L4931CD80-TR

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

The L4931CD80-TR is a fixed-output low-dropout (LDO) linear voltage regulator manufactured by STMicroelectronics. It provides a stable 8.0 V output with a maximum continuous current of 250 mA. The device operates within an input voltage range up to 20 V and maintains regulation across a junction temperature range of -40 °C to +125 °C. Key electrical characteristics include a typical dropout voltage of 0.4 V at full load, a quiescent current of approximately 600 µA in the active state, and a supply voltage rejection ratio (PSRR) of 70 dB for the 5 V version variant. The unit is housed in an 8-pin SOIC surface-mount package.

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

• Integrated logic-controlled electronic shutdown function compatible with TTL levels for standby power management
• Internal protection mechanisms including thermal limiting and current limiting to ensure operational safety
• Requires only a 2.2 µF output capacitor for stability, minimizing external component count and board space

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

• Battery-powered systems requiring low quiescent current operation
• Local voltage regulation in embedded circuits with shutdown requirements
• Low-noise power supply stages for sensitive analog components

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

Verify the obsolete lifecycle status before integration, as availability may be restricted. Confirm that the 8.0 V fixed output aligns with system design requirements, as adjustable variants exist within the family. Ensure the SOIC-8 footprint matches the PCB layout. Check RoHS compliance documentation for specific manufacturing date codes if required for regulatory adherence.

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

Select this component when a fixed 8.0 V rail is necessary with moderate current demands. The low dropout characteristic suits applications where input voltage closely approaches the output level. The shutdown pin allows for system-wide power savings. Consider the thermal performance in the SOIC-8 package under high ambient temperatures or sustained full-load conditions.

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

This part belongs to the L4931 series of very low drop regulators from STMicroelectronics. The series offers multiple output voltages and packages, including SO-8, DPAK, and TO-92. The 'CD' suffix indicates a 2% output voltage accuracy class, while the '-TR' suffix denotes tape-and-reel packaging for automated assembly processes.

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

Direct substitutes within the same manufacturer family include L4931CDxx variants with different fixed output voltages, such as L4931CD50 for 5.0 V or L4931CDT33-TR for 3.3 V, provided the voltage requirement changes. Cross-manufacturer replacements require verification of pin compatibility and electrical specifications.