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SMD inductors, there are several factors to consider?
Mar 31, 2017


          SMD inductors, there are several factors to consider? Traditional Chip Winding Power Inductors (CD Series and RH Series).jpg

1, the highest working voltage of the inductor

It refers to the voltage at which the resistor does not overheat or breakdown due to electrical breakdown during long-term operation. If the voltage exceeds the specified value, sparks are generated inside the resistor, causing noise and even damage.


2. Inductance noise electromotive force

The noise electromotive force of the chip inductor can be thought less in the simple circuit, but it cannot be ignored.

The noise of the wire-wound inductor is only determined by the thermal noise and resistance as well as a frequency band relationship of the temperature and the outside voltage.

The thin-film inductors are not the same as current noise.


3, the inductance can tolerate the error

The common accuracy of the theoretical resistance of the inductor is 5%, 1%, 0.5%, 0.1%, 0.01%.


4, the inductance of invariability

It is to weigh the level that the inductor can be changed under the conditions of the outside world including temperature, humidity, voltage, kung fu and load nature.


5, the additional power of the inductor

How the SMD inductor can be used under normal temperature and humidity conditions, if the surrounding air is not fluent, and in the case of long-term continuation without damage, the inductor can allow maximum power consumption.

The general choice is 1-2 times more power than in the circuit.


6, high frequency characteristics of the inductor

When the SMD inductor is used under high frequency conditions, it is necessary to consider the effect of fixed inductance and inherent capacitance. At this time, the resistor becomes a DC resistance (R0) in series with the dispersion inductance, and then the equivalent circuit is connected in parallel with the dispersion capacitance. Non-wire wound resistor LR=0.01-0.05 microhenry, CR=0.1-5 picofarads, LR of wirewound resistors up to tens of microhenries, CR up to several tens of picofarads, even the line of non-inductive winding Around the resistor, LR still has a few microhenries.

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