onsemi

MC78M09CDT

MC78M09CDT Description

The MC78M09CDT from onsemi is a fixed-output linear voltage regulator designed to deliver a stable 9V output with a maximum input voltage of 35V and an output current capability of 500mA. Housed in a DPAK (TO-252) surface-mount package, this obsolete but reliable regulator is suited for applications requiring moderate current regulation with robust thermal and short-circuit protection. Operating within a temperature range of 0°C to 125°C, it features a high PSRR of 80dB at 120Hz, ensuring minimal noise interference in sensitive circuits.

MC78M09CDT Features

• Fixed 9V Output: Ensures consistent voltage regulation without adjustable components.
• High Input Voltage Tolerance (35V): Accommodates fluctuating input conditions.
• 500mA Output Current: Ideal for low-to-moderate power applications.
• Protection Mechanisms: Includes over-temperature and short-circuit protection for enhanced reliability.
• Low Noise Performance: 80dB PSRR at 120Hz reduces ripple in power-sensitive designs.
• Surface-Mount DPAK Package: Compact and suitable for automated PCB assembly.
• Wide Operating Temperature Range (0°C to 125°C): Suitable for industrial environments.

MC78M09CDT Applications

The MC78M09CDT is well-suited for:

• Power Supplies: Stabilizing voltage in 9V DC systems, such as industrial control modules.
• Consumer Electronics: Powering audio amplifiers, small displays, or peripheral devices.
• Automotive Systems: Non-critical voltage regulation in dashboards or infotainment systems (within temperature limits).
• Embedded Systems: Providing clean power to microcontrollers, sensors, and communication modules.
• Test & Measurement Equipment: Ensuring stable voltage references in lab instruments.

Conclusion of MC78M09CDT

While marked as obsolete, the MC78M09CDT remains a dependable choice for designers needing a simple, robust 9V linear regulator with high PSRR and protection features. Its DPAK package and 500mA output make it ideal for space-constrained, moderate-current applications. For legacy systems or cost-sensitive projects, this regulator offers a balance of performance and durability, though modern alternatives may be preferred for new designs.

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