MCP1812AT-025/LB Equivalent & Substitute Parts

Part Overview

The MCP1812AT-025/LB is a linear voltage regulator IC manufactured by Microchip Technology, designed to deliver a fixed 2.5V output at 300mA. This device operates as a positive fixed regulator with a single output configuration and is housed in an SC-70-3 surface mount package. The part is currently classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

MCP1812AT-025/LB

Microchip TechnologyIn Stock: 871MCP1812AT-025/LB Datasheet

Current PartRFQ

MIC5504-2.5YM5-TR

Microchip TechnologyIn Stock: 1910MIC5504-2.5YM5-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MCP1812AT-025/LB is determined by the following critical electrical and mechanical parameters:

• Fixed output voltage of 2.5V
• Minimum output current capability of 300mA
• Maximum input voltage rating of 5.5V or greater
• Voltage dropout specification compatible with system requirements
• Surface mount packaging with compatible pinout and footprint
• Control features including enable functionality
• Over-current protection capability

The MIC5504-2.5YM5-TR qualifies as a direct substitute based on matching these core parameters while offering improved electrical characteristics and active product status.

Parameter Comparison

Engineering Selection Recommendations

The MIC5504-2.5YM5-TR is the manufacturer-recommended substitute for the obsolete MCP1812AT-025/LB. Both devices are manufactured by Microchip Technology and maintain identical electrical specifications for output voltage, output current, and input voltage ratings.

The MIC5504-2.5YM5-TR offers several advantages: improved voltage dropout performance (0.38V versus 0.6V), extended operating temperature range (-40°C to 125°C versus -85°C), enhanced PSRR (60dB versus 50dB), and additional over-temperature protection. The substitute carries active product status with ROHS3 compliance and REACH unaffected designation.

Package transition from SC-70-3 to SOT-23-5 requires PCB layout modification. Both packages are industry-standard surface mount configurations with established design support.

Frequently Asked Questions (FAQ)

Q: Can the MIC5504-2.5YM5-TR directly replace the MCP1812AT-025/LB without circuit modification?

A: Electrical substitution is valid based on matching output voltage, current rating, and input voltage specifications. However, package geometry differs (SC-70-3 versus SOT-23-5), requiring PCB footprint redesign. Pinout compatibility must be verified against specific application schematics.

Q: What is the impact of the voltage dropout difference between these parts?

A: The MIC5504-2.5YM5-TR exhibits lower dropout voltage (0.38V versus 0.6V), resulting in improved efficiency and reduced heat dissipation. This represents a performance enhancement for the substitute part.

Q: Why does the MIC5504-2.5YM5-TR have higher quiescent current?

A: The quiescent current specification (55 µA versus 0.5 µA) reflects different measurement conditions and device architecture. Both values remain within acceptable ranges for typical linear regulator applications.

Q: Is the extended temperature range of the MIC5504-2.5YM5-TR relevant for my application?

A: The MIC5504-2.5YM5-TR operates to 125°C versus 85°C for the original part. This extended range provides additional design margin for applications with elevated ambient or junction temperatures.

Q: What certifications apply to the substitute part?

A: The MIC5504-2.5YM5-TR is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.