onsemi

MC7809BTG

MC7809BTG Description

The MC7809BTG from onsemi is a fixed-output linear voltage regulator designed to deliver a stable 9V output at up to 1A current. As part of the 7800 series, it features a positive output configuration and operates with an input voltage range up to 35V, making it suitable for a variety of power supply designs. The device is housed in a TO-220AB package, ensuring robust thermal performance and ease of mounting in through-hole applications. With over-temperature and short-circuit protection, it offers reliable operation under demanding conditions.

MC7809BTG Features

• Fixed 9V Output: Ensures precise voltage regulation without external adjustments.
• High Input Voltage Tolerance (35V): Accommodates wide input variations.
• Low Dropout Voltage (2V @ 1A): Maintains efficiency even under high load.
• 1A Output Current: Suitable for powering medium-current circuits.
• Built-in Protections: Includes over-temperature and short-circuit safeguards.
• Low Quiescent Current (8 mA): Minimizes power loss in standby mode.
• High PSRR (61dB @ 120Hz): Effectively suppresses input ripple for clean output.
• RoHS3 & REACH Compliant: Meets environmental and safety standards.

MC7809BTG Applications

The MC7809BTG is ideal for applications requiring a stable 9V supply, such as:

• Industrial Control Systems: Powering sensors, actuators, and control logic.
• Consumer Electronics: Voltage regulation in audio amplifiers, set-top boxes, and small appliances.
• Automotive Electronics: Auxiliary power for infotainment or dashboard systems (non-critical).
• Embedded Systems: Reliable voltage source for microcontrollers and peripherals.
• Test & Measurement Equipment: Providing clean power to precision circuits.

Conclusion of MC7809BTG

The MC7809BTG is a dependable linear regulator offering simplicity, robustness, and efficiency for 9V power applications. Its high input tolerance, built-in protections, and low dropout make it superior to basic regulators, while its TO-220AB package ensures easy integration. Though marked obsolete, it remains a viable choice for legacy designs or applications where proven reliability is critical. For modern designs, consider checking onsemi's latest alternatives with enhanced features.