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DAC161P997: IC breakdown issue

Part Number: DAC161P997

Dear,

Please find attachment pdf 4-20mA loop. we found 10 out of 3 No. of dac breakdown after 1~2 day operation.

Can you give us assembly instruction for such IC ? Is there any chances if thermal pad or any other DAC4-20mA loop powered section.PDF pin is not solder properly or its floating..?