A method, system, and computer program product provide the ability to simulate an electronic circuit. An analog model represents an analog circuit and is wrapped to serve as a module in an event based simulator. The module has a first start state and an input (controlled by the event based simulator). Upon a change in a value of the input, the analog model shows a transient behavior. The value of the input is changed to begin simulating the electronic circuit. In response to the changing of the value, if not already cached, the transient behavior is cached with a key consisting of a combination of the first start state and the value of the input. If already cached, the transient behavior is retrieved from the cache. The simulation of the circuit is output based on the cached transient behavior.