3-in-1 DC-DC Buck Converter Module Selectable 3.3V 5V 12V Fixed Output - Step-Down Power Supply

3-in-1 DC-DC Buck Converter Module - Selectable 3.3V / 5V / 12V Fixed Output Step-Down Power Supply

A versatile step-down buck converter module with three selectable fixed output voltages. Simply solder the output selection jumper pad on the back of the board to set your required output - 3.3V, 5V, or 12V - and connect your power source. Ideal for powering microcontrollers, sensors, and modules in embedded projects where a fixed regulated voltage is needed without a multi-turn potentiometer.

Key Features

• 3 selectable fixed output voltages: 3.3V, 5V, or 12V - chosen by soldering the back-pad jumper
• Step-down (buck) topology - efficient DC-DC conversion, lower heat than linear regulators
• 3-pin through-hole output header - direct breadboard or PCB mount
• Compact green PCB - minimal footprint for tight enclosures and prototype boards
• Suitable for input voltages above the selected output (e.g. 7-24V input for 5V output)
• Onboard inductor and filtering capacitors - clean regulated output
• No adjustment needed after soldering - stable fixed output voltage

Specifications

• Topology: Step-Down (Buck)
• Output Voltage Options: 3.3V / 5V / 12V (solder-pad selectable)
• Input Voltage: Must exceed selected output (typical: 5V-24V DC)
• Output Selection: Solder jumper pad on back of PCB (3.3V / 5V / 12V)
• Output Connector: 3-pin through-hole header (IN, GND, OUT)
• PCB Color: Green
• Form Factor: Compact inline module

How to Select Output Voltage

• Inspect the back of the PCB - three solder pads are labeled 3.3V, 5V, and 12V
• Bridge the pad corresponding to your required output voltage with a small solder blob
• Apply input voltage above your selected output and verify output before connecting your load

Perfect For

• Arduino, ESP32, and Raspberry Pi Power Supply from 12V or 24V Sources
• 3.3V Sensor and Module Power Regulation
• 5V Logic Level Power in Automotive and Industrial Applications
• 12V Fixed Regulated Output from Higher Voltage Source
• Embedded System Power Rail Design and Prototyping
• Electronics Lab Bench and Breadboard Power Supply Module

Order now and get a compact, selectable fixed-voltage buck converter for your next embedded power supply project.