- Inductance L (tested at a certain test conditions for example 100 KHz, 0.1 , 0 A DC)
- Inductive tolerance: It is the allowed amount of variation from the nominal value specified by the manufacturer (e.g. ±20%).
- Rated operating voltage (across inductor)
- DC Resistance (DCR)
- AC Resistance (ACR)
- AC loss that comes from losses in the core as the magnetic field transitions. This includes eddy current losses and hysteresis losses.
- The AC resistance of the wire due to the skin effect. It can be important at very high frequencies.

- Maximum DC current : Maximum DC current is the DC current at which the inductance falls to 90% of its nominal value or until its temperature rise reaches 30 °C.

Figure: Inductance vs DC Bias Load (or DC Bias Characteristic)

DC Bias current relates to a constant current element that is added to the AC signal.

- Incremental Current Rating: The DC bias current that causes an inductance drop of 5% from the initial zero DC bias inductance value.
- or RMS current:
- for a 20°C rise above 25°C ambient temperature
- for a 40°C rise above 25°C ambient temperature

- Saturation current : The DC bias current that causes the inductor to drop by a specified percentage (e.g. 10% or 20%) from its value without current. See Figure Inductance vs DC Bias Load (or DC Bias Characteristic)
- Q factor or Quality factor:
- Self-Resonant Frequency (SRF) or in Hz
- Curie temperature (in degrees Celsius): It is the temperature at which the core material start to lose its magnetic properties.
- Inductance temperature coefficient: The change in inductance per unit temperature change. Measured under zero bias conditions and expressed in parts per million (ppm).
- Resistance temperature coefficient: The change in DC wire resistance per unit temperature change. Measured at low DC Bias (<1 ) and expressed in parts per million (ppm).
- Magnetic saturation flux density : At this value of flux density, all magnetic domains within the core are magnetized and aligned.
- Shielding
- with shield
- without shield

- Electromagnetic interference (EMI): It refers to the magnetic field radiated away from the inductor into space. The magnetic field may cause interference with other magnetically sensitive components.
- Core material
- Ferrite cores
- Iron powder cores

- Storage temperature range
- Operating temperature range
- Ambient temperature range not including self-temperature rise
- Product temperature range including self-temperature rise. The operating temperature is equal to the ambient temperature plus component’s self-heating . The maximum allowable temperature for an inductor is the maximum ambient temperature plus the maximum temperature rise.

- Moisture Sensitivity Level (MSL)