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Cracks other than MLCC

Views: 2846

#83739

Cracks other than MLCC | 13 November, 2019

Hello, I am a Japanese engineer. I am sorry for my unskillful English.

Have you ever encountered cracks in chip resistors or IC components due to board mechanical stress? Especially, I'm looking for a case in the PCBs Depaneling process(pizza cutter).

I have seen examples of MLCC cracks , but I want to know if other component may occur.

Thanks.

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#83742

Cracks other than MLCC | 13 November, 2019

I have seen resistors cracked during placement. The part was programmed incorrectly and the nozzle pushed down on the part too hard.

I do not remember seeing any cracked during depanelization.

Nibblers can cause damage if they are on the bottom and too close to the mouse bites.

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#83759

Cracks other than MLCC | 14 November, 2019

I've seen crack on resistor also.The crack on ICs mainly is on the solder joint due to very high strain.

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#83771

Cracks other than MLCC | 18 November, 2019

Review:

* Too much placement force

* Underside supports are set incorrectly

* Component height set incorrectly

* Downstroke location of either the pick or placement set incorrectly

* Nozzle that is smaller than recommended for the part

* Parts are already cracked

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#83773

Cracks other than MLCC | 18 November, 2019

The chip resistors are placed on the edge of the board, but the board has no or enough waste tabs. When de-panelizing, the bits may contact and break them. You can use a smt carrier, or add waste tabs in your next assembly manufacturing.

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#83774

Cracks other than MLCC | 19 November, 2019

Hi Trino,

I know some china's SMT company who may help you solve the problem you can visit their offical web and see if they can help you solve your problems. http://www.starivergroup.com

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