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Impedance, denoted Z, is an expression of the opposition that an electronic component, circuit, or system offers to alternating and/or direct electric current.Impedance is a vector (two-dimensional)quantity consisting of two independent scalar (one-dimensional) phenomena: resistance and reactance.
Thermal impedance is defined as a quotient of the time function of a temperature difference divided by the impressed power dissipation. In the datasheets this value is given as a function of time in the form of a diagram. The static upper range value is the actual thermal resistance. This is indicated in the datasheets in the form of a characteristic. Depending on the choice of temperature detection points, distinctions are made. For example: 1  Z th(j-c) / R th(j-c) : junction-case.