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| Created: 07/27/2004 |
Product: Ceramic |
| Updated: 08/27/2008 |
Category: Capacitor Selection
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What is the difference between military and commercial ceramic capacitors?
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Description :
What is the difference between military and commercial ceramic capacitors?
Answer :
Both military and commercial ceramic capacitors share many similarities in construction, and testing. However, military products are different in the following categories:
1. Available Ratings: Commercial products have a much larger selection of available ratings, since they can be supplied with the latest technology, including base metal electrodes (BME), high capacitance achieved through thin lower-voltage dielectric materials and higher layer counts, and additional case sizes and dielectric formulations.
2. Voltage Characteristic: Military products are supplied against military designations of BX and BP, while commercial products are supplied against EIA designations of X7R and C0G (plus other non-military designations, such as X5R, Y5V, and Z5U.) The military BX specifications include a voltage coefficient (change in capacitance with applied DC voltage) which is specified, while the similar commercial X7R specifications do not include this requirement.
3. Materials: The military products have not yet been qualified for BME, so they continue to be supplied in PME (precious metal electrodes).
4. Testing: Military products require burn-in, plus other special tests. Commercial products focus on in-line testing, rather than burn-in and other special testing.
For more specific information on the differences, particularly for MLCC versions, KEMET has a brief technical paper – please request at our website or from your salesperson.
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