MCP1812BT-033/LT Equivalent & Substitute Parts

Part Overview

The MCP1812BT-033/LT is a linear voltage regulator IC manufactured by Microchip Technology, designed to deliver a fixed 3.3V output at 300mA in a compact SC-70-5 package. This device is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part provides positive fixed output regulation with integrated enable control and over-current protection features.

Substiute Parts

MCP1812BT-033/LT

Microchip TechnologyIn Stock: 1022MCP1812BT-033/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 MCP1812BT-033/LT is determined by the following critical parameters:

• Output Voltage: Must be fixed at 3.3V
• Output Current Capability: Must support 300mA minimum
• Input Voltage Range: Must accept up to 5.5V maximum input
• Control Features: Must include Enable functionality
• Protection Features: Must include Over Current protection
• Mounting Type: Surface Mount required
• Manufacturer: Microchip Technology (same manufacturer ensures design continuity and support)

The MIC5504-3.3YM5-TR meets all substitution criteria while offering an active product status and improved electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The MIC5504-3.3YM5-TR is the direct substitute for the obsolete MCP1812BT-033/LT. Both devices are manufactured by Microchip Technology and share identical output voltage and current specifications. The substitute part offers active product status, ensuring long-term availability and supply chain continuity.

The MIC5504-3.3YM5-TR provides improved electrical performance with lower dropout voltage (0.38V versus 0.6V) and higher PSRR (60dB versus 50dB). The extended operating temperature range (-40°C ~ 125°C versus -40°C ~ 85°C) and additional over-temperature protection expand application flexibility. The substitute achieves ROHS3 compliance, meeting current regulatory requirements.

Package transition from SC-70-5 to SOT-23-5 requires PCB layout modification. Both packages are industry-standard surface-mount formats with equivalent pin counts and similar footprint dimensions, enabling straightforward redesign.

Frequently Asked Questions (FAQ)

Q: Can the MIC5504-3.3YM5-TR directly replace the MCP1812BT-033/LT without circuit modifications?

A: Electrical substitution is direct. Both parts deliver 3.3V at 300mA with identical input voltage specifications and control features. PCB layout modification is required due to package change from SC-70-5 to SOT-23-5. Pin configuration remains compatible.

Q: What is the impact of the package change from SC-70-5 to SOT-23-5?

A: Both packages are 5-pin surface-mount formats. SOT-23-5 has a slightly larger footprint than SC-70-5. PCB redesign is necessary to accommodate the new package dimensions, but no schematic changes are required.

Q: Does the higher quiescent current (55 µA versus 0.5 µA) in the substitute part affect system performance?

A: Quiescent current difference is relevant only in ultra-low-power standby applications. For standard 300mA output operation, this parameter has negligible impact on overall system power consumption.

Q: Is the MIC5504-3.3YM5-TR suitable for applications requiring the full -40°C ~ 85°C temperature range?

A: Yes. The substitute part operates across -40°C ~ 125°C, which fully encompasses the original part's temperature specification.

Q: What compliance certifications does the substitute part carry?

A: The MIC5504-3.3YM5-TR is ROHS3 compliant and REACH unaffected. Both parts carry EAR99 export classification and identical HTSUS codes.