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TDK has many flex cracking solutions including, Open Mode, Soft Termination, Serial Design, and MEGACAP.
Open Mode caps have an extended "L" gap (the distance between the termination and the electrode) as shown in Figures 1 and 2. This means that when the common 45° crack occurs, it will not travel through the active stack, and therefore will create an open circuit instead of a short circuit.
Figure 1: A diagram showing the "L" gap on a standard MLCC.
Figure 2: A diagram showing how the expanded "L" gap helps prevent a short circuit from flex cracking.
Figure 3: A diagram showing the location of the conductive resin layer (shown in green for emphasis).
Figure 4: A diagram showing the internal architecture of a serial design capacitor. A short has not occurred, even though the part has cracked.
The two capacitors ensure that if one cracks, there still exists a second capacitor. This helps prevent a short circuit in the event of a crack. However, TDK's serial design is also equipped with Soft Termination. This helps prevent a crack in the first place.
Figure 5: A diagram showing the construction of a TDK MEGACAP.
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