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High temperature rated capacitors

Dielectric Laboratories (DLI), a Knowles brand, has announced a number of specification extensions to its ultra-low ESR and high Q MLC capacitors. In both cases the temperature performance has been increased to 175°C giving engineers more scope in their designs.

The improved TCC (temperature coefficient of capacitance) figures apply to DLI’s UL ceramic dielectric capacitors in case size C07 and AH porcelain dielectric capacitors in case size C17 – both with SMD compatibility.Applications range from impedance matching, power handling, DC blocking, bypass, coupling, tuning and feedback in circuit designs covering oscillators, timing, filters, RF power amplifiers and delay lines.

UL is an EIA Class I Stable TC, NP0, ceramic dielectric, with ultra-low ESR; high Q, and low noise.They are suited for use in applications where heat generation or signal losses are concerns.The devices can be operated at up to 500Vdc over the capacitance range of 0.3 to 47pF, extending to 100pF if de-rated to 200Vdc.

The AH EIA Class I positive TC, P90 porcelain dielectric features a TCC of 0 ± 20ppm/°C, and can be used in applications where high Q, coupled with low ESR, is a priority. The devices have a dielectric constant that increases with temperature giving established reliability; low noise and high self-resonance.Capacitance range starts at 0.3pF and climbs to 1000pF over the voltage range 50V, to a high working voltage of 1kV.

Author
Tom Austin-Morgan

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