Ultra-low ESR MLC Caps Sustain Higher Temperatures


DLI has improved the temperature performance of its ultra-low ESR and high Q MLC capacitors to a higher level of 175 degrees Celsius giving engineers more scope in their designs. 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.

These improved TCC (temperature coefficient of capacitance) values apply to 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. They find use where heat generation or signal loss are concerns. They can be operated at up to 500Vdc over the capacitance range of 0.3pF to 47pF, extending to 100 pF if de-rated to 200Vdc.

The AH EIA Class I positive TC, P90 porcelain dielectric has a TCC of 0 ± 20 ppm/ºC. Applications are where high Q, coupled with low ESR, is a priority. They have a dielectric constant that increases with temperature (90 ppm/°C) giving established reliability, low noise and high self-resonance. The devices are useful for temperature compensation where other board components may be losing capacitance with temperature. Capacitance range is 0.3 pF to 1000 pF over the voltage range 50V, to a high working voltage of 1kV.

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