Inductance Value: 

Unit of measurement usually used are nano-henries (nH), micro-henries (uH), milli-henries (mH), and henries (H). The conversion relationship between them is,

1uH=1000nH

1mH=1000uH

1H=1000mH.

Inductance Tolerances and Symbols: 

Based on universality and standardization of tolerance representation, the letter symbols used below represent different tolerance values,

D: ±0.5% (very rarely used)

F: ±1% (rarely used)

G：±3%

J：±5%

K：±10%

L：±15%

M：±20%

P：±25%

N：±30%.

Direct Current Resistance: 

DCR (Direct Current Resistance). Unit of measurement usually used are milli-ohms (m Ω), ohms (Ω),and kilo-ohms (k Ω). The conversion relationship between them is,

1Ω=1000mΩ

1kΩ=1000Ω.

For the selection of DC resistors in inductive products, the smaller the resistance value is the better (the heat and power-loss generated by itself while current or signal flowing through will be less).

Saturation Current:

Isat. Unit of measurement usually used are milliampere (mA) and ampere (A). The conversion relationship between them is,

1A=1000mA.

Saturation current refers to the maximum current that the core material of an inductor can withstand when it enters a saturated state. When the current reaches or exceeds this value, the core of the inductor can no longer provide linear magnetic field strength, resulting in a sharp decrease in the inductance value.

The value of DC current at which the inductance value drops 30% from its initial value is usually defined as Isat (Saturation Current) of inductor.

Temperature Rise Current: 

Irms. Unit of measurement usually used are milliampere (mA) and ampere (A). The conversion relationship between them is,

1A=1000mA.

Temperature Rise Current refers to the current that heat generated by its own resistance (DCR) during the continuous flow of direct current or alternating current at a specific ambient temperature, causing the temperature to rise to the allowable limit.

DC current that causes the temperature rise (△T=40℃) from 25℃ is usually defined as Irms (Temperature Rise Current) of inductor.

It is worth mentioning that the testing method for the Temperature Rise Current stated in our company's products is not based on the temperature sensor method used on the market to measure the surface temperature of the product or copper conductor. Instead, it is based on the thermodynamic Kelvin formula and the temperature coefficient of copper conductor. Using a 7-bit high-precision instrument, the temperature rise current inside the conductor is obtained by measuring the subtle changes in the current and voltage values applied to the inductor. This classic testing method has very high accuracy and reliability, and worthy of trust.