onsemi

MC7805ACT

MC7805ACT Description

The MC7805ACT from onsemi is a fixed-output positive linear voltage regulator delivering a stable 5V output at up to 1A current. Designed for through-hole mounting (TO-220AB package), it accepts input voltages up to 35V and features a typical dropout voltage of 2V @ 1A, ensuring reliable performance under load. With a quiescent current of 6 mA and 83dB PSRR (120Hz), it excels in noise-sensitive applications. The regulator includes over-temperature and short-circuit protection, enhancing system durability. Though marked obsolete, its robustness and simplicity make it a legacy choice for basic power regulation.

MC7805ACT Features

• Fixed 5V Output: Precision-regulated voltage for stable power delivery.
• High Input Voltage Tolerance (35V): Suitable for varied input sources.
• 1A Output Current: Supports moderate power loads.
• Low Dropout (2V @ 1A): Efficient operation close to the output voltage.
• Protection Mechanisms: Over-temperature and short-circuit safeguards.
• High PSRR (83dB): Superior noise rejection for sensitive circuits.
• Wide Temperature Range (0°C to 125°C): Reliable in harsh environments.
• Through-Hole Package (TO-220AB): Easy to integrate into legacy designs.

MC7805ACT Applications

Ideal for low-to-medium power linear regulation, the MC7805ACT is commonly used in:

• Embedded Systems: Powering microcontrollers, sensors, and logic circuits.
• Consumer Electronics: Voltage stabilization in audio/video equipment.
• Industrial Controls: Reliable supply for PLCs and motor drivers.
• Automotive Electronics: Auxiliary power in non-critical automotive systems.
• Legacy Equipment: Cost-effective replacement in maintenance scenarios.

Conclusion of MC7805ACT

The MC7805ACT remains a dependable linear regulator for 5V power applications, offering a balance of simplicity, protection, and noise immunity. While newer alternatives exist, its proven performance in industrial, automotive, and consumer electronics ensures continued relevance in legacy and cost-sensitive designs. Engineers value its ruggedness and ease of integration, making it a pragmatic choice despite its obsolete status.