L78L33ACZ-AP

Overview

The L78L33ACZ-AP is a three-terminal positive linear voltage regulator from the STMicroelectronics L78L series, housed in a TO-92-3 package. It provides a fixed output voltage of 3.3 V with a maximum output current of 100 mA. The device supports an input voltage range up to 30 V and operates within a junction temperature range of 0 °C to 125 °C. Electrical characteristics include a typical quiescent current of 6 mA at 25 °C, line regulation of 150 mV, and load regulation of 60 mV. The component incorporates internal thermal overload protection and short-circuit protection.

Feature Summary

• Integrates internal current limiting and thermal shutdown mechanisms for robust operation under fault conditions.
• Provides fixed voltage regulation without requiring external components for basic functionality.
• Offers improved performance over Zener diode/resistor combinations with lower quiescent current and reduced noise.

Applications

• Local or on-card voltage regulation to eliminate noise associated with single-point distribution.
• Replacement for Zener diode and resistor combinations in low-current power supply circuits.
• Configuration with external power pass elements to achieve high-current voltage regulation requirements.

Procurement Notes

Verify that the ordering suffix 'Z-AP' corresponds to the specific tape-and-reel packaging configuration required for automated assembly processes. Confirm compliance with RoHS3 directives and REACH regulations prior to integration. Ensure the selected package variant matches the intended PCB footprint and thermal management strategy for the application environment.

Selection Notes

Select this component when a fixed 3.3 V output is required with moderate current demands up to 100 mA. The AC designation indicates a ±4% output voltage tolerance, suitable for applications needing tighter regulation than standard C-grade parts. Consider the TO-92 package constraints regarding thermal dissipation and ensure adequate copper area on the printed circuit board for heat sinking if operating near maximum current limits.

Part Context

This device belongs to the L78L series of three-terminal positive regulators manufactured by STMicroelectronics. The series is designed for general-purpose linear regulation tasks where simplicity and reliability are prioritized. The L78L family offers various fixed output voltages and is available in multiple package options including TO-92, SO-8, and SOT-89 to accommodate different spatial and thermal design requirements.

Replacement Considerations

• L78L33ACZTR