Der Blätterkatalog benötigt Javascript.
Bitte aktivieren Sie Javascript in Ihren Browser-Einstellungen.
The Blätterkatalog requires Javascript.
Please activate Javascript in your browser settings.
Knowhow 6 1 2021 Powered by Committed to Excellence www rutronik com Silicon in the third dimension For highdensity silicon or 3D silicon capacitors manufacturers use the third dimension to significantly enlarge the capacitor surfaceand with it the capacitancewithout increasing the base surface area of the capacitor This is how capacitance values are achieved that would require around 80 layers in MLCCs with a component thickness of 100 µm The Murata SiCap for example offers a whole 100 nF with a size of 0402 and a thickness of just 100 μmequivalent to ten Class 1 dielectric C0Gs of size 0603 and 400 μm thickness Thinner versions are also available from Murata on request Capacitance values range from several pF to a few µF and voltages range from 5 to 450 V Their material and construction properties make these highdensity silicon capacitors especially wellsuited to highfrequency applications from 10 up to 110 GHz Their electrical characteristics are similar to the known ceramic type NP0 = C0G Unlike the C0G MLCCs however they can already be used as standard versions up to 150°Cand as hightemperature versions up to as high as 250°C Figure Murata Figure 4 A SiCap from Murata offers the capacitance values of ten C0G capacitors with 100 nF Figure Murata Figure 3 The 3D structure enables miniaturization by a factor of 100 Figure 5 The compact CeraLink capacitors from TDK are suitable both for use as snubber capacitors and as DC link capacitors Figure TDK range This is enabled by their lead lanthanum zirconate titanate P L ZT construction referred to as a ceramic Thanks to their extremely low ESL and ESR CeraLink capacitors support higher switching frequencies and currents This allows for the use of cheaper more robust semiconductors for example highspeed IGBTs instead of MOSFETs This method often enables the value of the capacitor the space on the board the magnetic components and the heatsink to be reduced thus also reducing the total cost As snubbers CeraLink capacitors are a superb solution to reduce the risk of semiconductors being damaged by voltage spikes CeraLink capacitors are based on chips 7 85 mm × 6 84 mm × 2 65 mm from which the manufacturer assembles a variety of connection options and combinations Figure 6 Rechargeable solidstate SMD battery with MLCC construction The worlds first rechargeable solidstate SMD battery might not be a capacitor but the basic principles of its engineering design constructed as an MLCC are consistent with one CeraCharge batteries offer capacitance around one thousand times that of MLCCs of comparable physical size In other words they have a comparably high energy density with a minimal volume Then there are the benefits of ceramic multilayer components namely robust safety and largescale serial production The use of a solid ceramic electrolyte eliminates the risks of fire and explosion and of electrolyte leakage CeraCharge supports a very large temperature range of 20°Cto +80°Cand is therefore suitable for outdoor use The properties open up new opportunities for CeraCharge in particular for IoT applications Thanks to their construction and thicknesses of just 50 to 400 µm they are available not just in soldered versions but also as bonded versions and for embedded installation This means that there are ideal designs available for automotive medical RFID highfrequency and broadband applications categorized as standard highreliability hightemperature and highfrequency models Capacitors with antiferromagnetic properties If ceramic capacitors are used as snubber or DC link capacitors in a range of around 500 Vto 900 Vfor working frequencies of several hundred kHz up to 1 MHz MLCCs made of X7R ceramics i e those that use the ferromagnetic barium titanate as their base material are frequently pushed to the limits of usability Due to their pronounced negative DC bias behavior the necessary effective capacitance values in particular are almost impossible to achieve Antiferromagnetic properties are provided by the CeraLink capacitors from TDK This means that they exhibit an increase in capacitance with the applied voltage which enables much higher currents within the operating