4-Channel Bi-Directional Logic Level Converter, BSS138, 5V to 3.3V, for I2C, SPI and UART

IIC I2C Logic Level Converter Bi-Directional 4 Channel BSS138 5V to 3.3V for Arduino Raspberry Pi ESP32 – Seamless Communication Between Mixed Voltage Systems! Key Features & Benefits 🔁 Bi‑Directional, No Direction Control Needed: Each channel automatically converts signals in both directions – perfect for I2C, SPI, UART. 📡 4 Independent Channels: Simultaneously handle up to 4 signals, ideal for multi‑wire buses. 🔌 Simple Wiring: Clearly labeled HV (high side), LV (low side), and GND – no programming required. ⚡ BSS138 MOSFET Design: High‑speed, low on‑resistance, supports data rates up to several MHz. 📏 Ultra‑Compact: Only 16×13mm with 2.54mm pins – breadboard‑friendly. 🌐 Wide Compatibility: Works with Arduino, Raspberry Pi, ESP32, STM32, and any 5V/3.3V mixed system. Product Description Worried about connecting 3.3V sensors to your 5V Arduino? This 4‑channel bi‑directional logic level converter is the solution. Using BSS138 MOSFETs, it automatically translates 5V signals down to 3.3V and 3.3V signals up to 5V, ensuring safe communication between devices on both sides. Perfect for I2C, SPI, UART, and other digital buses. A must‑have tool for any mixed‑voltage project. ⚡ Quick Start Guide & Important Tips 🔹 What You Get & What You Need ✅ This board does: Bi‑directional level shifting between 5V and 3.3V (or other voltage pairs) for digital signals ❌ This board is NOT: An analog level shifter, nor a voltage regulator 🔧 You will need: 5V device (e.g., Arduino Uno), 3.3V device (e.g., sensor), jumper wires, 5V and 3.3V power supplies New to this? Check our Wire Kit – includes female‑to‑female jumper wires 🔹 Wiring in 3 Steps 1.Power: HV → 5V (high‑side power) LV → 3.3V (low‑side power) GND → common ground 2.Signals: HV1–HV4 → 5V device signal pins LV1–LV4 → 3.3V device corresponding signal pins 3.Verify: Check HV and LV voltages with a multimeter before powering up. ⚠️ Important: Do NOT swap HV and LV – reverse connection may damage the module or connected devices. 🔹 Example Use Cases I2C Bus: Connect SDA and SCL to two channels. SPI Bus: Use 4 channels for SCK, MOSI, MISO, CS. UART: Use 2 channels for TX and RX. 🔹 Common Questions ❓ Signal distorted or communication fails? Check power stability (especially LV), ensure common ground, and keep wires short. Lower the communication speed if needed. ❓ Can I use it with 1.8V devices? Yes. Connect LV to 1.8V and HV to 3.3V or 5V, as long as LV ≤ HV. ❓ Does it work for I2C? Yes, bi‑directional channels handle both SDA and SCL perfectly. Specifications Package Includes Single Module: 1 × 4‑Channel I2C Logic Level Converter Module Wire Kit: 1 × Module + 1 × Female‑to‑Female Jumper Wire Set (20cm, 8 pcs)