LD1117V25

Overview

The LD1117V25 is a fixed positive low-dropout voltage regulator manufactured by STMicroelectronics. It provides a fixed output voltage of 2.5 V with a maximum output current of 800 mA. The device operates within an input voltage range of 3.3 V to 15 V and features a typical dropout voltage of 1 V at full load. It includes internal thermal overload protection and current limiting. The component is housed in a TO-220 package, suitable for surface mount or through-hole installation depending on the specific variant suffix, and supports operating temperatures from -40°C to +125°C.

Feature Summary

• Fixed 2.5 V output voltage regulation
• High current capability up to 800 mA
• Low dropout voltage operation
• Internal thermal and current protection

Applications

• Battery-powered systems requiring stable 2.5 V rails
• Post-regulation for switching power supplies
• Portable equipment power management

Procurement Notes

Verify the exact package type (TO-220 vs TO-263) as the base part number may correspond to multiple physical packages. Confirm RoHS compliance status and lead times with authorized distributors. Check for obsolete status indicators as this component may be phased out in favor of newer series.

Selection Notes

Select this component when a fixed 2.5 V output is required with moderate current demands. Ensure the input voltage remains within the 3.3 V to 15 V range. Consider thermal dissipation requirements given the 12 W max power dissipation rating in appropriate packages.

Part Context

Part of the LD1117 family of low-dropout regulators. This specific model offers a fixed 2.5 V output, contrasting with adjustable versions like LD1117DTC-R. It serves as a linear regulator alternative to switching converters in noise-sensitive applications.

Replacement Considerations

LD1117DT25TR (SMD version), LD1117S25R (SOT-223 package). Verify pin compatibility and thermal performance before substitution.