onsemi

MC79L05ACP

MC79L05ACP Description

The MC79L05ACP from onsemi is a fixed-output negative linear voltage regulator designed to deliver a stable -5V output with a maximum current capacity of 100mA. Housed in a compact TO-92-3 package, this obsolete but reliable component is suited for through-hole mounting and operates across a wide temperature range of 0°C to 125°C. With a quiescent current of 5.5mA and a supply current of up to 6mA, it balances efficiency with performance. The device features over-temperature and short-circuit protection, ensuring robustness in demanding environments. Its 60dB PSRR (120Hz) minimizes noise, making it ideal for sensitive analog circuits.

MC79L05ACP Features

• Fixed Negative Output: Delivers a precise -5V with tight regulation.
• High PSRR (60dB): Excellent noise suppression for clean power delivery.
• Protection Mechanisms: Built-in thermal shutdown and short-circuit protection enhance reliability.
• Wide Operating Temperature: Performs reliably from 0°C to 125°C, suitable for industrial applications.
• Low Quiescent Current (5.5mA): Optimizes power efficiency in battery-operated systems.
• Through-Hole Package (TO-92-3): Easy to integrate into legacy or prototype designs.

MC79L05ACP Applications

The MC79L05ACP is ideal for:

• Analog Signal Conditioning: Providing stable negative bias for op-amps and sensors.
• Industrial Control Systems: Powering low-current negative rail requirements in PLCs and instrumentation.
• Consumer Electronics: Used in audio amplifiers and legacy devices requiring -5V rails.
• Test & Measurement Equipment: Ensures consistent voltage references in precision circuits.
• Battery-Powered Devices: Its low Iq makes it suitable for portable electronics with dual-rail needs.

Conclusion of MC79L05ACP

While marked as obsolete, the MC79L05ACP remains a dependable choice for applications requiring a low-current, negative voltage regulator with robust protection features. Its high PSRR, thermal resilience, and compact form factor make it particularly valuable in analog and industrial systems where noise immunity and reliability are critical. Engineers working with legacy designs or cost-sensitive projects may find this regulator a practical solution despite newer alternatives.