JFET Geometries

With over 14 different standard geometry designs and multiple starting EPI configurations, InterFET offers over 2000 different part types; Making us the largest supplier of the broadest range of JFET products in the industry.

Finding your application solution starts with the geometry selection.  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.

Once you find a geometry solution, look for a standard part in that geometry. Start with a part that is close to the application and have InterFET customize it if needed to optimize the performance.

Over 50% of InterFET’s business is custom solutions. Customers usually start with a standard part and customize it for their application. Customization can be with many parameters, but there are trade-offs with any application. A higher Idss or Gm usually requires a higher pinch-off Voltage (Vp). Higher gain parts will always have higher Ciss and Igss.

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