Functional Solutions
Surface Arcing on Chip Components
Surface arcing (arc-over, flash-over, corona discharge) is an undesirable high voltage discharge which can cause interface and/or component failure. Surface arcing occurs when the applied voltage exceeds the dielectric strength of the component surface. High potential difference between the opposing terminations can lead to partial ionization of the air and allow a spark to discharge, this spark is visible, audible, and the associated corona discharge will create electrical noise.
Poor roughness and high porosity on chip surface will entrap more impurities and moisture which are easily ionized when the high voltage (especially over 1KV) is applied.
Poor roughness and high porosity on chip surface will entrap more impurities and moisture which are easily ionized when the high voltage (especially over 1KV) is applied.
PCS-501, a coating solution for protecting surface arcing
PCS-501 is a coating solution of highly-insulating polymer for protecting surface arcing. With PCS-501 coating, surface roughness and porosity of chips, such as MLCC, can be improved a lot and therefore surface arcing can be improved with ease.
| Color | viscosity (cps) |
N.V. (%) |
Drying |
Curing |
transparent |
7-10 |
10~15% |
R.T. / 10min. |
100℃ / 30min. |
 |
Coated MLCC (PCS-501) resulted in higher BDV (breakdown voltage) than original one (non-coated MLCC) by over 30%.
Surface arcing of the coated MLCC was improved. : Original – 100% chips less than 5 KV : Coated - 70~80% of total chips over 6 KV |
|
After coated with PCS-501, roughness and porosity of chip surface were highly improved. |