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I have a 4PIN dip octocoupler that’s cracked on the board of a power supply I’m fixing.

The markings on the optocoupler are CT 817C 953K

What does the 953K mean? Is it a manufacturing batch number?

Thanks in advance!

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According to CT817C datasheet from CT Micro:

  • 9 = Fiscal Year
  • 53 = Work Week
  • K = Manufacturing Code
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