Chip Silk Marking
Espressif chip silk marking provides information such as chip name, flash size, and operating temperature.
Marking Convention
Chip Silk Marking Diagram
Pin 1: Position of Pin 1.
Espressif Logo: Company logo.
Product Name indicates the chip name.
Date Code: WW is the week number of year YYYY. Example: Date Code “122017” stands for the 12th week of year 2017.
- Flash Code is a code that indicates:
(Optional) Temperature and flash size.
The tracking information of the in-package flash.
The arrangement of the flash code can vary by product. Please see Flash Code and PSRAM Code Conventions for details.
- PSRAM Code is a code that indicates:
(Optional) Temperature and PSRAM size.
The tracking information of the in-package PSRAM.
The arrangement of the PSRAM code can vary by product. Please see Flash Code and PSRAM Code Conventions for details.
The second character of Espressif Tracking Information correlates to the chip revision. See the detailed mapping in ESP Chip Errata.
Flash Code and PSRAM Code Conventions
Based on the in-package flash or PSRAM, ESP32-C3 chips can be divided into the following categories.
No Flash, No PSRAM
This section applies to ESP32-C3 chips without any in-package flash or PSRAM. For such chips, flash code and PSRAM code are simply left empty.
Flash Code and PSRAM Code Diagram - No Flash, No PSRAM
In-package Flash, No PSRAM
This section applies to ESP32-C3 chips with only in-package flash. For such chips, only the flash code is used. PSRAM code is left empty.
Flash Code and PSRAM Code Diagram - In-package Flash, No PSRAM
- Temperature (2 characters)
FH: 105 °C
FN: 85 °C
This field is optional.
- Size (1 character)
2: 2 MB
4: 4 MB
8: 8 MB
This field is optional.
Flash Tracking Information (7 characters): This field is mandatory.
Note
ESP8685 uses 1 character (H or N), instead of 2 characters (FH or FN), to indicate the temperature.