Explanation some technical terms for magnetic component(9)

SRF(Self-resonant frequency)
The frequency at which the inductor's distributed capacitance resonateds with the inductance, it is at this frequency that the inductance is equal to the capacitance and they cancell each other, the inductore will act purely resistive with a high impedance at the SRF point,the distributed capacitance is caused by the turns of wire layered on top of each other and around the core, this capacitance is in parallel to the inductance ,at frequencies above the SRF, the capacitive reactance of the parallel combination will become the dominant component, also, the Q of the inductor is equal to zero at the SRF point since the inductive reactance is zero, the SRF is specified in MHz and is listed as a minimum value on product data sheets.

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