L79L05ABUTR

Overview

The L79L05ABUTR is a three-terminal negative linear voltage regulator from the L79L series, manufactured by STMicroelectronics. It provides a fixed output voltage of -5 V with a maximum output current capability of 100 mA. The device operates within an extended junction temperature range of -40 °C to +125 °C and features internal thermal overload protection and short-circuit limiting. It utilizes a SOT-89 surface-mount package.

Feature Summary

• Internal thermal overload protection
• Short-circuit protection
• No external components required

Applications

• Local or on-card regulation for elimination of noise
• Distribution problems associated with single-point regulation
• Zener diode/resistor combination replacement

Procurement Notes

Verify that the specific part number matches the required tolerance grade and package type. Confirm the ordering suffix corresponds to the correct packaging format. Ensure compatibility with the intended operating temperature range and input voltage constraints before procurement.

Selection Notes

Select this component when a fixed negative voltage rail is required in compact designs. Consider the SOT-89 package for surface-mount applications requiring moderate power dissipation capabilities. Evaluate thermal resistance requirements based on the expected load current and ambient conditions.

Part Context

This component belongs to the L79L series of three-terminal negative regulators. The series includes variants with different output voltages (-5, -8, -12, -15 V) and tolerance grades (AC for ±5%, C for ±10%). The AB designation indicates the extended industrial temperature range availability.

Replacement Considerations

Compatible substitutes include other L79LxxAB variants with different output voltages or the L79LxxAC series for commercial temperature ranges. Verify pinout compatibility and thermal performance characteristics when substituting.