Ultra-low ESR and high-Q MLC capacitors offer increased design scope

Knowles / DLI has announced a number of specification extensions to its ultra-low ESR and high-Q MLC capacitors. In both cases DLI have taken the temperature performance to a higher level of 175C giving engineers more scope in their designs. The improved TCC (temperature coefficient of capacitance) figures apply to DLI’s highly successful UL ceramic dielectric capacitors in case size C07 (0711) and AH porcelain dielectric capacitors in case size C17 (1111) – both with SMD Compatibility. UL is an EIA Class I Stable TC, NP0, Ceramic dielectric, with Ultra Low ESR; High Q, and Low Noise. Parts can now be operated up to +175C with TCC of 0 ± 60ppm/C (limited to +125C at 0 ± 30 ppm/C). They find use in any application where heat generation or signal loss are concerns. They are considered High Voltage in that case size C07 and can be operated at up to 500VDC over the capacitance range of 0.3pF to 47pF, extending to 100pF if de-rated to 200VDC. The AH EIA Class I Positive TC, P90 Porcelain dielectric now achieves the +175C rating with a TCC of 0 ± 20 ppm/C. Applications are where High Q, coupled with Low ESR, is a priority. They have a dielectric constant that increases with temperature (90ppm/C) giving Established Reliability; Low Noise and High Self-resonance. Useful for temperature compensation where other board components may be losing capacitance with temperature. Capacitance range starts at 0.3pF and climbs to 1000pF over the voltage range 50V, to a high working voltage of 1kV. 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.