Chip Silk Marking

[中文]

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.

  • Product Specification is a code that indicates:

    • Operating temperature, e.g., “N” stands for 85 °C and “H” stands for 105 °C.

    • (Optional) Whether the chip includes flash and PSRAM, e.g., “F” stands for in-package flash and “R” stands for in-package PSRAM.

    • (Optional) Interface voltage level. The default is 3.3 V Quad SPI. “V” stands for 1.8 V Octal SPI and “W” stands for 1.8 V Hex SPI.

    • (Optional) Size of flash and PSRAM.

    Examples:

    • The code “NRW16” means the chip operates at 85 °C, has in-package 1.8 V Hex SPI PSRAM, and the PSRAM size is 16 MB.

    • The code “NR4” means the chip operates at 85 °C, has in-package 3.3 V Quad SPI PSRAM, and the PSRAM size is 4 MB.

  • Manufacturing Code indicates the chip revision. See the detailed mapping in ESP Chip Errata.

  • Espressif Tracking Information indicates the chip lot.