onsemi

MC78M09CDTRK

MC78M09CDTRK Description

The MC78M09CDTRK from onsemi is a fixed-output linear voltage regulator designed to deliver a stable 9V output at up to 500mA of continuous current. Housed in a DPAK (TO-252) surface-mount package, this regulator accepts an input voltage range up to 35V, making it suitable for a variety of industrial and consumer applications. With a PSRR (Power Supply Rejection Ratio) of 80dB at 120Hz, it effectively filters input noise, ensuring clean power delivery. The device operates within a temperature range of 0°C to 125°C and includes over-temperature and short-circuit protection, enhancing reliability in demanding environments. Although marked as obsolete, it remains a robust choice for legacy designs requiring dependable voltage regulation.

MC78M09CDTRK Features

• Fixed 9V Output: Ensures consistent voltage regulation without external adjustments.
• High Input Voltage Tolerance (35V Max): Accommodates wide input variations.
• 500mA Output Current: Suitable for moderate-power applications.
• 80dB PSRR at 120Hz: Superior noise suppression for sensitive circuits.
• Built-in Protections: Over-temperature and short-circuit safeguards enhance durability.
• Surface-Mount DPAK Package: Compact and efficient for PCB integration.
• Wide Operating Temperature (0°C to 125°C): Reliable performance in harsh conditions.

MC78M09CDTRK Applications

This regulator is ideal for systems requiring a stable 9V supply, including:

• Industrial Control Systems: Powering sensors, actuators, and control logic.
• Consumer Electronics: Voltage regulation in audio amplifiers, set-top boxes, and small appliances.
• Automotive Accessories: Non-critical circuits where robust voltage regulation is needed.
• Legacy Equipment Maintenance: Replacing older 9V regulators in existing designs.
• Embedded Systems: Providing clean power to microcontrollers and peripherals.

Conclusion of MC78M09CDTRK

The MC78M09CDTRK is a dependable linear voltage regulator offering high noise rejection, thermal protection, and a wide input voltage range. While obsolete, its rugged design and consistent performance make it a viable option for legacy or cost-sensitive applications. Engineers seeking a simple, no-frills 9V regulator with proven reliability will find this component well-suited for moderate-power systems. For new designs, however, modern alternatives with improved efficiency (e.g., LDOs or switching regulators) may be preferable.