Hold Current or I-hold (IH) is the largest steady state current that, under specified ambient conditions, can be passed through a JK PPTC (resettable fuse)device without causing the device to trip into the high resistance state. Trip Current or I-trip (IT) is the smallest steady state current that, if passed through a JK PPTC device, will cause the device to trip, under specified conditions.
The device may exhibit a variety of behaviors depending on a variety of factors such as:current rise time; length of time the device is exposed to this current; and ambient temperature. The device may stay in the low resistance state, transition to the high resistance state quickly, or transition to the high resistance state after a long time.
The range of current values between IH and IT represents a zone where performance of the device with respect to tripping can not be predicted with certainty. Depending on the initial resistance of the device and the ambient and mounting conditions, the device could either maintain a low resistance state and hold this current or switch into a high resistance state if the current is sufficiently high.
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