L78L12ABUTR

Overview

The L78L12ABUTR is a three-terminal positive linear voltage regulator from the STMicroelectronics L78L series, housed in an SOT-89 surface-mount package. It provides a fixed 12 V output with a maximum continuous current of 100 mA. The device supports a maximum DC input voltage of 35 V and operates within a junction temperature range of -40 °C to +125 °C. Electrical characteristics include a typical quiescent current of 6.5 mA at 25 °C, line regulation of 200 mV (VI = 16 to 27 V), and load regulation of 100 mV (IO = 1 to 100 mA).

Feature Summary

• Internal current limiting and thermal shutdown mechanisms provide inherent protection against overload conditions.
• Designed for local or on-card regulation to eliminate noise and distribution issues associated with single-point regulation.
• Capable of replacing Zener diode and resistor combinations while offering lower quiescent current and reduced noise.

Applications

• Local or on-card voltage regulation in electronic circuits.
• Industrial sensor module power supply systems.
• Replacement for discrete Zener diode and resistor voltage reference combinations.

Procurement Notes

Verify that the ordering suffix 'TR' corresponds to the tape-and-reel packaging format required for automated assembly processes. Confirm that the 'A' designation matches the ±4% output voltage tolerance specification. Ensure the component grade aligns with the required operating temperature range of -40 °C to +125 °C before finalizing procurement specifications.

Selection Notes

Select this component when a fixed 12 V output is required with a maximum load current of 100 mA. The SOT-89 package is suitable for surface-mount applications where space constraints exist. Verify that the input voltage does not exceed 35 V and that the thermal design accommodates the internal power dissipation limits under maximum load conditions.

Part Context

This part belongs to the L78L series of three-terminal positive regulators manufactured by STMicroelectronics. The series includes various fixed output voltages ranging from 3.3 V to 24 V. The L78L12 variant specifically targets applications requiring a stable 12 V rail. The 'AB' suffix indicates extended temperature capability compared to standard variants.

Replacement Considerations

Compatible replacements within the same family include L78L12ACUTR, which offers identical electrical performance but with a ±8% output voltage tolerance instead of ±4%. Both parts share the same pinout and physical dimensions, allowing for direct substitution in existing designs provided the tolerance requirements are met.