onsemi

MC7809ACTG

MC7809ACTG Description

The MC7809ACTG from onsemi is a fixed-output positive linear voltage regulator designed to deliver a stable 9V output at up to 1A of continuous current. With an input voltage range extending up to 35V, this regulator is engineered for robustness in demanding applications. Its TO-220AB package ensures efficient heat dissipation, making it suitable for through-hole mounting in industrial and consumer electronics. The device operates across a 0°C to 125°C temperature range, featuring over-temperature and short-circuit protection for enhanced reliability. Although marked as obsolete, it remains a dependable choice for legacy designs due to its ROHS3 compliance and REACH-unaffected status.

MC7809ACTG Features

• High Precision: Fixed 9V output with a low dropout voltage of 2V @ 1A (Typ), ensuring stable performance under load.
• Robust Protection: Integrated over-temperature and short-circuit protection safeguards against fault conditions.
• Low Quiescent Current: 6 mA Iq minimizes power waste in standby modes.
• Excellent Noise Rejection: 61dB PSRR (120Hz) reduces ripple in sensitive circuits.
• Wide Operating Range: Handles input voltages up to 35V and temperatures from 0°C to 125°C.
• Through-Hole Design: TO-220AB package simplifies heat management and mechanical integration.

MC7809ACTG Applications

• Power Supplies: Ideal for 9V rail regulation in industrial control systems, test equipment, and audio amplifiers.
• Embedded Systems: Provides stable voltage to microcontrollers, sensors, and peripheral circuits in legacy designs.
• Automotive Electronics: Suitable for non-critical 12V-to-9V conversion in dashboards or infotainment systems.
• Consumer Electronics: Powers analog circuits, displays, and low-voltage motors in appliances.
• Retrofit Solutions: A reliable drop-in replacement for obsolete 9V regulators in maintenance scenarios.

Conclusion of MC7809ACTG

The MC7809ACTG is a proven linear regulator offering high stability, protection features, and ease of integration. While newer alternatives exist, its wide input range, thermal resilience, and noise immunity make it a pragmatic choice for legacy or cost-sensitive projects. Engineers seeking a simple, no-frills 9V regulator with 1A capability will find this component well-suited for enduring applications. Its obsolete status warrants consideration of modern equivalents for new designs, but it remains a viable option for sustaining existing systems.