manufacturing date of RTC chip DS12c887+

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vks_foe

Joined Jan 11, 2009
61
I have a Dallas make RTC chip with integrated battery. But i'm not able to figure out its mfg date and how to plan for replacement. Apart from the chip no. I can see 2 numbers : "0904B" and "320425". Do these numbers provide any date of mfg? Further, can anyone tell me the shelf life of this chip
 

RichardO

Joined May 4, 2013
2,270
Here is an example of the markings on a Dallas part:

For a complete list of DS1804 ordering options or any other Dallas product, go to Tech Support and enter the parent part number (i.e., "DS1804").

Marking
Because of the size constraints with the package bodies, a package-specific methodology was devised. Components are marked with as much critical information as possible, while still maintaining some semblance of readability in the character set used.

For the package diagrams below, use the following key:

nnn 3-digit resistor value ("010" = 10kO, "050" = 50kO, "100" = 100kO)—DIP, µSOP, or Flip Chip
n 1 Roman numeral resistor value ("X" = 10kO, "L" = 50kO, "C" = 100kO)—SOIC only
yy Last 2 digits of year of assembly
ww Work week of assembly
s 1 character date code—Flip Chip only
rr Die revision code
### Last 3 digits of lot number
xx Up to 2 alpha characters of lot number suffix
cccccc Country where device is assembled
 
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