For a change from 20°C to 100°C, the level of I s increases from 10 nA to a value of 2.56 mA, which is a significant, 256- fold increase. Continuing to 200°C would result in a monstrous reverse saturation กระแส of 2.62 mA. For high-temperature applications one would therefore look for Si diodes with room-temperature I s closer to 10 pA, a level commonly available today, which would limit กระแส to 2.62 μA. It is indeed fortunate that both Si and GaAs have relatively small reverse saturation กระแส at room temperature. GaAs devices are available that work very well in the 200°C to 200°C temperature range, with some having maximum temperatures approaching 400°C. Consider, for a moment, how huge the reverse saturation กระแส would be if we started with a Ge diode with a saturation กระแส of 1 mA and applied the same doubling factor.