3.3V/5V Logic Level Converter (2-channel high-voltage and low-voltage logic )
4-channel I2C-safe Bi-directional Logic Level Converter [BSS138] : ID 757 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
5v to 3.3v logic level shifter - CircuitLab
Convertisseur Niveau logique Bidirectionnel - RobotShop
3PCS IIC I2C Logic Level Converter Bi-Directional Module 5V to 3.3V For Arduino | eBay
Wholesale Taidacent 3.3 v À 5 v I2c 4 Canaux Haute Vitesse Niveau Traducteur Niveau Logique Shifter Convertisseur Bidirectionnel LLC Circuit module From m.alibaba.com
5V <-> 3.3V Level Shifter - General Electronics - Arduino Forum
Taking It To Another Level: Making 3.3V Speak With 5V | Hackaday