LD1117V33C-DG

Overview

The LD1117V33C-DG is a fixed-output positive low-dropout linear regulator manufactured by STMicroelectronics. It provides a stable 3.3 V output with a maximum current capacity of 800 mA. The device supports an input voltage range up to 15 V and features a typical dropout voltage of 1.2 V at full load. It utilizes a TO-220-3 through-hole package designed for industrial applications, operating within a temperature range of 0°C to 125°C. Key electrical characteristics include a power supply rejection ratio (PSRR) of 75 dB at 120 Hz and a static current of 5 mA.

Feature Summary

• Integrated overcurrent and thermal shutdown protection mechanisms ensure device reliability under fault conditions.
• Low dropout voltage design maintains regulation efficiency with minimal input-to-output voltage difference.
• High power supply rejection ratio effectively suppresses ripple and noise from the input source.

Applications

• Industrial control systems requiring stable voltage rails
• Battery-powered equipment needing efficient linear regulation
• General-purpose power supplies in instrumentation

Procurement Notes

Verify the specific suffix 'DG' against the manufacturer's official datasheet to confirm pinout compatibility and package dimensions. Ensure the procurement channel sources genuine components to avoid counterfeit risks associated with power management ICs. Confirm that the supplier documentation explicitly references the LD1117V33C-DG part number rather than generic family equivalents.

Selection Notes

Select this component when a fixed 3.3 V rail is required with moderate current demands up to 800 mA. The TO-220-3 package is suitable for designs prioritizing thermal dissipation and mechanical robustness over compact surface-mount footprints. Consider the 125°C operating limit for industrial environments where ambient temperatures may exceed standard commercial ranges.

Part Context

This component belongs to the LD1117 series of low-dropout regulators produced by STMicroelectronics. The series offers both fixed and adjustable output versions in various packages including SOT-223, DPAK, and TO-220. The LD1117V33C-DG specifically denotes the fixed 3.3 V variant in a through-hole TO-220-3 configuration, optimized for industrial temperature ranges.

Replacement Considerations

Direct pin-compatible substitutes within the same family include other LD1117 variants such as LD1117V33 or LD1117V33-DG, provided the package and thermal requirements match. Verify that any replacement maintains the 800 mA current rating and 3.3 V fixed output specification.