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7929 Views 7 Replies Latest reply: Apr 9, 2014 1:40 PM by Taylor123 RSS
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Feb 22, 2014 6:04 AM

Matched capacitor pairs

I am looking for NPO capacitor pairs that match each other's capacitance value closely. Their values can be 10%  but the difference between the parts in the pair must be much closer. 

100 Volt parts around a few nF. Does anybody make these?

  • davecuthbert Apprentice 87 posts since
    Feb 18, 2014
    Currently Being Moderated
    Feb 26, 2014 7:59 AM (in response to TomBezdek)
    Matched capacitor pairs

    Will 2% matching work for your application?

     

    Using a Digikey search reveals several 1% tolerance 100 volt NPO capacitors around a few nF. The 399-9811-ND is in stock and is a leaded 4700 pF, 100 V, NPO ceramic having a tolerance of 1%.

  • RobCichon Novice 1 posts since
    Feb 26, 2014
    Currently Being Moderated
    Feb 26, 2014 8:58 AM (in response to TomBezdek)
    Matched capacitor pairs

    Buy several of one value and measure to match capacitance value.

  • Taylor123 Novice 9 posts since
    Mar 10, 2014
    Currently Being Moderated
    Apr 9, 2014 1:40 PM (in response to TomBezdek)
    Matched capacitor pairs

    When using a thermistor as the temperature sensor, it becomes the most important component for the temperature regulating system. To achieve high system performance, the thermistors should have low short term and long term drifts in the R-T relationship, the resistance vs. the temperature, compact size, and reliable. Some low cost thermistors are coated with epoxy materials and have large short and long term resistance drift, i.e., when sensing the same temperature, the resistance changes with time, causing the system with a wrong sensed temperature, thus, the target object temperature is drifted. Glass coated thermistors, on the other hand, have almost zero short and long term drift, all our thermistors are of this type. When choosing the thermistor for a temperature control system, these are the main specifications to consider: operating temperature range, sensitivity, drift, size, mounting approach, etc. Our thermistors and thermistor assemblies are mainly NTC thermistors, and can be used with our TEC controllers and TEC modules for building high stability low drift temperature control systems. These NTC thermistors and thermistor assemblies have high precision (+/-0.25C@25C), compact size (bare version down to 0.8mm diameter), and are coated with glass material on all the bare thermistors and the thermistor of which the thermistor assemblies are made, resulting in low both short and long term drift. The NTC thermistors come in bare and lugged forms, the former is for point sensing to achieve high accuracy for specific points, such as laser diode die, etc.; the latter is for bulk temperature sensing, such as optical components, etc. If you have any questions about choosing and using thermistors and thermistor assemblies, let us know. We try our best to help.  If you need our products ,please see here http://www.analogtechnologies.com/thermistor.html

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