GD25Q128 16MB SPI NOR Flash Memory Module – 3.3V, 6-Pin Serial SPI Interface

Description

Overview

The UGE GD25Q128 SPI Flash Module is a compact non-volatile memory module based on the GigaDevice GD25Q128 128-Mbit SPI NOR Flash. It provides 16 MB of storage for embedded systems requiring additional program, configuration, data-logging or firmware storage.

The module exposes the SPI interface through a clearly labeled header, making it easy to connect to ESP32, STM32, Arduino, Raspberry Pi and other microcontroller or embedded platforms.

The onboard Flash device supports Standard SPI, Dual SPI and Quad SPI operation, allowing the module to be used for applications ranging from simple data storage to high-speed external memory.

Hardware design Schematic, pinout, setup instruction, example code:

GitHub Repository – UGE SPI 25Qxx Module

Key Features

• GigaDevice GD25Q128 SPI NOR Flash
• 128 Mbit / 16 MB non-volatile memory
• 3.3V operation
• Standard SPI interface
• Dual SPI support
• Quad SPI support
• High-speed SPI operation
• Low pin-count interface
• Onboard decoupling capacitor
• Power/status LED
• Clearly labeled SPI header
• Compact PCB design
• Four mounting holes
• Suitable for breadboard and custom PCB integration

Memory Specifications

Flash IC: GigaDevice GD25Q128
Memory Type: SPI NOR Flash
Density: 128 Mbit
Capacity: 16 MB
Operating Voltage: 2.7–3.6 V for the 3V GD25Q128 family
Interface: SPI / Dual SPI / Quad SPI
Page Size: 256 bytes
Sector Size: 4 KB
Block Erase: 32 KB / 64 KB
Data Retention: 20 years typical for the GD25Q128H variant
Endurance: 100,000 program/erase cycles minimum for the GD25Q128H variant

Pinout

Your onboard connector is clearly labeled:

3V3
FLASH_CS
FLASH_CLK
FLASH_MOSI
FLASH_MISO
GND

3V3
3.3V power supply for the Flash IC.

FLASH_CS
SPI chip-select / CS# signal.

FLASH_CLK
SPI clock / SCLK.

FLASH_MOSI
SPI data input / MOSI.

FLASH_MISO
SPI data output / MISO.

GND
Ground.

For Quad SPI applications, the additional Flash I/O signals are available at the Flash IC but are not broken out on your 6-pin header as shown in the photo. Therefore, I would advertise the module primarily as a 6-pin SPI interface module, while mentioning Quad SPI as an IC capability rather than implying that all four data lines are externally accessible.

Typical Connection

For a conventional MCU SPI connection:

Flash Module       MCU

3V3       -------- 3.3V
GND       -------- GND
FLASH_CS  -------- GPIO / CS
FLASH_CLK -------- SPI SCLK
FLASH_MOSI -------- SPI MOSI
FLASH_MISO -------- SPI MISO

The chip-select line can be assigned to any suitable GPIO on the host MCU.

Applications

• External MCU data storage
• Configuration storage
• Firmware storage
• Bootloader storage
• Parameter storage
• Calibration data
• Data logging
• Industrial controllers
• ESP32 projects
• STM32 projects
• Arduino projects
• Embedded Linux systems
• External filesystem storage
• Graphics/font/image storage
• Firmware update storage
• SPI memory expansion

The GD25 family is intended for embedded applications requiring compact, low-pin-count non-volatile storage and supports standard, dual and quad SPI interfaces.

Compatibility

The module can be used with platforms supporting 3.3V SPI, including:

• ESP32
• ESP8266
• STM32
• RP2040
• Arduino 3.3V boards
• Raspberry Pi
• Other 3.3V MCUs and processors

For 5V microcontrollers, the host system should provide appropriate 3.3V logic-level compatibility/translation rather than connecting 5V GPIO signals directly to the Flash device.

Technical Specifications

*Maximum frequency depends on the exact GD25Q128 device/revision installed.

What’s Included

• 1 × UGE GD25Q128 16MB SPI Flash Module

The module is supplied assembled with the GD25Q128 Flash IC, decoupling components and interface header.