The AMS1117-3.3 is a monolithic low-dropout (LDO) voltage regulator designed to provide a stable 3.3 V output from input voltages up to 9 V. Widely used in microcontroller circuits, sensor modules, and logic-level converters, it offers reliable performance in a compact SOT-223 package.

Specifications

• Input Voltage:
  • 4.3 V to 9 V DC (typical operating range)
• Output Voltage:
  • Fixed 3.3 V DC
• Maximum Output Current:
  • Up to 1 A (recommended ≤ 800 mA for continuous use)
• Dropout Voltage:
  • ~1.1 V at 1 A load
• Line Regulation:
  • 0.2% to 0.4%
• Quiescent Current:
  • ~5–10 mA
• Package Type:
  • SOT-223 (surface mount)
• Operating Temperature:
  • –40 °C to +125 °C

Features

• Fixed 3.3 V output for powering logic-level devices
• Low dropout design for efficient regulation from 5 V sources
• Compact footprint for space-constrained PCBs and modules
• Integrated thermal and overcurrent protection
• Ideal for powering ESP8266, SD cards, sensors, and 3.3 V logic ICs
• Common use cases:
  • 5 V → 3.3 V conversion for microcontrollers
  • Inline regulation for USB-powered circuits
  • Voltage reference for analog sensors