REG103FA-3KTTT

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

The REG103FA-3KTTT is a Texas Instruments DMOS low-dropout linear regulator in the TO-263 (DDPAK-5) package. It provides a fixed 3.3V output with a maximum current of 500mA. The device features a typical dropout voltage of 115mV at full load and maintains high accuracy within ±2%. Ground pin current is typically 1mA at 500mA output, dropping to 0.5µA when disabled. It includes foldback current limit and thermal protection.

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

• Utilizes new DMOS topology for ultra-low dropout voltage and fast transient response without requiring an output capacitor for stability.
• Features very low output noise, making it suitable for portable communications equipment.
• Includes internal foldback current limit and thermal shutdown circuitry for robust protection.

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

• Portable communication devices
• Battery-powered equipment
• Personal digital assistants
• Modems

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

Verify the specific ordering suffix KTTT corresponds to the DDPAK-5 package containing 50 units per tube. Confirm that the fixed 3.3V output version matches the application requirements. Check the Package Option Addendum for the most current status, as some variants may be obsolete or not recommended for new designs.

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

Select this component for applications requiring a stable 3.3V rail with up to 500mA load capability. Ensure the input voltage remains above the minimum operating range of 2.1V and accounts for the dropout voltage under load. Consider the thermal resistance characteristics of the TO-263 package for heat dissipation in the final design.

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

This part belongs to the REG103 family of low-noise, low-dropout regulators from Texas Instruments. The family offers various fixed voltages and an adjustable version across SOT223-5, DDPAK-5, and SO-8 packages. The FA designation indicates the DDPAK-5 surface-mount configuration.

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

Public confirmed substitutes include REG103FA-3.3/500 and REG103FA-3.3KTTTG3. Verify package compatibility and electrical specifications before substitution.