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Bidirectional Logic Level Converter IC Circuit
Amazon.com: SparkFun Logic Level Converter - Bi-Directional step down 5V signals to 3.3V AND steps up 3.3V to 5V Board Dimensions: 0.63 x 0.52" (16.05 x 13.33mm) : Industrial & Scientific
arduino - What's wrong with my simulation for Bi-directional logic level converter? - Electrical Engineering Stack Exchange