MLCCs: Multilayer Ceramic Chip Capacitors

Würth Elektronik offers a large portfolio of MLCC sizes up to 2220. While downsizing might be the right choice for some applications, others require larger sizes of MLCCs for keeping the required electrical performance, volumetric capacitance and DC bias behavior. Long term availability ex stock. High quality samples free of charge make Würth Elektronik the perfect long-term partner for your MLCC demands.

#askLorandt explains: What miniaturization means for MLCCs and what alternatives are possible

Product Benefits

  • Large portfolio from 0402 up to 2220
  • Long term availability
  • Detailed application-relevant measurement data available
  • Sophisticated simulations available in online platform REDEXPERT

The MLCC Portfolio

Series C Ur Ceramic
WCAP-CSGP
General Purpose
0.5 pF - 100 µF 6.3 - 100 V (DC) NP0, X7R, X5R
WCAP-CSMH
Mid and High Voltage
10 pF - 470 µF 200 - 3000 V (DC) NP0, X7R
WCAP-CSRF
High Frequency
0.2 pF - 33 pF 25- 50 V (DC) NP0
WCAP-CSST
Soft Termination
220 pF - 2.2 µF 16 - 2000 V (DC) X7R
WCAP-CSSA
Safety Capacitors
Safety class X1/Y2, X2
33 pF - 4.7 nF 250 V (AC) NP0, X7R

What are the challenges of Downsizing?

Worse electrical stability / performance

For class 2 ceramics X7R / X5R: higher capacitance loss due to DC bias.

Assembly times are rising

  • With smaller sizes positioning may run more slowly.
  • In the future also several components need to be picked as replacement.

For sizes <0201, most of it has to be invested in new production equipment

It may require new feeder benches, nozzles and pick & place machines.

Re-design necessary

  • Blocks engineering resources for new projects.
  • Releases (such as e.g. UL) must be repeated.
  • Changes in the manufacturing process needed.

Online Platform REDEXPERT

Check your design and component performance to find the best fitting MLCCs in REDEXPERT:

The Basics of MLCCs

What needs to be considered while selecting MLCCs?

Class 1 (e.g.: NP0 = C0G)

Mainly the C-tolerance needs to be taken into account.

  • Dependend on specific type no / linear temperature dependence dependence (e.g. C0G / NP0).
  • No further derating.

These types provide stable and precise C-values. For all applications where a fixed and stable C-value (e.g. RTC) is needed the proper choice.

Class 2 (e.g.: X7R, X5R, Y5V)

There are multiple effects that influence the given C-value:

  • C-tolerance (according to datasheet)
  • Non linear temperature dependence (manufacturer specific, related to material mix / construction)
  • DC-Bias (manufacturer specific, related to material mix / construction)
  • Aging behavior

The capacitance value of datasheet will be different with in an running application. Check the manufacturer data to be able to assume ocurring effects.

Example 1: How much capacitance do you really get?

885012108011: 22µF / X5R / 1206 / 20% @ 6V DC

Example 2: How much capacitance do you really get?

885012109006: 22µF / X7R / 1210 / 10% @ 6V DC

Why is capacitance drift of class 2 MLCCs that massive?

  • Class 2 ceramics use Barium Titanate as base material
  • This material is ferroelectric and this characteristic is the reason for a strong dependence on the capacitance.
    • Capacitance vs. Temperature
    • DC Bias - dependency of capacitance against DC voltage
    • Aging Behaviour
  • In addition, this material has a piezoelectric structure which can also result in microphonic effects.