For environments in which operating temperatures and/or frequencies are too high for polypropylene capacitors, mica capacitors provide a substantially more cost-efficient solution than widely-used ceramic technology.
Mica dielectrics feature:
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A low loss angle (tan δ<5x10-4)
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A dielectric constant that is independent of temperature
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A flexible operating temperature range up to 150°C
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High dielectric constant (ε=~8) that allows higher capacitance per unit volume