AN79L18

Overview

The Panasonic AN79L18 is a monolithic, fixed negative output voltage regulator providing -18V at up to 100mA. It requires no external components for basic operation and features built-in overcurrent limiting and thermal overload protection. The device operates with an input voltage range of -21V to -33V and maintains stability across a junction temperature range of 0°C to 125°C.

Feature Summary

• Integrated overcurrent limit circuit protects against short circuits
• Built-in thermal overload protection prevents damage from overheating
• Fixed negative output voltage eliminates need for external adjustment components

Applications

• Power supply circuits requiring stable negative voltage rails
• General electronic equipment power management
• Communications equipment biasing

Procurement Notes

Verify the specific package variant (AN79Lxx or AN79LxxM) as pinouts differ between SSIP and HSIP configurations. Confirm lead-free status if required, noting that newer packages utilize SSIP003-P-0000S and HSIP003-P-0000Q designations. Ensure input/output capacitor values match datasheet recommendations to prevent oscillation.

Selection Notes

Select this component when a fixed -18V negative rail is needed with low current demands. Verify that the input voltage remains within the specified -21V to -33V window. Consider the thermal dissipation characteristics if operating near maximum load currents or high ambient temperatures.

Part Context

Part of the AN79Lxx series family of three-terminal negative regulators. The series includes various fixed voltage options ranging from -4V to -24V. The AN79L18 specifically targets applications requiring an -18V supply in compact through-hole packages.

Replacement Considerations

Check pinout compatibility carefully. The AN79LxxM series uses a different pin configuration than the standard AN79Lxx series. Direct substitutes must match both the electrical specifications and the physical package pin assignments.