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SN74HC573A: SN74HC573AN was found oxidized.

Part Number: SN74HC573A

Hi TI Folks,

  Good day to you.

  TI MPN SN74HC573AN was found oxidized in production, see the body marking in below photo. I can find the its MSL and soldering spec in TI website. Please share these information and advise what's the cause of oxidized.

Solder status is as below, quality is no good:

Best regards

Jiang WeiJi