LE33CZ-AP

Overview

The LE33CZ-AP is a positive linear voltage regulator from the STMicroelectronics LE series, providing a fixed 3.3 V output with a maximum current of 100 mA. It operates within an input voltage range of 5 V to 26 V and features a low dropout voltage of 200 mV at full load. The device incorporates internal thermal overload protection and current limiting for robust operation. It is housed in a TO-92-3 through-hole package and supports an operating temperature range from -40 °C to +125 °C.

Feature Summary

• Low dropout performance enabling efficient regulation with minimal input-output differential
• Integrated thermal shutdown and current limiting safeguards against overheating and short circuits
• Fixed 3.3 V output ensures stable power delivery without external feedback components

Applications

• Power supply stages for battery-operated portable devices
• Voltage regulation for microcontroller logic interfaces
• Pre-regulation for low-dropout regulator (LDO) cascaded configurations

Procurement Notes

Verify the specific suffix 'AP' against the official datasheet to confirm it denotes the standard commercial grade variant rather than a specialized industrial or automotive qualification. Ensure the ordering part number matches the exact pinout and package tolerance requirements for your PCB footprint. Cross-reference the manufacturer's latest documentation to confirm RoHS compliance status and any recent design changes.

Selection Notes

Select this component when a simple, cost-effective solution is required for moderate current loads up to 100 mA. It is suitable for applications where the input voltage remains close to the output level, leveraging its low dropout characteristic. Consider the thermal dissipation capabilities of the TO-92 package under expected ambient conditions and load currents to ensure reliable long-term operation.

Part Context

This regulator belongs to the LE series, designed as a successor to older L78Lxx devices with improved dropout performance. It serves as a fundamental building block in power management integrated circuits (PMIC) for general-purpose electronics. The TO-92-3 package offers a compact form factor suitable for space-constrained through-hole designs.

Replacement Considerations

Direct substitutes include the L78L33ACZ-AP and LE33CZ-TR, which share identical electrical specifications and pinouts. Verify that alternative manufacturers' equivalents maintain the same 100 mA current rating and 3.3 V fixed output tolerance.