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A SPICE custom device is a user-defined element that allows circuit designers to create and simulate components not available in standard SPICE libraries. By specifying unique electrical characteristics and behaviors, custom devices can be modeled using a combination of equations, parameters, and existing SPICE elements. This feature is particularly useful for simulating complex or proprietary components, such as specific transistors, diodes, or integrated circuits, that require tailored performance metrics. Custom devices enhance the flexibility and accuracy of circuit simulations, enabling engineers to analyze innovative designs and novel technologies.