L4931CD33-TR

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The L4931CD33-TR is a fixed-output low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a stable 3.3 V output with a maximum continuous current of 250 mA. The device operates within an input voltage range of 4 V to 20 V and features a typical dropout voltage of 400 mV at full load, with a maximum specified dropout of 800 mV. Quiescent current is typically 600 µA in the ON state. The component is housed in an SOIC-8 surface-mount package and supports operation across an extended temperature range from -40 °C to +125 °C.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Integrated electronic shutdown logic control for power management
• Internal protection against overcurrent and thermal overload
• Requires only a 2.2 µF output capacitor for stability

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Battery-powered portable systems
• Low noise power supply circuits
• Local voltage regulation on printed circuit boards

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific suffix 'CD33' confirms the 3.3 V fixed output and 'C' indicates the 2% accuracy grade. Confirm the '-TR' suffix denotes tape-and-reel packaging compatible with automated assembly equipment. Ensure the SOIC-8 package footprint matches the target PCB design constraints before finalizing procurement orders.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when a fixed 3.3 V rail is required with moderate current capability up to 250 mA. The low quiescent current makes it suitable for battery-operated devices where standby consumption must be minimized. Verify that the input voltage remains within the 4 V to 20 V window to ensure proper regulation and prevent damage.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This part belongs to the L4931 family of very low drop regulators available in multiple packages including SO-8, DPAK, and TO-92. The family offers various fixed output voltages and accuracy grades. The L4931 series is designed for applications requiring high supply voltage rejection and minimal external components, supporting both automotive and industrial environments.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

L4931CD50-TR: Provides 5.0 V output instead of 3.3 V; verify voltage requirement compatibility.