onsemi

MC79M05CDT

MC79M05CDT Description

The MC79M05CDT from onsemi is a fixed-output negative linear voltage regulator designed to deliver a stable -5V output with a 500mA current capacity. Packaged in a DPAK (TO-252) surface-mount form factor, this obsolete but reliable IC is suited for legacy designs requiring robust power regulation. It operates within a wide temperature range of 0°C to 125°C, making it adaptable to harsh environments. With a low dropout voltage of 1.1V (typical at 500mA) and 66dB PSRR (120Hz), it ensures minimal power loss and excellent noise suppression. The device includes over-current and over-temperature protection, enhancing system reliability.

MC79M05CDT Features

• Fixed -5V Output: Precision-regulated negative voltage for consistent performance.
• High Current Capacity: Supports up to 500mA load current, ideal for moderate-power applications.
• Low Dropout Voltage: 1.1V typical at full load, optimizing efficiency.
• High PSRR: 66dB at 120Hz reduces ripple and noise in sensitive circuits.
• Robust Protection: Integrated over-current and over-temperature safeguards.
• Wide Operating Temperature: 0°C to 125°C ensures reliability in demanding conditions.
• Surface-Mount DPAK Package: Compact and suitable for automated PCB assembly.

MC79M05CDT Applications

The MC79M05CDT is ideal for:

• Industrial Control Systems: Powering analog/digital circuits requiring stable negative voltage rails.
• Audio Amplifiers: Providing clean, regulated -5V supplies to op-amps and signal-processing ICs.
• Legacy Electronics: Servicing or replacing obsolete designs where -5V regulation is critical.
• Test & Measurement Equipment: Ensuring low-noise power for precision instrumentation.
• Automotive Electronics: Suitable for non-critical subsystems due to its wide temperature tolerance.

Conclusion of MC79M05CDT

While marked as obsolete, the MC79M05CDT remains a dependable choice for applications demanding a stable -5V supply with robust protection and noise immunity. Its 500mA output, low dropout, and high PSRR make it superior to basic regulators in noise-sensitive environments. Engineers working on legacy systems or cost-sensitive designs will find this regulator a practical solution, though modern alternatives should be evaluated for new projects. Its DPAK package ensures compatibility with space-constrained layouts, reinforcing its utility in industrial and automotive contexts.