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: Specifies the chip name.

  • Product Specification is a code that indicates:

    • Operating temperature:

      • N = Up to 85 °C

      • H = Up to 105 °C

    • (Optional) Flash and PSRAM configuration:

      • F = In-package flash

      • R = In-package PSRAM

    • (Optional) Voltage level and interface:

      • No letter = 3.3 V Quad SPI

      • V = 1.8 V Octal SPI

      • W = 1.8 V Hex SPI

    • (Optional) Flash or PSRAM size.

    Examples:

    • NF4:

      The chip supports up to 85 °C operating temperature, and includes in-package 3.3 V Quad SPI flash (4 MB).

    • NR4:

      The chip supports up to 85 °C operating temperature, and includes in-package 3.3 V Quad SPI PSRAM (4 MB).

  • Manufacturing Code: Identifies the chip revision.

  • Espressif Tracking Information: Identifies the chip lot number.