Product_description: ['4 pieces set <br>4X MC74AC161DG IC: digital 4bit,binary counter Channels: 1 SMD SO16 2-6VDC ON SEMICONDUCTOR<br>Manufacturer: ON SEMICONDUCTOR <br>Type of integrated circuit: digital <br>Kind of integrated circuit: 4bit <br>Kind of integrated circuit: binary counter <br>Number of channels: 1 <br>Mounting: SMD <br>Case: SO16 <br>Supply voltage: 2...6V DC <br>Operating temperature: -40...85°C', "74AC Series 2 to 6 V Synchronous Presettable Binary Counter - SOIC-16 For more info refer to the specification sheet located in the 'Downloads' section below the image"] (Page 1)