onsemi

MC78T05ACT

MC78T05ACT Description

The MC78T05ACT from onsemi is a robust 3A fixed 5V linear voltage regulator in a TO-220AB package, designed for high-current applications requiring stable voltage regulation. With an input voltage range up to 35V, it delivers a fixed 5V output with a low dropout voltage of 2.5V at 3A, ensuring efficient power conversion even under heavy loads. The regulator features over-current and over-temperature protection, enhancing reliability in demanding environments. Its 75dB PSRR (120Hz) minimizes noise, making it suitable for sensitive analog and digital circuits. Though marked as obsolete, its performance remains competitive for legacy designs.

MC78T05ACT Features

• High Output Current: Supports 3A continuous load, ideal for power-hungry applications.
• Wide Input Range: Operates up to 35V, accommodating fluctuating input sources.
• Low Dropout Voltage: 2.5V dropout at 3A ensures stable output under high current.
• Built-in Protections: Over-current and over-temperature shutdown safeguard against faults.
• Excellent Noise Rejection: 75dB PSRR at 120Hz reduces ripple in sensitive circuits.
• Thermal Performance: TO-220AB package enables efficient heat dissipation for 0°C to 125°C operation.
• Low Quiescent Current: 5mA Iq minimizes power waste in standby modes.

MC78T05ACT Applications

This regulator excels in systems requiring high-current, low-noise 5V rails, such as:

• Industrial Controls: Powering PLCs, motor drivers, and sensors.
• Automotive Electronics: Voltage stabilization for infotainment and ECUs (within temp limits).
• Embedded Systems: Reliable supply for microcontrollers, FPGAs, and peripherals.
• Test Equipment: Precision analog/digital circuits benefiting from low ripple.
• Legacy Designs: Cost-effective replacement for obsolete 3A linear regulators.

Conclusion of MC78T05ACT

The MC78T05ACT is a dependable, high-current linear regulator offering stable 5V output, robust protections, and low noise—ideal for industrial, automotive, and embedded applications. While obsolete, its 3A capability, wide input range, and thermal resilience make it a pragmatic choice for designs prioritizing durability over cutting-edge efficiency. Engineers seeking a proven TO-220 solution for moderate-power regulation will find this IC a compelling option.