The Samsung NX300 is a 20.3 MP APS-C camera targeted squarely at the fast growing compact system camera market. The Sensor shows Samsung die marks S5KCT3FX09 and features phase detection auto focus. This Imager Process Review provides a thorough cross-sectional analysis of the general logic and pixel to help understand how the sensor is fabricated. The focus is on the elements specific to image sensors such as microlenses, color filters, pixel architecture, and photocathode. Analysis of the pixel is parallel and perpendicular to the column outline, to show the structure of the pixel array elements. Detailed images focus on the aperture, transistor gate structure, anti-reflective coatings, and photocathode. The cross-sectional analysis includes TEM imaging to highlight the gate oxide thicknesses, transistor gate structure, and back-end processing in the pixel array. SCM and SRP analyses of the doping profiles in the pixel array are included.