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| Created: 03/16/2004 |
Product: Ceramic |
| Updated: 08/27/2008 |
Category: Capacitor Selection
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What is the difference between military BX & BR, and how does it compare with commercial X7R, & X5R? How about military BP, as compared to commercial C0G, C0H, & C0K? |
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Description :
What is the difference between military BX & BR, and how does it compare with commercial X7R, & X5R? How about military BP, as compared to commercial C0G, C0H, & C0K?
Answer :
Military BX and BR are designations defining the maximum change in capacitance with respect to temperature and applied DC voltage.
For the BX, the maximum allowable capacitance shift from nominal (25C and 0 VDC) is +15%/-25% over the range of -55C to +125C, with DC voltages of 0 & rated voltage. The BR characteristic is similar, except that it allows a wider variation of +15%/-40%.
Commercial X7R chips are rated over the full military range of -55C to +125C, with a maximum capacitance shift of +/- 15% over that range – BUT they do not have a requirement for maximum capacitance shift with voltage. Due to the thinner dielectrics used for extended values in commercial chips, the capacitance shift with voltage may be considerably greater than that of military BX and BR. Commercial X5R is similar to commercial X7R, but is rated over a lesser, non-military range of -55C to +85C.
Commercial C0G will meet the temperature/voltage capacitance stability requirements of military BP – but other construction and testing requirements will not be the same as the military products. Commercial C0H and C0K (looser variations of C0G not offered by KEMET) will not meet the capacitance stability of military BP – they allow more variation of capacitance with temperature than does BP.
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