The SparkFun Bi-Directional Logic Level Converter safely translates signals between different voltage levels — stepping 5V down to 3.3V and 3.3V up to 5V on the same channel. It also works with 2.8V and 1.8V devices, making it a versatile bridge between mixed-voltage systems.

Each board provides 4 bi-directional channels with clearly labelled high-side and low-side pins. Simply connect your high voltage to HV, low voltage to LV, and a common ground — signals are shifted automatically in both directions.

Key Features

• Bi-Directional – Steps up and steps down on the same channel simultaneously
• 4 Channels – Convert 4 signals at once (2 inputs + 2 outputs per side)
• Flexible Voltage – Works with 1.8V, 2.8V, 3.3V, and 5V logic levels
• BSS138 MOSFETs – Reliable, proven level-shifting circuit
• Compact – 16.05 × 13.33 mm (0.63" × 0.52")

Ideal For

• Connecting 3.3V sensors to 5V Arduino boards
• Interfacing Raspberry Pi (3.3V) with 5V peripherals
• I²C and SPI bus level shifting
• Any project mixing different logic voltage levels

Package Contents

• 1× SparkFun Bi-Directional Logic Level Converter

Resources

• Hookup Guide
• Schematic (PDF)
• BSS138 Datasheet (PDF)
• GitHub – Design Files