LP2985AIM5-1.5 Equivalent & Substitute Parts

Part Overview

The LP2985AIM5-1.5 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.5V output at 150mA in SOT-23-5 surface mount packaging. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The part provides regulated 1.5V output with integrated over-current, over-temperature, and short-circuit protection, suitable for low-power applications requiring stable voltage regulation.

Substiute Parts

LP2985AIM5-1.5

Texas InstrumentsIn Stock: 4124LP2985AIM5-1.5 Datasheet

Current PartRFQ

LT1761ES5-1.5#TRMPBF

Analog Devices Inc.In Stock: 1387LT1761ES5-1.5#TRMPBF Datasheet

MFR RecommendedRFQ

LT1761ES5-1.5#TRPBF

Analog Devices Inc.In Stock: 1486LT1761ES5-1.5#TRPBF Datasheet

MFR RecommendedRFQ

LT1761IS5-1.5#TRMPBF

Analog Devices Inc.In Stock: 1181LT1761IS5-1.5#TRMPBF Datasheet

MFR RecommendedRFQ

LT1761IS5-1.5#TRPBF

Analog Devices Inc.In Stock: 1842LT1761IS5-1.5#TRPBF Datasheet

MFR RecommendedRFQ

SPX3819M5-L-1-5/TR

MaxLinear, Inc.In Stock: 22964SPX3819M5-L-1-5/TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP2985AIM5-1.5 are selected based on the following critical parameters:

• Output voltage: 1.5V fixed
• Package compatibility: SOT-23-5 surface mount
• Operating temperature range: -40°C to 125°C
• Output configuration: Positive fixed regulator
• Control features: Enable function
• Protection features: Over-current, over-temperature protection

The substitute parts fall into two functional categories:

Category A: Direct Functional Equivalents (100mA Output) LT1761 series devices from Analog Devices Inc. provide 1.5V fixed output at 100mA in TSOT-23-5 packaging. These parts are active products with RoHS3 compliance and improved electrical characteristics including lower dropout voltage (0.45V @ 100mA) and higher PSRR (65dB @ 120Hz).

Category B: Higher Current Alternative (500mA Output) SPX3819M5-L-1-5/TR from MaxLinear Inc. provides 1.5V fixed output at 500mA in SOT-23-5 packaging. This part offers significantly higher output current capability while maintaining the same package footprint and voltage specification.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring 100mA output or less: The LT1761 series (LT1761ES5-1.5#TRMPBF, LT1761ES5-1.5#TRPBF, LT1761IS5-1.5#TRMPBF, LT1761IS5-1.5#TRPBF) from Analog Devices Inc. are recommended as primary substitutes. All variants are active products with RoHS3 compliance. The LT1761 devices offer improved electrical performance with lower dropout voltage and higher PSRR compared to the LP2985AIM5-1.5. The packaging difference between SOT-23-5 and TSOT-23-5 (thin variant) is mechanically compatible for standard PCB layouts. Packaging options include Cut Tape (CT) & Digi-Reel and Tape & Reel (TR) formats.

For applications requiring higher output current (up to 500mA): The SPX3819M5-L-1-5/TR from MaxLinear Inc. provides a higher current alternative while maintaining the same 1.5V output voltage and SOT-23-5 package footprint. This part is an active product with RoHS compliance. The SPX3819 is suitable for designs where the LP2985AIM5-1.5's 150mA limitation is insufficient. Input voltage rating matches the original part at 16V maximum.

Compliance considerations: All substitute parts are active products with current manufacturing support. The LT1761 series and SPX3819M5-L-1-5/TR offer superior RoHS compliance status compared to the obsolete LP2985AIM5-1.5. All parts maintain the same operating temperature range and MSL rating.

Frequently Asked Questions (FAQ)

Q: Can LT1761 devices directly replace the LP2985AIM5-1.5 in existing designs? A: LT1761 devices are functionally compatible for applications requiring 100mA or less output current. The package difference between SOT-23-5 and TSOT-23-5 is a thin variant of the same footprint and is mechanically compatible with standard PCB layouts. Electrical characteristics are superior, with lower dropout voltage and higher PSRR.

Q: What is the difference between LT1761ES5 and LT1761IS5 variants? A: The ES5 variant specifies commercial temperature operation, while IS5 specifies industrial temperature operation. Both operate across the -40°C to 125°C range. Selection depends on procurement specifications and quality grade requirements.

Q: What is the difference between TRMPBF and TRPBF packaging options? A: Both are Tape & Reel (TR) formats. TRMPBF and TRPBF differ in tape configuration and reel specifications. Both are compatible for automated assembly processes. Selection depends on equipment compatibility and procurement preferences.

Q: When should SPX3819M5-L-1-5/TR be selected over LT1761 devices? A: Select SPX3819M5-L-1-5/TR when the application requires output current exceeding 100mA up to 500mA. The SPX3819 maintains the same 1.5V output voltage and SOT-23-5 package compatibility while providing significantly higher current capability.

Q: Are there any thermal or layout considerations when switching from LP2985AIM5-1.5 to substitute parts? A: The LT1761 series offers lower dropout voltage (0.45V vs 0.58V), resulting in reduced power dissipation and heat generation. SPX3819M5-L-1-5/TR has significantly lower quiescent current (8µA vs 95µA), improving efficiency in low-load conditions. Both factors may allow for simplified thermal management compared to the original part.

Q: What is the inventory status of substitute parts? A: LT1761ES5-1.5#TRMPBF: 1,288 pcs; LT1761ES5-1.5#TRPBF: 1,404 pcs; LT1761IS5-1.5#TRMPBF: 1,160 pcs; LT1761IS5-1.5#TRPBF: 1,800 pcs; SPX3819M5-L-1-5/TR: 22,900 pcs. All parts are new original stock.