MCP1812AT-040/LT Equivalent & Substitute Parts

Part Overview

The MCP1812AT-040/LT is a linear voltage regulator IC from Microchip Technology designed for positive fixed 4V output at 300mA in SC-70-5 surface mount packaging. This device is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity. The regulator features enable control and over-current protection, operating across -40°C to 85°C.

Substiute Parts

MCP1812AT-040/LT

Microchip TechnologyIn Stock: 1048MCP1812AT-040/LT Datasheet

Current PartRFQ

MIC5504-3.3YM5-TR

Microchip TechnologyIn Stock: 18322MIC5504-3.3YM5-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MCP1812AT-040/LT is determined by the following critical parameters:

• Output voltage configuration (positive fixed output)
• Output current capability (300mA minimum)
• Input voltage range compatibility (5.5V maximum)
• Surface mount packaging (SC-70-5 or equivalent 5-pin SOT variants)
• Enable control functionality
• Over-current protection

The MIC5504-3.3YM5-TR qualifies as a manufacturer-recommended substitute based on matching output current (300mA), input voltage maximum (5.5V), surface mount technology, enable control, and over-current protection. However, the output voltage differs (3.3V vs. 4V), which restricts its application to circuits designed for 3.3V regulation only.

Parameter Comparison

Engineering Selection Recommendations

The MIC5504-3.3YM5-TR is the manufacturer-recommended substitute for the obsolete MCP1812AT-040/LT. Selection of this substitute is appropriate when the following conditions are met:

• Circuit design requires 3.3V fixed output regulation (not 4V)
• 300mA output current capability is sufficient
• Operating temperature range of -40°C to 125°C is acceptable
• SOT-23-5 package footprint can be accommodated in PCB layout
• ROHS3 compliance is required for the application

The substitute offers improved performance characteristics including lower dropout voltage (0.38V vs. 0.6V), higher PSRR (60dB vs. 50dB), and extended operating temperature range. Over-temperature protection is included in the substitute, providing additional circuit safeguarding.

Frequently Asked Questions (FAQ)

Q: Can the MIC5504-3.3YM5-TR directly replace the MCP1812AT-040/LT without circuit modification?

A: Direct replacement is not possible due to different output voltages (3.3V vs. 4V). The substitute is suitable only for applications designed for 3.3V regulation. Circuit redesign is required if 4V output is mandatory.

Q: What are the package differences between these parts?

A: The MCP1812AT-040/LT uses SC-70-5 (SOT-353) packaging, while the MIC5504-3.3YM5-TR uses SOT-23-5 (SC-74A) packaging. Both are 5-pin surface mount packages but have different footprints and pin spacing. PCB layout modification is necessary for substitution.

Q: Are there compliance differences between the main part and substitute?

A: The MIC5504-3.3YM5-TR is ROHS3 compliant and REACH unaffected. The MCP1812AT-040/LT compliance status is not specified in the provided data. Both parts carry EAR99 ECCN classification and identical HTSUS codes.

Q: How do the quiescent current specifications compare?

A: The MCP1812AT-040/LT draws 0.5 µA quiescent current, while the MIC5504-3.3YM5-TR draws 55 µA. For battery-powered or ultra-low-power applications, the original part offers superior standby current performance.

Q: What is the significance of the dropout voltage difference?

A: The MIC5504-3.3YM5-TR has lower dropout voltage (0.38V vs. 0.6V), allowing operation with lower input voltages or providing better efficiency in power-limited applications.