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With the downscaling of MOSFETs to nanometer dimensions, transistor electrical parameter variability is produced by factors other than variations of physical dimensions and doping profiles, which are there since device fabrication and remain static over time. Besides these time-zero variability factors, factors that lead to performance variability from one instant in time to the other start playing a significant role. Random Telegraph Noise (RTN) is among these relevant time-dependent variability sources. In this work we extend the knowledge of the time-dependent random variability induced by RTN, by providing a statistical model for transistor threshold voltage jitter produced by RTN. The area scaling of threshold voltage jitter is detailed and discussed, supporting designers in transistor sizing towards a more reliable design. Not only the jitter expected in a transistor is modeled, but also its variability among transistors that by design should be equal. Besides analytical modeling, Monte Carlo simulations are run. The simulations account for the charge carrier capture and emission events related to RTN, allowing the proper evaluation of the RTN related jitter. The Monte Carlo simulations validate the analytical model and illustrate the area scaling of jitter and its variability.