical compatibility. Packaging format differences (tape & reel versus cut tape) do not affect electrical performance or board-level compatibility.

Q: Do substitute parts maintain the same protection features?

A: Texas Instruments alternatives (LP2985A-29DBVR, LP2985AIM5-2.9/NOPB, LP2985IM5-2.9/NOPB) maintain identical protection: over current, over temperature, and short circuit. Microchip alternatives (MIC5205-2.9YM5-TR, MIC5207-2.9YM5-TR) provide over current, over temperature, and reverse polarity protection, offering additional reverse polarity safeguard.

Q: Are all parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant with unlimited moisture sensitivity level (MSL 1), meeting standard environmental and manufacturing requirements.