L4931CDT33-TR

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

The L4931CDT33-TR is a positive fixed-output low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a stable 3.3 V output with a maximum continuous current capability 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. Quiescent current consumption is specified at 600 µA in the active state, supporting efficient power management in battery-operated systems. The component is housed in an SOIC-8 surface-mount package and is rated for operation across an extended industrial temperature range from -40 °C to +125 °C.

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

• Integrated TTL-compatible shutdown logic control function allows for electronic standby mode activation to reduce total system power consumption.
• Requires only a 2.2 µF output capacitor for stability, minimizing external component count and board space requirements.
• Includes internal protection mechanisms against overcurrent conditions and excessive thermal stress to ensure operational reliability.

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

• Battery-powered portable electronic devices requiring low quiescent current
• Local voltage regulation for specific circuit sections via shutdown control
• Low-noise power supply applications in consumer electronics

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

Verify the exact suffix configuration against the manufacturer's official datasheet to confirm pinout compatibility and electrical specifications. Ensure the selected variant matches the required output voltage tolerance and package type for your specific PCB layout constraints. Cross-reference ordering codes with authorized distributors to avoid counterfeit components.

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

Select this regulator when a fixed 3.3 V output is required with moderate current demands up to 250 mA. The inclusion of a shutdown pin makes it suitable for designs needing power-saving standby modes. Consider the SOIC-8 package dimensions and thermal dissipation capabilities relative to the ambient operating environment and expected load currents.

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

This component belongs to the L4931 series of very low drop voltage regulators. The series offers various output voltages and packages, including DPAK and TO-92. The 'CD' designation typically indicates a specific output voltage tolerance and package style within the family, while 'TR' denotes tape and reel packaging for automated assembly processes.

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

Compatible substitutes include other variants within the L4931 family such as L4931CD50-TR for different voltage outputs or L4931ABxx series for tighter tolerance requirements. Verify that any replacement maintains the same SOIC-8 footprint and electrical characteristics to ensure direct interchangeability without redesigning the surrounding circuitry.