This is an 18pF, 50V, 0603 (1608 metric) surface-mount multilayer ceramic capacitor (MLCC) manufactured by TDK, and labeled CGA3E2C0G1H180JT0Y0N. This MLCC is RoHS-compliant, and features a “Y5V” or “Y” temperature characteristic, which is suitable for general purpose applications like timing, bypassing and filtering for frequencies up to around 200MHz. The small size and high capacitance make it suitable for a wide range of applications in fields such as automotive, consumer electronics, telecommunications, and medical products.