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Several key inductor parameters such as inductance, self resonant frequency (SRF), and DC resistance are listed in the data sheet. The specifications shown on this slide are specific to 25°C, although a wider operating temperature range of -55 to +155°C is offered. When DC current flows through an inductor, the component temperature will rise and the inductance will drop. The IRMS is defined as the amount of DC current to cause inductor temperature to rise to a level specified by the manufacturer; 40°C, for instance. The ISAT is the amount of DC current to cause inductance to drop to a level specified by the manufacturer; 30%, for instance. The inductance versus IDC and temperature rise versus IDC plot included on this slide provides a wider spectrum of IRMS and ISAT details. Lastly, the operating temperature is not the ambient temperature; rather, it is the inductor surface temperature which is the combined ambient and self-rise temperature under operation.
