LD1117V33 3.3V 800mA Linear Voltage Regulator TO-220

The LD1117V33 3.3V Linear Voltage Regulator is a fixed-output positive voltage regulator designed to provide a stable 3.3V DC supply for electronic circuits. It supports output currents up to 800mA under the specified operating conditions, making it suitable for powering microcontrollers, sensors, communication modules, and other low-voltage electronic components.

Based on the LD1117 low-dropout regulator architecture, this component maintains a regulated output when the input voltage is sufficiently higher than the 3.3V output. It features a typical dropout voltage of approximately 1.1V at 800mA, although the required input-to-output difference depends on load current and operating conditions.

The LD1117V33 is supplied in a three-pin TO-220 package, providing through-hole mounting for prototyping, PCB assembly, and power-regulation circuits. Its package can be attached to a suitable heatsink when required, depending on power dissipation and thermal conditions. Internal current limiting and thermal protection help protect the device during specified fault conditions.

This regulator is useful in embedded electronics, microcontroller circuits, sensor interfaces, and custom power-supply designs. As a linear regulator, it dissipates the voltage difference between input and output as heat. Therefore, input voltage and load current must be selected carefully to keep the device within its thermal limits. A suitable capacitor of at least 10µF is generally required for regulator stability, following the manufacturer's recommended circuit.

Features:

• Fixed regulated 3.3V DC output

• Output current up to 800mA

• Low-dropout linear regulator design

• Three-pin TO-220 package

• Through-hole mounting

• Internal current limiting

• Thermal overload protection

• Suitable for embedded and digital electronics

• Stable power supply for compatible low-voltage circuits

Specifications:

• Part Number: LD1117V33

• Product Type: Positive Linear Voltage Regulator (LDO)

• Output Voltage: 3.3V fixed

• Maximum Output Current: 800mA

• Maximum Input Voltage: 15V

• Typical Dropout Voltage: 1.1V at 800mA

• Output Voltage Accuracy: ±1% at 25°C for the specified device

• Package: TO-220

• Number of Pins: 3

• Mounting Type: Through-hole

• Protection Features: Current limiting and thermal protection

• Operating Junction Temperature: 0°C to 125°C

• Stability Capacitor: Minimum 10µF, following the datasheet's recommended circuit

Specifications are based on the STMicroelectronics LD1117 datasheet. Thermal performance and allowable output current depend on the input voltage, load, heatsinking, and ambient temperature. (STMicroelectronics Datasheet)

Applications:

• 3.3V power supplies for microcontrollers

• Sensor and communication module power

• Embedded systems and development boards

• Digital logic circuits

• Low-voltage peripheral power supplies

• Electronics prototyping and laboratory circuits

• Custom PCB power regulation

• Post-regulation for suitable DC power supplies