HomeElectrical ComponentWhat is Non-Polarized Capacitor: definition, uses and the pros

What is Non-Polarized Capacitor: definition, uses and the pros

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A non-polarized capacitor is one of several types of capacitors. It is less expensive, may be placed in any direction, and have a longer lifespan. And this post will go into more detail: What is the definition of a non-polarized capacitor? Where is it used? And how can we select a non-polarized capacitor? Let us have a more detailed look at this new post in Linquip.

What Is Non-Polarized Capacitor?

The non-polarized capacitor can be connected in either direction. Except for one rare kind, it is not harmed by heat while soldering (polystyrene). It has high voltage ratings of at least 50V and is frequently 250V or more. It might be tough to identify the values since it uses a variety of labeling schemes. The non-polarized capacitor has no positive or negative polarity, allowing it to be linked in circuits without regard for which lead is attached to the positive and which to the negative. Fixed capacitors are further divided into two types: polarized or electrolytic capacitors and non-polarized capacitors. Non-polarized capacitors have low capacitance and leakage current ratings.

What is Non-Polarized Capacitor

The two electrodes in the non-polarized capacitor can be arbitrarily placed into the circuit and will not leak. The non-polarized capacitor is mostly utilized in coupling, decoupling, feedback, compensation, and oscillation circuits. In contrast to its polarized version, as the polarized one can only be utilized in one voltage direction, the non-polarized capacitor uses both voltage directions. As a result, the non-polarized capacitor outperforms the polarized capacitor in terms of voltage direction.

The non-polarized capacitor is typically below 1 MF and is used for resonance, coupling, frequency selection, current limiting, and other applications. Non-polarized capacitors with big capacity and high voltage are also available, and are commonly employed in reactive power compensation, motor phase shifting, frequency conversion power phase shifting, and other applications.

The non-polarized capacitor can also be utilized in audio circuits to prevent DC from flowing over audio waves. As a result, it is employed as smoothening filters to eliminate undesirable ripples that might harm electronic circuits.


Let’s cover the following common questions and the answers about the non-polarized capacitor:

What is one example of using a non-polarized capacitor?

A non-polarized capacitor is used in pure alternating current circuits and, due to its low capacitance, can also be used in high-frequency filtering. Here’s an example of how the capacitor may be used:

The RC spark suppression circuit is primarily introduced in this example. When the radio and television programs are received by the antenna, and the fluorescent bulb is turned on and flashes, you will hear an erratic sound from the radio or television speaker. Many brilliant lines and dots on the TV screen are generated by high-frequency clutter interference induced by electric sparks.

When inductive circuits are separated, a spark is produced between the contacts. The switch S is abruptly switched off, and the current quickly disappears; because the current change is substantial, a large self-inductance is created at both ends of the coil. This electromotive force may prevent current from changing direction, and its magnitude is proportional to the applied voltage. When the two are overlaid, the voltage U1 across the switch becomes extremely high, and when the voltage exceeds a specific threshold, the “sharp” voltage breaks down the air and forms an electric spark.

What is Non-Polarized Capacitor

The spark may ablate and oxidize the contacts, eventually causing them to fail. As a result, it is critical to remove the spark between the contacts. When the circuit is interrupted, as long as the current of the control coil does not drop too low, the voltage at the two ends of the coil will not be too high, resulting in no spark. The RC spark suppression circuit is linked at both ends of the inductor. A part of the magnetic field energy in the inductor is wasted on R and r, while the remainder is transformed into electric field energy in capacitor, causing it to re-discharge and so extinguishing the spark.

How can we Select a Non-polarized Capacitor?

A non-polarized capacitor is relatively easy to pick and utilize. We can use the following methods:

  1. Select a capacitor with an acceptable accuracy. Most of the time, the capacity requirements are not particularly high, and it is okay to have a capacity that is nearly equal to the reference capacity. The absolute value of the error in oscillation circuits, filtering circuits, delay circuits, and tone circuits must be within 0.3 percent -0.5 percent.
  2. Choose the capacitor based on the circuit requirements. Paper capacitors are commonly employed in low-frequency AC bypass circuits. Mica or ceramic capacitors are commonly utilized in high frequency or high voltage circuits.
  3. Capacitors with rated voltages greater than or equal to the actual requirements might be chosen.
  4. Low-frequency capacitors cannot be used to replace high-frequency capacitors.
  5. Take into account the operating temperature, functioning range, and temperature coefficient of the capacitor based on the application occasion.
  6. When the nominal capacity cannot be fulfilled, the series or parallel technique can be used, but the voltage applied to the capacitor must be less than the withstand voltage of the capacitor.

Can we replace a polarized capacitor with a non-polarized capacitor?

We can almost always replace a polarized capacitor with a non-polarized capacitor of the same value and voltage rating. The opposite, however, is not feasible.

How can we identify a capacitor as a non-polarized one?

The non-polarized capacitor can be connected any way since it lacks polarity. We can use the “Digital Multimeter” to examine the readings. If the multimeter readings are near to the real values, as stated on the capacitor, the capacitor is regarded as excellent.

What is Non-Polarized Capacitor

Can a non-polarized capacitor be connected to a DC circuit?

The non-polarized capacitor can be used in both DC and AC circuits. Only when a capacitor is charging or draining can current flow.


A capacitor is a type of electrical device that stores electric energy in the form of an electric field. In this post, we went over basic knowledge of non-polarized capacitator and what it is. Well. We hope this article provided a quick yet clear introduction of this type of capacitors and its applications. However, if you need to ask any questions about the non-polarized capacitor, feel free to contact us via registering in Linquip.

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