SKU: TH2104
This Adafruit W25Q16 QSPI Flash Breakout is built around the Winbond W25Q16JVSSIQ, a 16 Mbit (2 MB) external QSPI flash memory commonly used for firmware, assets, and data storage in modern microcontroller designs. It breaks out the 8-SOIC QSPI flash into a 0.3″ DIP form factor, making it easy to prototype and socket high-speed quad-SPI flash with MCUs like RP2040, ESP32, and STM32.
The W25Q16JVSSIQ supports single, dual, and quad SPI modes at up to 133 MHz, operates at 3.3 V logic, and provides fast read performance for execute-in-place (XIP) applications. Ideal for testing flash sizes, firmware storage, and adding external non-volatile memory without designing a custom PCB.
Technical details for Adafruit W25Q16 QSPI Flash Breakout - 16Mbit 2MB.
| Specification | Details |
|---|---|
| Flash IC | Winbond W25Q16JVSSIQ |
| Memory Capacity | 16 Mbit (2 MByte) |
| Memory Type | Serial NOR Flash |
| Interface | SPI / Dual SPI / Quad SPI (QSPI) |
| Maximum Clock Frequency | Up to 133 MHz (QSPI mode) |
| Operating Voltage | 3.0 V – 3.6 V (3.3 V nominal) |
| Execute In Place (XIP) | Supported |
| Package Type | 8-SOIC (mounted on breakout) |
| Breakout Form Factor | 0.3″ DIP, breadboard compatible |
| Erase Types | Sector, Block, and Chip Erase |
| Endurance | 100,000 program/erase cycles per sector |
| Data Retention | 20 years |
| Typical Applications | Firmware storage, assets storage, external MCU flash, prototyping |
| 3V | 3.3V power supply |
|---|---|
| CS | Chip Select (active low) |
| IO3 | QSPI IO3 / HOLD# (unused in SPI mode) |
| IO1 | QSPI IO1 / MISO |
| CLK | SPI / QSPI clock |
| IO2 | QSPI IO2 / WP# (unused in SPI mode) |
| IO0 | QSPI IO0 / MOSI |
| G | Ground |
This breakout uses the Winbond W25Q16JVSSIQ, which provides 16 Mbit of serial NOR flash memory, equal to 2 MByte. It is intended for storing firmware, assets, and other external data.
It is aimed at 3.3V microcontroller platforms that use external SPI or QSPI flash, including families such as RP2040, ESP32, RT10xx, and STM32. It should only be used with 3.3V logic and power.
No. The board is only for 3.3V power and logic, and the guide specifically says not to use it with a 5V board like an Arduino Uno.
Yes, the W25Q16JVSSIQ supports SPI, Dual SPI, and Quad SPI operation. The Quad Enable bit is permanently set, so it is ready to use in QSPI mode out of the box.
For a typical 3.3V setup, connect 3V to 3.3V, G to ground, IO0 to MOSI, IO1 to MISO, and CLK to the clock pin. In SPI mode, the IO2 and IO3 pins do not act as write-protect and hold in normal use, so the guide says to connect them to 3.3V.
The board converts the 8-SOIC flash chip to a 0.3 inch wide DIP form factor for prototyping. It is designed to work on a breadboard, and a small strip of header is included for soldering.
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