Q&A Corner : Answer
What test cases are there in reliability tests of ceramic capacitors?
The following table shows items for reliability tests of ceramic capacitors that our company performs.
| Reliability items | Explanation |
|---|---|
Operating Temperature Range |
Temperature range where the product can be used |
| Storage Conditions | Temperature range where the product can be stored |
Rated Voltage |
Upper voltage limit where the product can be used |
Withstanding Voltage (Between terminals) |
No breakdown or damage when specified over voltage is applied |
Insulation Resistance |
Insulation resistance must not be below the specified value. |
| Capacitance (Tolerance) | Capacitance at room temperature must be within the specified range. |
| Q or Dissipation Factor | Lower Q limit or upper dissipation factor limit at room temperature |
| Temperature Characteristic (Without voltage application) | Capacitance change by temperature must be within specified range at operating temperature range. |
| Deflection | The apperance must be normal and capacitance must be within specified range after specified deflection is given to the board. |
| Adhesive Strength of Terminal Electrodes | No terminal separation or its indication by specified physical pressure |
| Body Strength | No mechanical damage by specified physical pressure |
| Solderability | At least 95% of terminal electrode is covered by new solder. |
| Resistance to Soldering | The apperance must be normal and each electric characteristics must not change over specified range after the product is exposed to high temperature by soldering. |
| Temperature Cycle (Thermal Shock) | The apperance must be normal and each electric characteristics must not change over specified range after the product is alternately exposed to the upper and lower limit of the operating temperature range specified number of times. |
| Humidity (Steady State) | The apperance must be normal and each electric characteristics must not change over specified range after the product is continuously exposed to the highly humid environment for specified time. |
| Humidity Loading | The apperance must be normal and each electric characteristics must not change over specified range after the specified voltage is continuously applied to the product under the highly humid environment for specified time. |
| High Temperature Loading | The apperance must be normal and each electric characteristics must not change over specified range after the specified voltage is continuously applied to the product under the maximum temperature of the operating temperature range for specified time. |
Please refer to catalogs for each item in detail.
Please make sure to refer to individual specifications for reliabilities of each product.
