W25N01GV 1Gbit (128MB) Serial NAND Flash Memory IC — SPI/QSPI, 3.3V, For Teensy 4.1

W25N01GV — 1Gbit (128MB) Serial NAND Flash Memory IC

The W25N01GV from Winbond is a 1Gbit (128MB) Serial NAND Flash memory IC — the most popular large-capacity flash choice for Teensy 4.1 external memory expansion, data logging, audio sample storage, and embedded file systems. Unlike NOR flash, NAND flash offers significantly higher density at lower cost per bit, making the W25N01GV the preferred choice when you need 128MB of non-volatile storage in a compact SOP-8 or WSON-8 package. It is fully supported by the LittleFS library on Teensy 4.1 and compatible with standard SPI and Quad SPI (QSPI) interfaces.

Key Specifications

Part Number	W25N01GV / W25N01GVZEIG / W25N01GVSFIG
Capacity	1Gbit = 128MB = 134,217,728 bytes
Interface	Standard SPI / Dual SPI / Quad SPI (QSPI)
Clock Frequency	Up to 104MHz (standard SPI)
Supply Voltage	2.7V – 3.6V
Page Size	2,048 bytes + 64 bytes spare
Block Size	128KB (64 pages per block)
Total Blocks	1,024 blocks
Endurance	100,000 erase/write cycles (minimum)
Data Retention	10 years (minimum)
ECC	Built-in 1-bit ECC (hardware)
Operating Temperature	−40°C to +85°C
Package	SOP-8 (SMD, 1.27mm pitch)
Manufacturer	Winbond Electronics

NAND vs NOR Flash — Which to Choose?

• NOR Flash (W25Q series): Random byte-addressable reads, execute-in-place (XIP), lower density — best for code storage and small data
• NAND Flash (W25N01GV, this): Higher density, lower cost per bit, sequential page reads — best for large data storage, file systems, audio samples, and data logging

Teensy 4.1 Memory Expansion

The W25N01GV is one of the supported external flash chips for Teensy 4.1 memory expansion. Install using the LittleFS library (by PaulStoffregen) available in the Arduino Library Manager. The chip solders to the dedicated flash pads on the underside of the Teensy 4.1 board. After installation, LittleFS presents the flash as a standard file system accessible via the SD-compatible API.

Typical Applications

• Teensy 4.1 external flash memory expansion (128MB file system)
• Audio sample and wavetable storage for synthesizers and audio projects
• Data logger storage for sensor arrays and IoT devices
• Embedded file system (LittleFS, SPIFFS) for ESP32 and STM32 projects
• Firmware update storage for OTA-capable embedded systems
• Large lookup table and asset storage for display projects

Package Contents

• 1 × W25N01GV 1Gbit Serial NAND Flash IC (SOP-8, Winbond)

W25N01GV Datasheet (Winbond PDF)

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