78M05MFK

Overview

The 78M05MFK is a fixed linear voltage regulator manufactured by Rochester Electronics, LLC. It provides a nominal output voltage of 5V with a maximum load current capability of 1.5A. The device utilizes a 20-lead Low Profile Quad Flat Package (LCC) in a tube configuration. Designed for robust performance, it supports an input voltage range up to 35V and operates within a temperature range from -40°C to 125°C. The component features internal thermal overload protection and short-circuit current limiting to ensure reliability under fault conditions.

Feature Summary

• Provides a stable fixed 5V output voltage suitable for standard logic and analog circuits
• Includes built-in thermal shutdown and current limiting protection mechanisms
• Capable of delivering up to 1.5A continuous load current
• Constructed in a compact 20-lead LCC surface-mount package

Applications

• General-purpose regulated power supplies requiring 5V rails
• Embedded systems utilizing 5V logic families
• Industrial control modules operating in high-temperature environments
• Telecommunications equipment power distribution networks

Procurement Notes

Verify the specific lot date code and manufacturing origin upon receipt, as Rochester Electronics sources components through authorized continuing supply channels. Confirm that the 20-LCC package matches the footprint requirements of the target PCB design. Ensure that the input voltage applied does not exceed the absolute maximum ratings defined in the official datasheet to prevent device damage. Request test reports if application criticality demands strict adherence to original OEM electrical specifications.

Selection Notes

Select this component when a fixed 5V regulation is required with moderate current handling capabilities up to 1.5A. The 20-lead LCC package offers a compact solution for space-constrained designs compared to traditional through-hole regulators. Consider the thermal performance characteristics of the LCC package for heat dissipation planning. This part is suitable for applications where a wide operating temperature range and internal protection features are essential for system stability.

Part Context

This regulator belongs to the MC78Mxx series family, which represents a line of medium-current positive voltage regulators. The 'M' designation typically indicates the 1.5A current class within this product lineage. Rochester Electronics serves as an authorized continuing source provider, ensuring these legacy or specialized parts remain available for long-term production needs. The 78M05 variant specifically targets the ubiquitous 5V power rail requirement common in mixed-signal electronics.

Replacement Considerations

Direct pin-compatible replacements include the ON Semiconductor MC78M05CTG, though package differences exist. Verify that any substitute maintains the 1.5A current rating and 5V output tolerance. Check thermal resistance values if switching packages, as heat dissipation may vary between TO-220 and LCC formats. Ensure the replacement supports the required -40°C to 125°C operating temperature range.