onsemi

MC78M09CDTG

MC78M09CDTG Description

The MC78M09CDTG 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 suitable for a variety of power supply applications requiring moderate current handling. Housed in a DPAK (TO-252) surface-mount package, it offers robust thermal performance and ease of integration into PCB designs. Although marked as obsolete, it remains a reliable choice for legacy systems or designs where proven performance is prioritized. The device operates across a temperature range of 0°C to 125°C, ensuring stability in demanding environments.

MC78M09CDTG Features

• Fixed 9V Output: Ensures precise voltage regulation without external adjustments.
• High Input Voltage Tolerance (35V Max): Accommodates wide input variations, ideal for unregulated power sources.
• 500mA Output Current: Sufficient for powering small to medium loads, such as sensors or low-power ICs.
• Protection Mechanisms: Includes over-temperature and short-circuit protection, enhancing system reliability.
• Low Noise & High PSRR (80dB at 120Hz): Minimizes ripple, making it suitable for noise-sensitive analog circuits.
• RoHS3 Compliant & REACH Unaffected: Meets environmental and regulatory standards.
• Surface-Mount DPAK Package: Optimizes board space and thermal dissipation.

MC78M09CDTG Applications

This regulator is well-suited for:

• Industrial Control Systems: Providing stable voltage to microcontrollers, PLCs, or sensor modules.
• Consumer Electronics: Powering audio amplifiers, set-top boxes, or legacy devices.
• Automotive Electronics: Auxiliary power for infotainment or dashboard systems (within operating temperature limits).
• Telecom Equipment: Voltage stabilization in low-power communication modules.
• Embedded Systems: Reliable power for prototyping or educational kits.

Conclusion of MC78M09CDTG

The MC78M09CDTG is a dependable linear regulator offering a balance of simplicity, robustness, and performance. While obsolete, its high PSRR, protection features, and wide input range make it a pragmatic choice for legacy designs or applications requiring a proven 9V rail. Engineers valuing thermal resilience and compact packaging may find it particularly useful, though newer alternatives should be evaluated for forward-looking projects.