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Ceramic Capacitors

Exxelia offers a diverse portfolio of multi-layer ceramic capacitors (MLCCs) including low and high voltage, high capacitance values, and high-temperature resistance (up to 250°C). Exxelia ceramic capacitors are manufactured using Precious Metal Electrode (PME) technology which grants superior reliability and durability in challenging environments like aviation engines, oil exploration, and medical implants, pulse applications up to space applications. Indeed, Exxelia ceramic capacitors meet stringent quality standards, including numerous ESA QPL qualifications. Exxelia also offers custom design solutions and a non-obsolescence policy, supported by industrial tooling suitable for both high and low quantities, to meet specific project requirements effectively.

 

Our chip ceramic capacitors are available in a range of temperature coefficients such as NPO, 2C1, BR, and X7R, catering from industrial to military and even space-grade requirements. They come in all standard EIA sizes with multiple terminations (including an optional nickel barrier / non-magnetic variant) to ensure compatibility with any soldering technique. They can also be declined with different finishes (varnished, encapsulated, molded or conformal coated ceramic capacitors) and with different leads styles: DIL and ribbon leads for surface mounted ceramic capacitors ; or axial, radial or through hole N-style DIL for through-hole ceramic capacitors.

 

Designed with advanced ceramic technology, our high-capacitance ceramic capacitors offer reliability and compact size for switched mode power supplies (SMPS) and DC-DC converters, ideal for hybrid assemblies and low-profile circuit designs.

 

Our high-voltage MLCCs are offered in class 1 (NPO), class 2 (X7R), and C48X dielectrics, providing substantial size and space advantages. Available in chip, molded / conformal coated (radial leads), and stacked forms, these capacitors are well-suited for high-voltage power supplies, multipliers, and high-reliability military and space applications.

 

Exxelia's high-temperature ceramic capacitors utilize class 1 or class 2 ceramic dielectrics made from high-purity oxides, ensuring performance up to 250°C in both chips, stacked and leaded configurations.

 

Exxelia widely used ceramic High-Q MLCC capacitors are designed with P100 or ultra-stable NPO dielectric. These RF microwave capacitors can be used in high voltage applications up to 7200V. For high-frequency high power, high voltage applications such as MRI, NMR, RF generators for laser, plasma applications, power filters, Exxelia has developed the CP and CL series available in large sizes.

Frequently Asked Questions

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What is the RoHS compliance status of SMD capacitors?

The capacitor terminations are generally protected by a nickel barrier formed by electrolytic deposit. This barrier gives chip capacitors leaching performance far exceeding the requirements of all applicable standards. The nickel barrier guarantees a minimum resistance to soldering heat for a period of 1 minute at 260°C in a tin-lead (60/40) or tin-lead-silver (62/36/2) bath without noticeable alteration to the solderability. It also allows repeated soldering-unsoldering and the longer soldering times required by reflow techniques.


However nickel barrier amplifies thermal shock and is not recommended for chip sizes equal or greater than CNC Y (30 30) - (C 282 to C 288 - CNC 80 to CNC 94).

High Temperature Ceramic Capacitors

High temperature ceramic capacitors and high temperature mica capacitors are often used in situations that require a higher voltage or a higher power than normal. Because of the ways in which they are built, they can offer low ESR and excellent inrush current and ripple capabilities that other types of capacitors cannot. The only downside is that they tend to be physically larger than other types of capacitors.

The automotive industry is another area where high temperature capacitors are required. The temperature conditions can vary dramatically depending on what area of a car you’re talking about. The brake systems, the engine and the transmission are often the most temperature intensive areas.

What is Ceramic Capacitors

Excellent temperature resistance, high volume/capacitance ratio, electrical properties and reliability make Exxelia's ceramic capacitors ideal for a wide range of fields of application including medical implants, aircraft flight controls, switched-mode power supply in harsh environments, core samplers for petroleum exploration, and space vehicles. Exxelia also offers Hyper Frequency ceramic capacitors with optimized size and very low ESR. 

These HiQ capacitors offer excellent performance levels for RF applications requiring functional reliability. Typically these applications include civil and military telecommunications (cellular base station equipment, wireless broadband service, Point to-Point or Multipoint radios, radio broadcasting equipment), and MRI coils.

Multilayer Ceramic Capacitors MLCC

Our multilayer ceramic capacitor (MLCC) is a chip capacitor manufactured with layers of ceramic material and metal. The alternating layers can be built up to the desired capacitance range. The dielectric thickness determines the voltage rating. The capacitance is determined by multiplying the number of layers by the amount of active area and then the dielectric constant for the material. This number is then divided by the dielectric thickness. The active area is the overlap between the electrodes.

A capacitor with a thicker dielectric layer handles higher voltages than one with a thinner layer. Inversely, the thinner dielectric will have a higher capacitance rating. The MLCC design provides a significant space-saving advantage over other capacitor styles.

How is Ceramic used in Capacitors ?

Ceramic chips are created with binders and solvents added to a specified ceramic powder. The slurry created is dried, forming a sheet or tape of ceramic material. Metal powder is mixed with solvents and additional ceramic material to create a liquid electrode. The liquid is then printed onto the ceramic layer. Layers of the ceramic sheets are stacked and laminated to form a solid structure.

The solid structure is cut into the desired size. Once cutting is complete, the assembly must be kiln fired. The temperature used in the firing process is critical in determining the capacitor’s characteristics. The process is similar for disc and chip styles. Disc capacitors use long leads to mount through circuit boards. Chips use surface mount technology.

Do I need Class 1 or Class 2 Ceramic Capacitor?

A Class 1 ceramic capacitor is the best choice for applications that demand low losses and high stability. This style provides a reliable capacitance within the designated range of frequency, temperature and voltage. Class 2 series offer higher capacitance, but have wider fluctuations. The thermal stability varies by +/- 15 percent; these should be used in applications that do not require a continual exact capacitance. Exxelia uses NPO and P100 as Class 1 dielectrics ; and BX, 2C1 and X7R as Class 2 dielectrics.

Class 1 feedthrough capacitors offer high frequency noise reduction, and are excellent for use in microwave transmission, medical applications and DC supply and signal lines. Feedthrough design uses an axial-style lead for connections.

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