L78L12ACD

Overview

The L78L12ACD is a three-terminal positive linear voltage regulator from the STMicroelectronics L78L series, housed in an 8-SOIC surface-mount package. It provides a fixed output voltage of 12 V with a maximum output current of 100 mA. The device supports a DC input voltage up to 35 V and operates within a junction temperature range of 0°C to 125°C. It features internal current limiting and thermal shutdown protection.

Feature Summary

• Integrated short-circuit and thermal overload protection for robust operation
• Requires no external components for basic regulation functionality
• Designed for local or on-card voltage regulation applications

Applications

• Local or on-card voltage regulation
• Replacement for Zener diode/resistor combinations
• General-purpose fixed voltage regulation

Procurement Notes

Verify the specific suffix 'D' corresponds to the SO-8 package configuration required for your design. Confirm that the AC tolerance variant meets your circuit's voltage accuracy requirements. Ensure adequate copper area on the PCB is allocated for heat dissipation given the package's thermal characteristics.

Selection Notes

Select this component when a compact surface-mount solution is needed for low-current 12V regulation. The SO-8 package offers higher power dissipation capability compared to through-hole alternatives due to internal pin commutation. Verify input voltage ranges do not exceed the 35 V absolute maximum rating under all operating conditions.

Part Context

This part belongs to the L78L series of three-terminal positive regulators. Unlike the higher-current L78 series, the L78L series is optimized for lower output currents up to 100 mA. The 'AC' designation indicates a ±4% output voltage tolerance, providing tighter regulation than the standard 'C' variant.

Replacement Considerations

LM78L12ACZ/LFT3