onsemi

MC78M05BT

MC78M05BT Description

The MC78M05BT from onsemi is a fixed-output linear voltage regulator designed to deliver a stable 5V DC output with a maximum input voltage of 35V and an output current capability of 500mA. Housed in a TO-220AB package, this through-hole-mount regulator is part of the 78Mxx series, offering reliable voltage regulation for a wide range of electronic applications. Although marked as obsolete, it remains a robust choice for legacy designs due to its proven performance and REACH compliance.

MC78M05BT Features

• Fixed 5V Output: Ensures consistent voltage regulation for low-power circuits.
• High Input Voltage Tolerance (35V): Suitable for applications with fluctuating input voltages.
• 500mA Output Current: Adequate for powering small to medium loads.
• Built-in Protection: Includes over-temperature and short-circuit safeguards for enhanced reliability.
• Low Noise & High PSRR (80dB at 120Hz): Minimizes ripple, making it ideal for noise-sensitive analog/digital systems.
• MSL 1 (Unlimited): No moisture sensitivity concerns during storage or assembly.

MC78M05BT Applications

This regulator excels in scenarios requiring stable 5V power, such as:

• Embedded Systems: Powering microcontrollers (e.g., Arduino, 8051) and peripheral ICs.
• Industrial Controls: Voltage stabilization for sensors, relays, and PLC modules.
• Consumer Electronics: Used in audio amplifiers, LED drivers, and small power supplies.
• Legacy Equipment Maintenance: Replacing older 78M05 variants in repairs or upgrades.

Conclusion of MC78M05BT

The MC78M05BT is a dependable, albeit obsolete, linear regulator offering simplicity, durability, and noise immunity for 5V applications. Its high PSRR and protection features make it superior to basic LDOs in noisy environments. While newer alternatives exist, its through-hole design and proven performance ensure continued relevance in prototyping, industrial systems, and legacy hardware. Engineers seeking a cost-effective, medium-current regulator with robust safeguards will find this IC a pragmatic choice.