L79L15ACUTR

Overview

The L79L15ACUTR is a three-terminal negative voltage regulator from the L79L series, manufactured by STMicroelectronics. It provides a fixed output voltage of -15 V with an output current capability up to 100 mA. The device features thermal overload protection and short-circuit protection, ensuring reliable operation without external components. It operates within a junction temperature range of 0 to 125 °C for the AC grade. The maximum DC input voltage is -35 V. The component is housed in an SOT-89 surface-mount package.

Feature Summary

• Provides fixed -15 V negative regulation with internal current limiting and thermal shutdown
• Delivers up to 100 mA output current suitable for local on-card regulation
• Requires no external components for standard fixed voltage applications

Applications

• Local or on-card negative voltage regulation
• Split power supply systems requiring negative rails
• Replacement for Zener diode/resistor combinations

Procurement Notes

Verify the specific ordering suffix 'UTR' corresponds to the SOT-89 tape and reel packaging configuration as defined in the manufacturer's ordering information table. Confirm that the AC grade designation matches the required +4% output tolerance and commercial operating temperature range (0 to 125 °C) for the intended application environment.

Selection Notes

Select this component when a fixed -15 V negative rail is required with moderate current demands up to 100 mA. The SOT-89 package is appropriate for surface-mount designs where space constraints exist but higher thermal dissipation than TO-92 is needed. Ensure the input voltage does not exceed the -35 V absolute maximum rating.

Part Context

This part belongs to the L79L series of three-terminal negative regulators. The series includes various fixed output voltages such as -5 V, -8 V, -12 V, and -15 V. These regulators are designed to eliminate noise and distribution problems associated with single-point regulation and can be used with power pass elements to create high-current voltage regulators.

Replacement Considerations

Compatible substitutes within the same family include L79L15ABD13TR (SO-8), L79L15ACZ-TR (TO-92 Tape & Reel), and L79L15ACZ-AP (TO-92 Ammopak). Verify package compatibility and thermal resistance differences when substituting between SOT-89, SO-8, and TO-92 formats.