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.
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
| 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 |
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.
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.
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.