LE55CZ

Overview

The LE55CZ is a fixed-output linear voltage regulator from STMicroelectronics, providing a stable 5.5 V output with a maximum current capacity of 100 mA. It operates within an input voltage range up to 18 V and features a typical dropout voltage of 0.2 V. The device incorporates internal protection mechanisms against over-current and over-temperature conditions. Packaged in a TO-92-3 through-hole configuration, it is designed for applications requiring low quiescent current and efficient power management in compact electronic systems.

Feature Summary

• Very low dropout voltage performance for efficient operation near input limits
• Integrated thermal and current limiting protection for enhanced reliability
• Low quiescent current consumption suitable for battery-powered devices

Applications

• Portable consumer electronics requiring stable 5.5 V logic supplies
• Battery-operated systems with limited headroom between source and load
• Embedded control circuits needing protected linear regulation

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status as regulatory requirements vary by region and production batch. Check part status carefully, as this model may be obsolete; ensure availability of qualified alternatives if long-term supply continuity is required for your specific application timeline.

Selection Notes

Select this regulator when a precise 5.5 V fixed output is necessary with minimal voltage drop across the device. Consider its 100 mA limit for load requirements and verify that the TO-92-3 package fits your board layout constraints. Evaluate thermal dissipation needs based on the difference between input voltage and the 5.5 V output under maximum load conditions.

Part Context

This component belongs to STMicroelectronics' LExxC series of very low dropout linear regulators with inhibit functionality. These devices are engineered for general-purpose power management where efficiency and size are critical. The series typically offers various fixed output voltages to accommodate different digital logic families and sensor requirements in compact embedded designs.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. As the LE55CZ is listed as obsolete, engineers should consult official replacement guides or contact STMicroelectronics directly for validated cross-reference components that match the electrical specifications and pinout configuration.