onsemi

MC79L12ACDG

MC79L12ACDG Description

The MC79L12ACDG from onsemi is a fixed-output negative linear voltage regulator designed to deliver a stable -12V output with a maximum current of 100mA. Housed in an 8-SOIC surface-mount package, this IC is optimized for compact PCB designs. It operates across a wide temperature range of 0°C to 125°C, making it suitable for industrial and automotive environments. With a dropout voltage of 1.7V (typical at 40mA) and a power supply rejection ratio (PSRR) of 42dB at 120Hz, it ensures reliable performance in noisy power conditions. The device is obsolete but remains relevant for legacy designs due to its robustness and protection features.

MC79L12ACDG Features

• Fixed -12V Output: Ensures consistent voltage regulation without external adjustments.
• High PSRR (42dB): Minimizes output ripple in noisy power environments.
• Protection Mechanisms: Includes over-temperature shutdown and short-circuit protection for enhanced reliability.
• Low Dropout Voltage (1.7V): Efficiently regulates voltage even with small input-output differentials.
• Surface-Mount 8-SOIC Package: Ideal for space-constrained applications.
• Wide Operating Temperature (0°C to 125°C): Suitable for harsh environments.
• 100mA Output Current: Adequate for low-power analog and digital circuits.

MC79L12ACDG Applications

This regulator is ideal for:

• Powering analog circuits such as op-amps and sensors requiring stable negative voltage rails.
• Industrial control systems where consistent voltage is critical despite fluctuating input power.
• Automotive electronics, leveraging its wide temperature tolerance.
• Legacy equipment maintenance, where obsolete components are still in use.
• Portable devices with limited board space, benefiting from its compact SOIC package.

Conclusion of MC79L12ACDG

The MC79L12ACDG is a reliable, albeit obsolete, negative voltage regulator offering high PSRR, robust protection features, and a compact form factor. While newer alternatives exist, its performance in noisy, high-temperature environments makes it a viable choice for legacy designs and specific industrial applications. Engineers seeking a simple, fixed-output solution for low-power negative voltage requirements will find this IC well-suited to their needs.