The Electronics Components, Assemblies & Materials Association (EIA) characterizes C0G dielectric as a Class I material. Components of this classification are temperature compensating. Typically, they are used for resonant circuit applications or those where Q and stability of capacitance characteristics are required. C0G exhibits no change in capacitance with respect to time or voltage while exhibiting a negligible change in capacitance with reference to ambient temperature. Capacitance change is limited to ±30 ppm/ºC from -55°C to +125°C.
For more information about EIA Classifications, see this FAQ on Temperature Coefficients. C0G capacitors are sometimes called “NPO” or “NP0”.
This datasheet has more information about KEMET’s C0G Ceramic Capacitors.
C = Capacitance
ε0 = Permittivity of free space
κ = Dielectric constant
A = Electrode area
d = Dielectric thickness
C = ε0 * A/d
Capacitor Stacks are a series of capacitors mounted in stacks of 2, 3, 4 and 6 components into a single compact surface mount package. Capacitor stacks, also commonly referred to as bulk capacitance offers a broad range of capacitance and voltage ratings for applications in all market segments.
Category Temperature (Tc)
Maximum recommended operating temperature; voltage derating may be required at TC.
Category Voltage (Uc)
Maximum recommended peak DC operating voltage for continuous operation at the category temperature (TC).
Definition: KEMET’s Ceramic Chip Capacitor Array is available with either C0G or X7R dielectric. These arrays are multiple capacitor elements integrated into one common monolithic structure.
Array technology offers reduced placement costs and increased throughput. This is achieved by alternatively placing one device rather than two or four discrete devices. Use of ceramic arrays also saves board space which translates into increased board density and more functions per board. Ceramic Arrays consume only a portion of the space required for standard chips resulting in savings in inventory and pick/place machine positions.
More information about KEMET Ceramic Arrays can be found in the C0G Array and X7R Array datasheets.
Clamping voltage is the highest voltage that a protection device, such as MOV, allows to pass before activating. Once activated, a varistor becomes a low impedance path. This function is useful for limiting transient voltages in a circuit.
Constant Current Regulator
Constant Current Regulators (CCRs) maintain a constant output current even if operating from a varying voltage. They are ideal for driving LEDs in lighting applications. They are also useful as current sources for shunt references, or for micro-power biasing, as well as buffering and current-limiting applications.
A coupling capacitor is used to remove a DC offset from an AC signal such as an analog music signal. This enables the signal to be transmitted between two circuits that may have different DC bias voltages.
Cracking also known as flex cracks are created in capacitors when board flex stress/bending stress is applied to a circuit board with ceramic components already affixed to the PCB. KEMET offers several board flex crack mitigation products to eliminate these issues.
Learn more about what Flexible Mitigation Capacitors KEMET offers or read a whitepaper on Flexible Termination Reliability in Harsh Environments.
Creepage is the shortest path between two conductive parts, or between a conductive part and the bonding surface of the equipment, measured along the surface of the insulation. Many factors can define the creepage distance of an HV MLCC…not just the termination separation. Solder overrun can shorten the creepage distance, as well as surface contamination (especially on an X7R dielectric that has a more porous surface) related to the end customer’s processing. Contaminants can become trapped in the pores and allow arcing despite rigorous adherence to published creepage specs.
Learn more about Arc Shield Technology, read a whitepaper on ArcShield for Automotive, or see what High-Voltage Ceramic Capacitors KEMET offers.
Also known as the Curie point, is the critical point where a material’s intrinsic magnetic moments change direction. Materials have different structure of intrinsic magnetic moments that depend on temperature. The Curie temperature can also be used to describe the temperature where a material’s spontaneous electric polarization changes to induced electric polarization or the reverse upon reduction of the temperature below the Curie temperature.
The amount of charge stored in a capacitor depends on the capacitance and voltage rating, also known as the CV product. Sometimes we refer to similar terms: “high CV” or “CV Density.”