onsemi

MC79M12CDT

MC79M12CDT Description

The MC79M12CDT from onsemi is a fixed-output negative linear voltage regulator designed to deliver a stable -12V output with a maximum current capacity of 500mA. Housed in a DPAK (TO-252) surface-mount package, this obsolete but reliable component is suited for applications requiring robust voltage regulation in a compact form factor. With a low dropout voltage of 1.1V (typical at 500mA) and an operating temperature range of 0°C to 125°C, it ensures consistent performance under varying load and environmental conditions. The device features over-current and over-temperature protection, enhancing system reliability in demanding scenarios.

MC79M12CDT Features

• Fixed Negative Output: Delivers a precise -12V output, ideal for dual-supply systems.
• High PSRR (60dB at 120Hz): Minimizes noise and ripple, ensuring clean power delivery.
• Low Dropout Voltage: 1.1V typical at full load, improving efficiency in low-input-voltage applications.
• Robust Protection: Includes over-current and over-temperature safeguards to prevent damage.
• Wide Operating Temperature: Functions reliably from 0°C to 125°C, suitable for industrial environments.
• Surface-Mount DPAK Package: Optimizes board space while facilitating efficient heat dissipation.

MC79M12CDT Applications

The MC79M12CDT is particularly well-suited for:

• Industrial Control Systems: Where stable negative voltage rails are critical for analog circuitry.
• Audio Amplifiers: Providing clean, regulated power to op-amps and signal-processing stages.
• Test and Measurement Equipment: Ensuring precision in sensitive instrumentation.
• Legacy Electronics: Serving as a drop-in replacement for obsolete designs requiring -12V regulation.
• Power Supply Modules: Complementing positive regulators in dual-rail configurations.

Conclusion of MC79M12CDT

While marked as obsolete, the MC79M12CDT remains a dependable choice for applications demanding a high-performance, negative-voltage regulator. Its combination of low dropout, high PSRR, and built-in protections makes it a robust solution for industrial, audio, and instrumentation designs. Engineers working with legacy systems or requiring a compact, surface-mount regulator will find this device particularly valuable. For new designs, verifying alternative modern equivalents from onsemi is recommended.