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Why do we use polarized capacitor?

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Why do we use polarized capacitor?


Why does the LM1117 data sheet specifically specify tantalum capacitors?Amplifier capacitorsWhat happens to a polarity sensitive capacitor when you feed a square wave through it?Why are capacitors with large values are manufactured polarized?Why does capacitor polarity matter?Is it safe to use series polarized capacitors to form non-polarized capacitors to be used for higher rated voltage?Replacement of Tantalum CapacitorWhy is this power cable sometimes polarized and sometimes not?Can I use polarized capacitors in a location where they shouldn't be polarized?Non-Polarized Electrolytic Capacitor Replacement






.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;








3












$begingroup$


I want to know is the polarized capacitor has the advantage that they are used in some circuits?



For example, in a schematic of the BISS001 PIR controller IC, in some places, a polarized capacitor is used and in some places a non-polarized capacitor one.



Can I use a non-polarized capacitor with the same voltage and capacitance instead of these polarizing capacitors?



Reference Docs:



1.BISS001 datasheet



2.HC-SR501 PIR MOTION DETECTOR datasheet



3.Grove - PIR Motion Sensor or EasyEDA link



What I've understand from your answers is why the electrolytic capacitors are used, and why these are polarized.
But the designers of this circuit could have used a non-polarized capacitor or even polarized tantalum capacitors. Is it true? As the (Grove - PIR Motion Sensor) module uses polarized tantalum capacitors.



I want to know is the polarized capacitors are being used for circuit protection or is there any other reason(Regardless of the type of capacitor)?
Is there a problem if these capacitors are replaced with non-polarized capacitors in this circuits?






capacitor circuit-design polarity







share|improve this question









New contributor




hamid mousavi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$











  • $begingroup$
    It's not because we want them polarized, but them being polarized is a consequence of how they'r emade.
    $endgroup$
    – Hearth
    8 hours ago










  • $begingroup$
    Compare the prices of electrolytic caps with ceramic (or film) caps in the range of 10uF ~22uF (after taking bias voltage derating into consideration) and you will have one of the reasons.
    $endgroup$
    – Wesley Lee
    8 hours ago










  • $begingroup$
    The very thin oxide layers, providing insulation for a certain polarity, provides a very compact energy storage module. Just view those useful electrolytic capacitors as early versions of self-assembled-nano-tech; the manufacturing process creates the very thin oxide layer: the oxide is GROWN or FORMED.
    $endgroup$
    – analogsystemsrf
    8 hours ago










  • $begingroup$
    Is there a problem if these capacitors are replaced with non-polarized capacitors in this circuits? -- no, there is no problem. But you may find it hard to find non-polarized capacitors of the same specification. Non-polarized capacitors are usually in the nF range and are usually rated for low voltage use (5V or less). If you want anything in the uF or mF and/or rated at tens of volts you will have to make do with polarized capacitors
    $endgroup$
    – slebetman
    59 mins ago


















3












$begingroup$


I want to know is the polarized capacitor has the advantage that they are used in some circuits?



For example, in a schematic of the BISS001 PIR controller IC, in some places, a polarized capacitor is used and in some places a non-polarized capacitor one.



Can I use a non-polarized capacitor with the same voltage and capacitance instead of these polarizing capacitors?



Reference Docs:



1.BISS001 datasheet



2.HC-SR501 PIR MOTION DETECTOR datasheet



3.Grove - PIR Motion Sensor or EasyEDA link



What I've understand from your answers is why the electrolytic capacitors are used, and why these are polarized.
But the designers of this circuit could have used a non-polarized capacitor or even polarized tantalum capacitors. Is it true? As the (Grove - PIR Motion Sensor) module uses polarized tantalum capacitors.



I want to know is the polarized capacitors are being used for circuit protection or is there any other reason(Regardless of the type of capacitor)?
Is there a problem if these capacitors are replaced with non-polarized capacitors in this circuits?






capacitor circuit-design polarity







share|improve this question









New contributor




hamid mousavi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$











  • $begingroup$
    It's not because we want them polarized, but them being polarized is a consequence of how they'r emade.
    $endgroup$
    – Hearth
    8 hours ago










  • $begingroup$
    Compare the prices of electrolytic caps with ceramic (or film) caps in the range of 10uF ~22uF (after taking bias voltage derating into consideration) and you will have one of the reasons.
    $endgroup$
    – Wesley Lee
    8 hours ago










  • $begingroup$
    The very thin oxide layers, providing insulation for a certain polarity, provides a very compact energy storage module. Just view those useful electrolytic capacitors as early versions of self-assembled-nano-tech; the manufacturing process creates the very thin oxide layer: the oxide is GROWN or FORMED.
    $endgroup$
    – analogsystemsrf
    8 hours ago










  • $begingroup$
    Is there a problem if these capacitors are replaced with non-polarized capacitors in this circuits? -- no, there is no problem. But you may find it hard to find non-polarized capacitors of the same specification. Non-polarized capacitors are usually in the nF range and are usually rated for low voltage use (5V or less). If you want anything in the uF or mF and/or rated at tens of volts you will have to make do with polarized capacitors
    $endgroup$
    – slebetman
    59 mins ago














3












3








3


1



$begingroup$


I want to know is the polarized capacitor has the advantage that they are used in some circuits?



For example, in a schematic of the BISS001 PIR controller IC, in some places, a polarized capacitor is used and in some places a non-polarized capacitor one.



Can I use a non-polarized capacitor with the same voltage and capacitance instead of these polarizing capacitors?



Reference Docs:



1.BISS001 datasheet



2.HC-SR501 PIR MOTION DETECTOR datasheet



3.Grove - PIR Motion Sensor or EasyEDA link



What I've understand from your answers is why the electrolytic capacitors are used, and why these are polarized.
But the designers of this circuit could have used a non-polarized capacitor or even polarized tantalum capacitors. Is it true? As the (Grove - PIR Motion Sensor) module uses polarized tantalum capacitors.



I want to know is the polarized capacitors are being used for circuit protection or is there any other reason(Regardless of the type of capacitor)?
Is there a problem if these capacitors are replaced with non-polarized capacitors in this circuits?






capacitor circuit-design polarity







share|improve this question









New contributor




hamid mousavi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$




I want to know is the polarized capacitor has the advantage that they are used in some circuits?



For example, in a schematic of the BISS001 PIR controller IC, in some places, a polarized capacitor is used and in some places a non-polarized capacitor one.



Can I use a non-polarized capacitor with the same voltage and capacitance instead of these polarizing capacitors?



Reference Docs:



1.BISS001 datasheet



2.HC-SR501 PIR MOTION DETECTOR datasheet



3.Grove - PIR Motion Sensor or EasyEDA link



What I've understand from your answers is why the electrolytic capacitors are used, and why these are polarized.
But the designers of this circuit could have used a non-polarized capacitor or even polarized tantalum capacitors. Is it true? As the (Grove - PIR Motion Sensor) module uses polarized tantalum capacitors.



I want to know is the polarized capacitors are being used for circuit protection or is there any other reason(Regardless of the type of capacitor)?
Is there a problem if these capacitors are replaced with non-polarized capacitors in this circuits?






capacitor circuit-design polarity




capacitor circuit-design polarity






share|improve this question









New contributor




hamid mousavi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









New contributor




hamid mousavi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question








edited 1 hour ago









Community♦

1




1






New contributor




hamid mousavi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









asked 8 hours ago









hamid mousavihamid mousavi

162




162




New contributor




hamid mousavi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





hamid mousavi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






hamid mousavi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











  • $begingroup$
    It's not because we want them polarized, but them being polarized is a consequence of how they'r emade.
    $endgroup$
    – Hearth
    8 hours ago










  • $begingroup$
    Compare the prices of electrolytic caps with ceramic (or film) caps in the range of 10uF ~22uF (after taking bias voltage derating into consideration) and you will have one of the reasons.
    $endgroup$
    – Wesley Lee
    8 hours ago










  • $begingroup$
    The very thin oxide layers, providing insulation for a certain polarity, provides a very compact energy storage module. Just view those useful electrolytic capacitors as early versions of self-assembled-nano-tech; the manufacturing process creates the very thin oxide layer: the oxide is GROWN or FORMED.
    $endgroup$
    – analogsystemsrf
    8 hours ago










  • $begingroup$
    Is there a problem if these capacitors are replaced with non-polarized capacitors in this circuits? -- no, there is no problem. But you may find it hard to find non-polarized capacitors of the same specification. Non-polarized capacitors are usually in the nF range and are usually rated for low voltage use (5V or less). If you want anything in the uF or mF and/or rated at tens of volts you will have to make do with polarized capacitors
    $endgroup$
    – slebetman
    59 mins ago

















  • $begingroup$
    It's not because we want them polarized, but them being polarized is a consequence of how they'r emade.
    $endgroup$
    – Hearth
    8 hours ago










  • $begingroup$
    Compare the prices of electrolytic caps with ceramic (or film) caps in the range of 10uF ~22uF (after taking bias voltage derating into consideration) and you will have one of the reasons.
    $endgroup$
    – Wesley Lee
    8 hours ago










  • $begingroup$
    The very thin oxide layers, providing insulation for a certain polarity, provides a very compact energy storage module. Just view those useful electrolytic capacitors as early versions of self-assembled-nano-tech; the manufacturing process creates the very thin oxide layer: the oxide is GROWN or FORMED.
    $endgroup$
    – analogsystemsrf
    8 hours ago










  • $begingroup$
    Is there a problem if these capacitors are replaced with non-polarized capacitors in this circuits? -- no, there is no problem. But you may find it hard to find non-polarized capacitors of the same specification. Non-polarized capacitors are usually in the nF range and are usually rated for low voltage use (5V or less). If you want anything in the uF or mF and/or rated at tens of volts you will have to make do with polarized capacitors
    $endgroup$
    – slebetman
    59 mins ago
















$begingroup$
It's not because we want them polarized, but them being polarized is a consequence of how they'r emade.
$endgroup$
– Hearth
8 hours ago




$begingroup$
It's not because we want them polarized, but them being polarized is a consequence of how they'r emade.
$endgroup$
– Hearth
8 hours ago












$begingroup$
Compare the prices of electrolytic caps with ceramic (or film) caps in the range of 10uF ~22uF (after taking bias voltage derating into consideration) and you will have one of the reasons.
$endgroup$
– Wesley Lee
8 hours ago




$begingroup$
Compare the prices of electrolytic caps with ceramic (or film) caps in the range of 10uF ~22uF (after taking bias voltage derating into consideration) and you will have one of the reasons.
$endgroup$
– Wesley Lee
8 hours ago












$begingroup$
The very thin oxide layers, providing insulation for a certain polarity, provides a very compact energy storage module. Just view those useful electrolytic capacitors as early versions of self-assembled-nano-tech; the manufacturing process creates the very thin oxide layer: the oxide is GROWN or FORMED.
$endgroup$
– analogsystemsrf
8 hours ago




$begingroup$
The very thin oxide layers, providing insulation for a certain polarity, provides a very compact energy storage module. Just view those useful electrolytic capacitors as early versions of self-assembled-nano-tech; the manufacturing process creates the very thin oxide layer: the oxide is GROWN or FORMED.
$endgroup$
– analogsystemsrf
8 hours ago












$begingroup$
Is there a problem if these capacitors are replaced with non-polarized capacitors in this circuits? -- no, there is no problem. But you may find it hard to find non-polarized capacitors of the same specification. Non-polarized capacitors are usually in the nF range and are usually rated for low voltage use (5V or less). If you want anything in the uF or mF and/or rated at tens of volts you will have to make do with polarized capacitors
$endgroup$
– slebetman
59 mins ago





$begingroup$
Is there a problem if these capacitors are replaced with non-polarized capacitors in this circuits? -- no, there is no problem. But you may find it hard to find non-polarized capacitors of the same specification. Non-polarized capacitors are usually in the nF range and are usually rated for low voltage use (5V or less). If you want anything in the uF or mF and/or rated at tens of volts you will have to make do with polarized capacitors
$endgroup$
– slebetman
59 mins ago











1 Answer
1






active

oldest

votes


















12












$begingroup$

The physical size of a capacitor is a function of the thickness of the dielectric (among other things).



Early on, it was discovered that the oxides of certain metals (aluminum and tantalum in particular) made good dielectrics, and could be made very thin through a chemical process — orders of magnitude thinner than other dielectrics such as waxed/oiled paper and plastic film. Therefore, the electrolytic capacitor was invented to provide high capacitance in a reasonable volume.



Unfortunately, the chemical process requires that the voltage across the capacitor must have only a single polarity, so these capacitors are "polarized". Reversing the polarity degrades and eventually destroys the oxide layer. It's something we just have to live with in order to take advantage of this technology.



The ability to produce high-value capacitors in nonpolarized technologies such as multilayer ceramic means that it is now possible to use them where only a polarized capacitor would have been previously available. There is generally no problem with making this substitution, although you may need to consider some of the quirks of the technology you're switching to.



For example, some high-K (high dielectric constant) ceramics exhibit significant capacitance changes with voltage. This might be acceptable in a coupling or bypass application, but completely unacceptable in a filter design.






share|improve this answer











$endgroup$













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    1 Answer
    1






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    active

    oldest

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    active

    oldest

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    12












    $begingroup$

    The physical size of a capacitor is a function of the thickness of the dielectric (among other things).



    Early on, it was discovered that the oxides of certain metals (aluminum and tantalum in particular) made good dielectrics, and could be made very thin through a chemical process — orders of magnitude thinner than other dielectrics such as waxed/oiled paper and plastic film. Therefore, the electrolytic capacitor was invented to provide high capacitance in a reasonable volume.



    Unfortunately, the chemical process requires that the voltage across the capacitor must have only a single polarity, so these capacitors are "polarized". Reversing the polarity degrades and eventually destroys the oxide layer. It's something we just have to live with in order to take advantage of this technology.



    The ability to produce high-value capacitors in nonpolarized technologies such as multilayer ceramic means that it is now possible to use them where only a polarized capacitor would have been previously available. There is generally no problem with making this substitution, although you may need to consider some of the quirks of the technology you're switching to.



    For example, some high-K (high dielectric constant) ceramics exhibit significant capacitance changes with voltage. This might be acceptable in a coupling or bypass application, but completely unacceptable in a filter design.






    share|improve this answer











    $endgroup$

















      12












      $begingroup$

      The physical size of a capacitor is a function of the thickness of the dielectric (among other things).



      Early on, it was discovered that the oxides of certain metals (aluminum and tantalum in particular) made good dielectrics, and could be made very thin through a chemical process — orders of magnitude thinner than other dielectrics such as waxed/oiled paper and plastic film. Therefore, the electrolytic capacitor was invented to provide high capacitance in a reasonable volume.



      Unfortunately, the chemical process requires that the voltage across the capacitor must have only a single polarity, so these capacitors are "polarized". Reversing the polarity degrades and eventually destroys the oxide layer. It's something we just have to live with in order to take advantage of this technology.



      The ability to produce high-value capacitors in nonpolarized technologies such as multilayer ceramic means that it is now possible to use them where only a polarized capacitor would have been previously available. There is generally no problem with making this substitution, although you may need to consider some of the quirks of the technology you're switching to.



      For example, some high-K (high dielectric constant) ceramics exhibit significant capacitance changes with voltage. This might be acceptable in a coupling or bypass application, but completely unacceptable in a filter design.






      share|improve this answer











      $endgroup$















        12












        12








        12





        $begingroup$

        The physical size of a capacitor is a function of the thickness of the dielectric (among other things).



        Early on, it was discovered that the oxides of certain metals (aluminum and tantalum in particular) made good dielectrics, and could be made very thin through a chemical process — orders of magnitude thinner than other dielectrics such as waxed/oiled paper and plastic film. Therefore, the electrolytic capacitor was invented to provide high capacitance in a reasonable volume.



        Unfortunately, the chemical process requires that the voltage across the capacitor must have only a single polarity, so these capacitors are "polarized". Reversing the polarity degrades and eventually destroys the oxide layer. It's something we just have to live with in order to take advantage of this technology.



        The ability to produce high-value capacitors in nonpolarized technologies such as multilayer ceramic means that it is now possible to use them where only a polarized capacitor would have been previously available. There is generally no problem with making this substitution, although you may need to consider some of the quirks of the technology you're switching to.



        For example, some high-K (high dielectric constant) ceramics exhibit significant capacitance changes with voltage. This might be acceptable in a coupling or bypass application, but completely unacceptable in a filter design.






        share|improve this answer











        $endgroup$



        The physical size of a capacitor is a function of the thickness of the dielectric (among other things).



        Early on, it was discovered that the oxides of certain metals (aluminum and tantalum in particular) made good dielectrics, and could be made very thin through a chemical process — orders of magnitude thinner than other dielectrics such as waxed/oiled paper and plastic film. Therefore, the electrolytic capacitor was invented to provide high capacitance in a reasonable volume.



        Unfortunately, the chemical process requires that the voltage across the capacitor must have only a single polarity, so these capacitors are "polarized". Reversing the polarity degrades and eventually destroys the oxide layer. It's something we just have to live with in order to take advantage of this technology.



        The ability to produce high-value capacitors in nonpolarized technologies such as multilayer ceramic means that it is now possible to use them where only a polarized capacitor would have been previously available. There is generally no problem with making this substitution, although you may need to consider some of the quirks of the technology you're switching to.



        For example, some high-K (high dielectric constant) ceramics exhibit significant capacitance changes with voltage. This might be acceptable in a coupling or bypass application, but completely unacceptable in a filter design.







        share|improve this answer














        share|improve this answer



        share|improve this answer








        edited 6 hours ago

























        answered 8 hours ago









        Dave Tweed♦Dave Tweed

        123k9152267




        123k9152267




















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