Posts: 3
Registered: ‎06-09-2015

SiM3x chip marking meaning

Dear Silicon laboratories support team,


i would like to ask you to clarify the chip marking of SIM3x device. For an example, the picture below, what the numbers(1131BCS701TW) in the chip marking means?




Thank you!





Posts: 1,869
Registered: ‎10-14-2014

Re: SiM3x chip marking meaning

[ Edited ]

It is strange that both the RM and DS don't explain this mark.

The datasheet only mention the character in bold should be revision.

But I think this is very similar to the format in this KB:

You could create a ticket in our support portal for double confirm.


An interesting things I observed is that the revision information conflicted in your attached picture. I take a look at the datasheet and it seems there are 2 characters in the mark that indicate revision, but in your picture ('A' and 'B') it conflict each other.

My views are my own and do not necessarily represent the views of Silicon Labs

Posts: 1,869
Registered: ‎10-14-2014

Re: SiM3x chip marking meaning

I got below update:

The third line reads, in this example, “1031BCS701”.

  • The first 4 numbers represent the date code in YYWW format where YY = year, WW = work week. In this example, the device is dated 2011, work week 31.
  • The character after the date code, e.g. “B”, represents the device revision.
  • The 5 characters after the device revision, e.g. “CS701”, are trace code.

Please let me know if this answer your question.