# Where do I enter the ESR for a capacitor?

**URL:** <https://forum.plexim.com/t/where-do-i-enter-the-esr-for-a-capacitor/249>\
**Category:** PLECS\
**Tags:** component, esr, capacitor\
**Created:** [January 16, 2018, 5:35pm UTC](https://forum.plexim.com/t/where-do-i-enter-the-esr-for-a-capacitor/249 "2018-01-16T17:35:27Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Plexim\_Support\_Team](https://dub1.discourse-cdn.com/flex006/user_avatar/forum.plexim.com/plexim_support_team/32/6_2.png) [@Plexim\_Support\_Team](https://forum.plexim.com/u/Plexim_Support_Team)\
**Post date:** [January 16, 2018, 5:35pm UTC](https://forum.plexim.com/t/where-do-i-enter-the-esr-for-a-capacitor/249/1 "2018-01-16T17:35:27Z")

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<div class="post-metadata">

**Author:** ![Plexim\_Support\_Team](https://dub1.discourse-cdn.com/flex006/user_avatar/forum.plexim.com/plexim_support_team/32/6_2.png) [@Plexim\_Support\_Team](https://forum.plexim.com/u/Plexim_Support_Team)\
**Post date:** [January 16, 2018, 5:37pm UTC](https://forum.plexim.com/t/where-do-i-enter-the-esr-for-a-capacitor/249/2 "2018-01-16T17:37:12Z")

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Passive components in PLECS are idealized and do not include physical parameters such as the associated resistance. You can simply place a resistor in series with a capacitor to add this effect, however. Attached is a PLECS Standalone model that contains a custom subsystem where a capacitor includes an equivalent series resistance (ESR) under the hood and is accessible as a mask parameter. It is simply provided for users who do not want to add a resistor in series connection each time in the schematic, but do require that a capacitor has an ESR associated with it.

[cap\_w\_esr.plecs](https://forum.plexim.com/uploads/short-url/od8hj7POuZSmC0Q5Sl7VYOV7xFn.plecs) (5.79 KB)