Chip Silk Marking

Espressif chip silk marking provides information such as chip name, flash size, and operating temperature.

Marking Convention

Diagram showing chip marking information — 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-S3 chips can be divided into the following categories.

No Flash, No PSRAM

This section applies to ESP32-S3 chips without any in-package flash or PSRAM. For such chips, flash code and PSRAM code are simply left empty.

In-package Flash, No PSRAM

This section applies to ESP32-S3 chips with only in-package flash. For such chips, only the flash code is used. PSRAM code is left empty.

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.

In-package PSRAM, No Flash

This section applies to ESP32-S3 chips with only in-package PSRAM. For such chips, only the PSRAM code is used.

Size (2 characters)
- R2: 2 MB
- R8: 8 MB
This field is optional.
PSRAM Tracking Information (9 characters): This field is mandatory.

Note

ESP32-S3R8V and ESP32-S3R16V have an additional character (V) between the Size field and PSRAM Tracking Information field, indicating that this is a 1.8 V PSRAM.

In-package Flash, In-package PSRAM

This section applies to ESP32-S3 chips with both in-package flash and PSRAM. For such chips, both flash code and PSRAM code are used.

Temperature (1 character)
- H: 105 °C
- N: 85 °C
This field is optional.
Flash Size (1 character)
- 4: 4 MB
- 8: 8 MB
This field is optional.
PSRAM Size (2 characters)
- R2: 2 MB
- R8: 8 MB
This field is optional.
Flash Tracking Information (7 characters): This field is mandatory.
PSRAM Tracking Information (9 characters): This field is mandatory.

Note

For ESP32-S3FH4R2, the Flash/PSRAM Code line is FH4R2;
For ESP32-S3-PICO-1-N8R2, the Flash/PSRAM Code line is N8R2;
For ESP32-S3-PICO-1-N8R8, the Flash/PSRAM Code line is N8R8.