The XC18V04VQ44I is an obsolete in-system programmable IC manufactured by Xilinx Inc. It comes in a 44-VQFP (10x10) package and has a memory size of 4Mb. The IC has a supply voltage of 3 V to 3.6 V and can operate in a temperature range of -40°C to 85°C. The XC18V04VQ44I is a high popularity IC and is commonly used. It is compliant with REACH and is halogen-free. The XC18V04PC44I, XC18V04VQG44C, XC18V04VQ44I, and XC18V04VQG44I are alternative parts.