The most effective way to prevent ceramic capacitor cracking is to keep PCB bending and twisting away from the capacitor. Move multilayer ceramic capacitors (MLCCs) away from edges, corners, screw holes, connectors and board-separation lines; orient them for the actual stress direction; support the board during depaneling, assembly and fastening; control solder and copper geometry; measure strain on the real board; and use a soft-termination part when high strain cannot be removed. Manufacturer strain values and bending tests are useful design evidence, not universal pass/fail limits.
What causes a ceramic capacitor to crack?
An MLCC is rigidly attached to copper lands by solder. If the PCB bends or twists, the lands and solder deform and transfer tensile force into the component terminations and ceramic body. Murata explains that a strain crack forms when this tensile stress exceeds the ceramic dielectric’s strength. Ceramic materials tolerate compression better than tension, so a convex board bend can be particularly damaging when it places the mounted part in tension. See Murata’s explanation of the MLCC strain-crack mechanism.
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The bend may occur long after reflow. Typical sources include panel separation, routing or punching, manual handling, connector or harness insertion, installation into a housing, tightening screws, drops, vibration and shock. A board that looks flat on the workbench can still experience a short, high-force deflection at one operation.
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Why a small crack can become a serious electrical failure
A crack can reduce capacitance or produce an open circuit. If it reaches internal electrodes, flux-related organic material or moisture can enter and lower insulation resistance. In severe cases, the defect can progress to a short circuit. TDK warns that an initially open failure may develop into abnormal heating and a short as the crack grows; its guidance is summarized in this flex-cracking FAQ.
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Visual inspection is not a reliable way to clear a board. Fine cracks can be inside the termination or ceramic and remain invisible from the outside. Murata states that chips with strain cracks are difficult to eliminate by visual sorting or other external inspection, so prevention and process control are more dependable than a final cosmetic check.
Prioritize controls in this order
- Remove or reduce the board-bending operation. Review depaneling, connector insertion, housing assembly, screw fastening and any step that clamps, slides or twists the PCB.
- Keep the MLCC out of high-strain locations. Avoid edges, corners, screw holes, connectors, L-shaped bends and panel break lines unless measurement shows the location is safe.
- Orient the part for the real load. Rotate the capacitor so the force from board separation or bending is less likely to pull across the ceramic body.
- Change the panel and board mechanics. Evaluate separation lines, slits, stiffeners, supports and copper geometry on the actual stack-up.
- Control lands, solder and reflow. Excess solder and an unsuitable copper pattern can increase stress during bending.
- Measure strain at the operation that matters. Establish a board-specific limit rather than applying a number from another design.
- Use a compliant termination when necessary. A resin or flexible termination can reduce stress transferred into the ceramic, but it must still meet the circuit’s electrical and environmental requirements.
Place and orient MLCCs to avoid strain
Keep distance from edges and hardware
As an initial layout screen, Murata suggests keeping capacitors at least 10 mm from PCB edges, screw holes and connectors. That 10 mm value is a design suggestion from Murata’s article, not a universal clearance rule: board thickness, support, panel geometry, component size and the actual force determine the strain. If a capacitor must be closer, measure strain at that location instead of assuming the distance is safe.
Do not place a capacitor directly beside a connector that requires substantial insertion force. The connector body can act as a local lever, bending the board where the MLCC is soldered. The same applies to screw holes: tightening a fastener can bow the board around the hole and load nearby components. Corners and narrow necks of an L-shaped PCB are also common stress concentrators.
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Align the capacitor with the separation or bending direction
Place the component parallel to the intended board-break line where that orientation reduces the force transmitted across the part. In practice, compare the capacitor’s long axis with the direction in which the panel or board will move. A different orientation may be better when the dominant load comes from connector insertion or housing assembly rather than depaneling; there is no orientation that is optimal for every geometry.
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Murata’s layout guidance discusses orientation relative to the break line and modeled the use of a slit to reduce strain around a component. Read the original recommendations in Murata’s layout article. Treat the slit and orientation examples as options to verify on your panel, not as guarantees that apply to every board.
Separate the capacitor from the force path
Map how force travels through the PCB. If a blade, router, snap-off tab, fixture jaw, screw or connector pushes at one point, keep the MLCC outside the region between that force and the board support. A capacitor can be electrically close to a circuit while being mechanically remote from the force path; use that freedom when routing permits.
Reduce strain during panel separation and assembly
Support the PCB close to the operation
The best prevention is to avoid unnecessary external force. TDK expresses this directly: “The best way to prevent cracks is to ensure the board is not subjected to unnecessary external forces.” During depaneling, support the board on both sides of the separation line so it does not flex through the component field. During connector or harness insertion, place a fixture or stiffener under the board immediately behind the connector. During screw fastening, support the PCB around the hole and tighten in a sequence and torque that do not bow the assembly.
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Review the separation method
Compare routing, punching, V-grooving, perforations and manual snap-off for the actual panel. Murata’s guidance reports that a slit can reduce strain around a component in its modeled board and says slits are preferable to perforations in its strain-crack guidance. These are design choices to test, not universal acceptance criteria. A separation method that is gentle on one panel can be harsh on another because of board thickness, copper distribution, support and component location.
Inspect tooling for worn blades, excessive clearance, uneven support and a separation direction that pulls toward the MLCC. If the crack appears only after depaneling, compare a supported and unsupported separation trial and measure the board strain during both operations.
Check land, copper and solder geometry
Keep the land from encouraging board deformation
Murata recommends making land dimension C smaller than chip width W and designing the copper pattern so it does not promote PCB deformation during reflow. Apply the recommendation using the selected package’s drawing and land pattern; do not scale a footprint from a different case size without checking the manufacturer’s dimensions.
Large copper areas, abrupt copper changes and asymmetric patterns can alter local stiffness and bending. Review the copper on both sides of the board around the MLCC, especially near slots, cutouts, screw holes and panel rails. The objective is not simply a smaller pad: it is a mechanically balanced board and solder joint that does not concentrate force at one termination.
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Control solder volume and reflow
Excess solder can increase MLCC stress during bending. TDK advises following the component manufacturer’s soldering specifications, including paste volume, profile and termination conditions. Verify stencil apertures, paste deposition, reflow peak and time-above-liquidus against the selected part’s data sheet. If a footprint or process changes, recheck the resulting solder fillets; a visually acceptable fillet can still create an overly rigid or uneven joint.
Measure strain instead of guessing
Use the strain definition consistently
Murata defines strain as ε = ΔL/L, where ΔL is the change in length over the measured length L. In production engineering this is commonly reported in microstrain (μST). Attach strain gauges or use an equivalent validated measurement method at the MLCC location and run the board through every suspected operation: separation, insertion, fastening, housing installation and any relevant cleaning or test step.
Interpret 500 and 1000 μST correctly
Murata reported in 2012 that manufacturers of products that may affect human life often use 500 μST as a strain standard, while manufacturers of general consumer products often use 1000 μST. These are examples of industry practice reported by Murata, not universal MLCC limits. The stress applied to a component depends on board type, thickness and other factors, and customers establish their own standards. Use the values as prompts for a risk review, then validate the actual component, board and process.
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Include cleaning and test equipment
Ultrasonic cleaning can excite board resonance. In its troubleshooting webinar Q&A, Murata advises testing the cleaning equipment and process for capacitor degradation. Run a before-and-after electrical check and inspect representative parts after the cleaning cycle, particularly if the board is thin or has large unsupported areas. The relevant Q&A is available at Murata’s 2025 troubleshooting webinar document.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When to choose a soft-termination MLCC
Resin, flexible or otherwise compliant termination layers can absorb some of the movement between the PCB and the ceramic body. They are useful when a high-strain location cannot be eliminated, such as a constrained connector area, a thin board that must flex, or an installation with unavoidable fastening loads.
TDK’s guide reports a specific board-bending test at 10 mm displacement: standard-terminal products had a 100% body-crack occurrence rate, while resin-electrode products had a 0% body-crack occurrence rate under those displayed test conditions. The result is manufacturer test evidence for that test setup, not a field failure rate or a guarantee for another board, package, displacement profile or assembly process. The guide was updated in September 2026 and is available at TDK’s Flex Crack Countermeasures in MLCCs Vol.1.
KYOCERA AVX describes its FlexiTerm layer as a way to reduce mechanical stress transferred to the ceramic; its technical paper is at the FlexiTerm application document. A compliant termination does not make an MLCC immune to bending. Confirm the exact capacitance, rated voltage, dielectric, case size, temperature grade, DC-bias behavior, insulation resistance, solderability and reliability qualification before substituting a part.
| Question | What to verify before selecting a soft termination |
|---|---|
| Electrical value | Capacitance at operating bias and temperature, tolerance and dielectric match the original requirement. |
| Voltage and environment | Rated voltage, temperature range, humidity and insulation-resistance requirements remain compliant. |
| Mechanical evidence | The manufacturer’s bending test uses a comparable case size, board thickness, displacement and termination construction. |
| Assembly | Land pattern, solder profile, inspection method and rework limits are compatible with the new termination. |
| Failure consequence | Circuits where a short could create a safety or thermal hazard receive additional protection and validation. |
A practical design-and-process review
- Mark every MLCC near a mechanical feature. On the PCB and panel drawings, flag parts near edges, corners, connectors, screw holes, slots, bends and separation lines.
- Map every post-solder operation. List routing, depaneling, manual handling, connector and harness insertion, housing installation, screw fastening, cleaning, test fixtures, drops and vibration.
- Identify the dominant load for each part. Decide whether the board is pulled, pushed, twisted or bowed, and note the direction relative to the capacitor’s long axis.
- Apply the lowest-cost mechanical change first. Move or rotate the part, add local support, change the separation direction or revise the fixture before changing the component.
- Review panel geometry. Evaluate slits, break lines, rails, perforations, slots and stiffeners with the component locations shown. Check both sides of the board for copper features that alter stiffness.
- Audit the footprint and process. Compare land dimensions with the component drawing, inspect paste apertures and confirm the reflow profile and solder volume.
- Measure the suspect operation. Capture strain at the component location under normal production speed and support conditions. Repeat at worst-case locations and with the largest relevant board variation.
- Choose a compliant termination only when needed. Match all electrical, thermal, environmental and assembly specifications, then test the complete board.
- Requalify after changes. Repeat strain measurements and electrical checks after any change to panelization, fixture, connector, screw, solder process, package or termination.
Manufacturing investigation checklist
- Inspect depaneling tooling for wear, misalignment, uneven support and excessive force.
- Compare capacitor location and orientation with the actual break line, not only the nominal CAD drawing.
- Check whether operators support the board immediately beside the connector during insertion.
- Verify housing and screw operations do not force the PCB against a standoff or boss.
- Confirm solder volume and reflow settings against the selected capacitor manufacturer’s specifications.
- Measure strain on thin boards, long boards and boards with cutouts separately; their stiffness can differ substantially.
- Test ultrasonic cleaning for resonance-related degradation when that process is used.
- Use capacitance, insulation-resistance, leakage or dielectric-withstand checks, X-ray, cross-sectioning or other destructive analysis as appropriate. Do not use visual inspection alone to rule out a strain crack.
- Trace failures to the first operation at which the electrical change appears. A capacitor that passes reflow but fails after fastening points to a mechanical process, not necessarily a solder defect.
Diagnose symptoms by when the failure appears
| Observed symptom | Likely investigation path | Useful corrective action |
|---|---|---|
| Failures begin after panel separation | Measure strain at the break line and compare support and tool conditions. | Change separation method or direction, add support, move or rotate the MLCC, and reassess panel slits. |
| Failures occur during connector insertion | Measure force and board deflection at the connector-side capacitor. | Add a local fixture, reduce insertion force, move the part away from the connector or use a compliant termination. |
| Failures follow screw fastening | Check standoff height, hole clearance, torque and tightening sequence. | Support the board, revise the fastening sequence or move the MLCC farther from the hole. |
| Capacitance loss with no visible damage | Suspect an internal crack or electrode interruption. | Use electrical and, where justified, destructive analysis; do not clear the lot by appearance alone. |
| Intermittent leakage or heating develops later | Investigate crack progression, moisture or contamination reaching internal electrodes. | Remove the mechanical cause, improve environmental controls and consider a termination with documented flex-crack resistance. |
| Only one package or location fails | Compare case size, orientation, land geometry and local board stiffness. | Optimize that footprint and location; do not assume the same strain response for every package. |
Compare countermeasures before changing the design
| Decision axis | Questions to answer |
|---|---|
| Board-strain source | Is the load from depaneling, connector insertion, screw mounting, handling, drop, vibration or another operation? |
| Location and orientation | Is the capacitor near an edge, hole, connector, corner, bend or separation line? Can it be moved or rotated relative to the load? |
| Board and panel design | Would a slit, revised separation method, stiffener or different copper and land layout reduce strain in this geometry? |
| Process control | Can support, tooling, solder volume or assembly sequence be changed? Can strain be measured during the relevant operation? |
| Component choice | Does a soft termination meet capacitance, voltage, dielectric, temperature, package and reliability requirements, and does the evidence match this board? |
| Failure consequence | Could a short create a safety, thermal or reliability hazard that warrants stronger mitigation, redundancy or additional validation? |
Validate the finished design
Qualification should exercise the complete mechanical path, not just a coupon or an isolated capacitor. Measure strain on production-representative boards, then repeat electrical checks after depaneling, connector insertion, fastening, housing installation, cleaning and any environmental exposure that could reveal a latent crack. Include worst-case board thickness, copper distribution, fixture position, operator method and component tolerance where those variables are controlled in production.
Use the manufacturer’s package-specific guidance and your own failure data to set acceptance criteria. A 500 μST or 1000 μST example, a 10 mm clearance suggestion or a 10 mm displacement bending result cannot replace board-specific evidence. If the circuit is safety-critical, treat any unexplained open, leakage change, capacitance shift or intermittent behavior as a potential mechanical defect until analysis proves otherwise.
Quick Recap
Key takeaways for a robust PCB design
- Prevent bending at its source; layout changes alone cannot compensate for an abusive depaneling or assembly operation.
- Keep MLCCs away from edges, corners, holes, connectors, bends and separation features, using the 10 mm Murata suggestion only as an initial screen.
- Orient the part parallel to the relevant break or stress direction when that reduces force across the ceramic.
- Use local supports and stiffeners during separation, insertion and fastening.
- Match land, copper, solder volume and reflow settings to the selected component’s specifications.
- Measure strain on the actual board and define a documented, board-specific limit.
- Consider a soft termination when strain cannot be removed, while matching every electrical and environmental requirement.
- Do not rely on visual inspection to exclude an MLCC flex crack; confirm with electrical or destructive analysis when symptoms warrant it.
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