LP2985IM5-3.6 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2985IM5-3.6 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This device delivers 150mA output current at a fixed 3.6V output voltage with a maximum dropout voltage of 0.58V at full load. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain identical electrical performance characteristics and package compatibility to ensure direct replacement capability in existing circuit designs.

Substiute Parts

LP2985IM5-3.6

Texas InstrumentsIn Stock: 2054LP2985IM5-3.6 Datasheet

Current PartRFQ

LP2985AIM5-3.6/NOPB

Texas InstrumentsIn Stock: 1000267LP2985AIM5-3.6/NOPB Datasheet

Parametric EquivalentRFQ

LP2985AIM5X-3.6/NOPB

National SemiconductorIn Stock: 4385LP2985AIM5X-3.6/NOPB Datasheet

Parametric EquivalentRFQ

LP2985IM5-3.6/NOPB

Texas InstrumentsIn Stock: 23354LP2985IM5-3.6/NOPB Datasheet

Parametric EquivalentRFQ

MIC5205-3.6YM5-TR

Microchip TechnologyIn Stock: 9165MIC5205-3.6YM5-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP2985IM5-3.6 are qualified based on the following critical parameters that determine functional equivalence:

• Output voltage: 3.6V fixed
• Output current capability: 150mA minimum
• Maximum input voltage: 16V or greater
• Package: SOT-23-5 surface mount
• Operating temperature range: -40°C to 125°C minimum
• Control and protection features: Enable function with over-current, over-temperature, and short-circuit protection

Parts are grouped into two categories: parametric equivalents from Texas Instruments and National Semiconductor that maintain identical electrical specifications, and a manufacturer-recommended alternative from Microchip Technology that meets all functional requirements with minor performance variations.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the obsolete LP2985IM5-3.6, the following selection criteria apply:

Primary Substitutes (Texas Instruments LP2985 Series): LP2985AIM5-3.6/NOPB and LP2985IM5-3.6/NOPB are direct parametric equivalents with identical electrical specifications. Both are active products with ROHS3 compliance. LP2985AIM5-3.6/NOPB is available in Tape & Reel packaging, while LP2985IM5-3.6/NOPB is available in Cut Tape and Digi-Reel formats. Selection between these should be based on packaging requirements and inventory availability.

Alternative Substitute (National Semiconductor): LP2985AIM5X-3.6/NOPB from National Semiconductor maintains identical electrical performance and is an active product with ROHS3 compliance. This part is suitable for direct replacement where National Semiconductor sourcing is preferred.

Cross-Manufacturer Alternative (Microchip Technology): MIC5205-3.6YM5-TR from Microchip Technology meets all functional requirements with improved performance characteristics: lower dropout voltage (0.35V vs 0.58V) and higher PSRR (75dB at 100Hz vs 45dB at 1kHz). Quiescent current is slightly higher at 150 µA. This part is active and ROHS3 compliant. The MIC5205 is suitable for new designs or applications where improved efficiency is beneficial.

All substitute parts are available in SOT-23-5 packaging and support the full operating temperature range of -40°C to 125°C.

Frequently Asked Questions (FAQ)

Q: Can LP2985AIM5-3.6/NOPB directly replace LP2985IM5-3.6? A: Yes. Both parts share identical electrical specifications including output voltage, current rating, dropout voltage, and quiescent current. The primary difference is product status: LP2985AIM5-3.6/NOPB is active while the original is obsolete. Packaging format differs (Tape & Reel vs standard), but the die and electrical performance are equivalent.

Q: What is the difference between LP2985IM5-3.6/NOPB and LP2985AIM5-3.6/NOPB? A: Both are Texas Instruments LP2985 regulators with identical electrical specifications. The primary distinction is packaging: LP2985IM5-3.6/NOPB is supplied in Cut Tape and Digi-Reel formats, while LP2985AIM5-3.6/NOPB is supplied in Tape & Reel format. Selection depends on assembly line requirements and volume needs.

Q: Is MIC5205-3.6YM5-TR a suitable replacement? A: Yes, MIC5205-3.6YM5-TR is functionally compatible for the same 3.6V, 150mA application. It offers improved performance with lower dropout voltage (0.35V vs 0.58V) and higher PSRR (75dB vs 45dB). Quiescent current is slightly elevated at 150 µA. The SOT-23-5 package is identical, making it suitable for direct board-level replacement.

Q: Are all substitute parts RoHS compliant? A: The original LP2985IM5-3.6 is RoHS non-compliant. All substitute parts listed (LP2985AIM5-3.6/NOPB, LP2985AIM5X-3.6/NOPB, LP2985IM5-3.6/NOPB, and MIC5205-3.6YM5-TR) are ROHS3 compliant, meeting current environmental regulations.

Q: Can these parts be used interchangeably in production? A: Yes, within the same manufacturer family (LP2985 variants), parts are directly interchangeable. When switching to MIC5205-3.6YM5-TR, the improved dropout voltage and PSRR may provide benefits in power-sensitive applications, but no circuit modifications are required for basic functionality.

Q: What packaging options are available? A: All substitute parts use SOT-23-5 surface mount packaging. Packaging formats vary: LP2985AIM5-3.6/NOPB is supplied in Tape & Reel, LP2985IM5-3.6/NOPB in Cut Tape and Digi-Reel, LP2985AIM5X-3.6/NOPB in standard format, and MIC5205-3.6YM5-TR in Cut Tape and Digi-Reel. Selection should match assembly equipment requirements.