Geometry Types

InterFET has over 14 different standard geometry design types and multiple Starting EPI configurations. If starting a design from scratch, start with the geometry. The geometry type dictates the electrical parameters required for an application. Lower numbered geometries like the N0001 series will have lower gate leakage (Igss) and the lower input capacitance (Ciss). Higher numbered geometries like the N3600 will have higher gains (Gm) and higher saturation current (Igss). The higher numbered geometries will also have the lowest noise (En). If a compromise of parameters are needed, start with a geometry type in the middle.

Some geometries are specialized. The N0042 is optimized for high breakdown applications in the 300V to 400V ranges. The N0014 is optimized for high gain applications while maintaining a relatively low Igss and Ciss. The N0903 is optimized for very low noise but has a moderate amount of input capacitance. And the N3600 geometry is the lowest noise JFET in the industry.

Silicon Wafer