onsemi

MC78M09BDTG

MC78M09BDTG Description

The MC78M09BDTG is a fixed-output linear voltage regulator from onsemi, designed to deliver a stable 9V output at up to 500mA of continuous current. With an input voltage range extending up to 35V, this regulator is well-suited for applications requiring reliable voltage conversion from higher input sources. Housed in a DPAK (TO-252) surface-mount package, it offers efficient thermal dissipation and is ideal for space-constrained designs. The device features over-temperature and short-circuit protection, ensuring robust operation under adverse conditions. While marked as obsolete, it remains a viable choice for legacy systems due to its proven performance and compliance with RoHS3 and REACH standards.

MC78M09BDTG Features

• Fixed 9V Output: Ensures precise voltage regulation without external adjustments.
• High Input Voltage Tolerance (35V Max): Accommodates a wide range of input sources.
• 500mA Output Current: Suitable for moderate-power applications.
• 80dB PSRR (120Hz): Excellent noise rejection for clean output in sensitive circuits.
• Protection Mechanisms: Includes over-temperature and short-circuit safeguards.
• Surface-Mount DPAK Package: Optimized for thermal performance and PCB space efficiency.
• RoHS3 Compliant & REACH Unaffected: Meets environmental and regulatory standards.

MC78M09BDTG Applications

The MC78M09BDTG is ideal for systems 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 displays.
• Automotive Electronics: Auxiliary power for infotainment or lighting systems (non-critical).
• Legacy Equipment: Maintenance and repair of older devices where modern alternatives may not be compatible.

Conclusion of MC78M09BDTG

The MC78M09BDTG is a dependable linear voltage regulator offering a balance of performance, protection, and ease of integration. Its high PSRR, robust protection features, and DPAK packaging make it a practical choice for applications demanding stable 9V power. While obsolete, its proven reliability ensures continued relevance in legacy and cost-sensitive designs. Engineers should evaluate alternative modern regulators for new projects but can rely on this device for existing systems requiring a trusted solution.