LP2985IM5-3.1/NOPB Equivalent & Substitute Parts

Part Overview

The LP2985IM5-3.1/NOPB is a linear voltage regulator IC manufactured by Texas Instruments, designed for positive fixed output applications. This Surface Mount device delivers 150mA output current with a fixed 3.1V output voltage and operates across an input range up to 16V. The part is currently in Active product status with 1692 units in stock. Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing, inventory constraints, or specific performance characteristics aligned with the original specifications.

Substiute Parts

LP2985IM5-3.1/NOPB

Texas InstrumentsIn Stock: 1766LP2985IM5-3.1/NOPB Datasheet

Current PartRFQ

LP2985AIM5-3.1/NOPB

National SemiconductorIn Stock: 23224LP2985AIM5-3.1/NOPB Datasheet

Parametric EquivalentRFQ

LP2985AIM5X-3.1/NOPB

Texas InstrumentsIn Stock: 6969LP2985AIM5X-3.1/NOPB Datasheet

Parametric EquivalentRFQ

MIC5205-3.1YM5-TR

Microchip TechnologyIn Stock: 3815MIC5205-3.1YM5-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP2985IM5-3.1/NOPB are qualified based on the following critical parameters that must align with the original specification:

• Fixed output voltage of 3.1V
• Output current capability of 150mA
• Maximum input voltage of 16V or greater
• SOT-23-5 package compatibility
• Surface Mount mounting type
• Operating temperature range of -40°C to 125°C
• Enable control feature
• Protection against over current, over temperature, and short circuit conditions

Parts meeting these electrical and mechanical criteria are classified as parametric equivalents or manufacturer-recommended alternatives. Variations in secondary parameters such as quiescent current, dropout voltage, or PSRR do not disqualify substitution when primary specifications are maintained.

Parameter Comparison

Engineering Selection Recommendations

LP2985AIM5-3.1/NOPB is a parametric equivalent with identical electrical specifications and Active product status. This part offers the highest inventory availability at 23200 units and maintains full compliance with ROHS3 standards where specified.

LP2985AIM5X-3.1/NOPB is a parametric equivalent with identical electrical specifications but carries Last Time Buy product status, indicating discontinued or end-of-life designation. Selection of this part should be limited to applications where existing inventory reserves are sufficient or where long-term supply is not a requirement.

MIC5205-3.1YM5-TR is a manufacturer-recommended alternative from Microchip Technology with Active product status. This part maintains all critical electrical parameters while offering improved dropout voltage performance (0.35V versus 0.58V) and enhanced PSRR (75dB at 100Hz versus 45dB at 1kHz). The quiescent current is higher at 150 µA compared to 95 µA in the original part. Protection features include reverse polarity protection in addition to over current and over temperature protection. This part is suitable for applications where lower dropout voltage or superior noise rejection is beneficial.

Frequently Asked Questions (FAQ)

Q: Can LP2985AIM5-3.1/NOPB be used as a direct replacement for LP2985IM5-3.1/NOPB?

A: Yes. Both parts share identical electrical specifications including output voltage, output current, input voltage range, dropout voltage, quiescent current, PSRR, and protection features. Both are housed in SOT-23-5 packages and operate across the same temperature range. The parts are electrically interchangeable.

Q: What is the difference between LP2985AIM5X-3.1/NOPB and the original part?

A: The LP2985AIM5X-3.1/NOPB is electrically identical to the original LP2985IM5-3.1/NOPB. The primary difference is product status: LP2985AIM5X-3.1/NOPB is designated Last Time Buy, indicating the manufacturer is discontinuing this part. Packaging differs (Cut Tape versus Tape & Reel), but electrical performance remains unchanged.

Q: Why would MIC5205-3.1YM5-TR be selected over the LP2985 series?

A: The MIC5205-3.1YM5-TR offers lower dropout voltage (0.35V versus 0.58V) and higher PSRR (75dB at 100Hz), making it advantageous for applications requiring reduced power dissipation or superior power supply rejection. The addition of reverse polarity protection provides enhanced circuit protection. These benefits come at the cost of slightly higher quiescent current (150 µA versus 95 µA).

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts are housed in SC-74A, SOT-753 (SOT-23-5) packages, ensuring mechanical and electrical compatibility on the PCB without layout modifications.

Q: What compliance certifications apply to these parts?

A: All parts listed are ROHS3 compliant where specified, REACH unaffected, and classified under ECCN EAR99. HTSUS classification is 8542.39.0001 for all parts. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts.

Q: Can these parts be used interchangeably in production?

A: LP2985AIM5-3.1/NOPB and LP2985IM5-3.1/NOPB are fully interchangeable. MIC5205-3.1YM5-TR is interchangeable from an electrical and mechanical standpoint but introduces different performance characteristics in dropout voltage and PSRR. LP2985AIM5X-3.1/NOPB should not be selected for new production due to Last Time Buy status.