onsemi MC79L05ABPG: Fixed -5V Linear Voltage Regulator Technical Overview

The onsemi MC79L05ABPG is a fixed-output, negative voltage linear regulator belonging to the popular 79L series. This device is engineered to deliver a stable -5V output with a maximum current of 100mA. It is designed to complement positive regulators like the 78L05, providing a complete power supply solution for analog and digital circuits requiring a negative bias voltage.

Housed in a compact TO-92 package, the MC79L05ABPG is ideal for space-constrained applications. Its fundamental operation involves dissipating excess power as heat to maintain a constant output voltage, despite variations in input voltage or load current. To ensure stable operation, the device requires input and output capacitors, typically 0.1µF to 1µF, placed close to the regulator's pins to suppress oscillation and improve transient response.

A key feature of this component is its internal current limiting and thermal shutdown protection. The current limiting circuit safeguards the regulator and the load from damage during overload conditions, while the thermal shutdown mechanism turns off the device if the junction temperature exceeds a safe limit, reactivating only when it has cooled sufficiently.

The "AB" suffix in the part number denotes onsemi's specific version with assured operational characteristics. Typical applications include its use as a bias voltage source for operational amplifiers in audio pre-amps, sensor interfaces, and other analog systems. It is also commonly found in the power supply sections of various consumer electronics, industrial controls, and instrumentation equipment where a low-current, negative voltage rail is essential.

ICGOOODFIND: The onsemi MC79L05ABPG is a highly reliable, cost-effective solution for generating a precise -5V supply. Its built-in protection features, simple implementation, and compact form factor make it an excellent choice for low-power, negative voltage requirements across a wide range of electronic designs.

Keywords: Negative Voltage Regulator, -5V Output, Thermal Shutdown, TO-92 Package, Onsemi