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MSP430F2618: Crack under solder reflow

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Part Number:MSP430F2618

We have 600pcs MSP430F2618TPNR surface mount on  our PCB under solder reflow, and we found there are about 20pcs MSP430F2618TPNR cracked. 

I'm not sure what cause this. These MCUs is made at the year 2009, but the Moisture Barrier Dry Packing is good.


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