W25Q512JV 512Mbit (64MB) SPI NOR Flash Memory IC — SOIC-8 / WSON-8, 133MHz, 3.3V

W25Q512JV 512Mbit (64MB) SPI NOR Flash Memory IC — Winbond

The Winbond W25Q512JV is a high-density 512Mbit (64MB) SPI NOR Flash memory IC combining large non-volatile storage capacity with a fast, flexible serial interface. Operating from a 2.7V–3.6V supply at up to 133MHz SPI clock (266MB/s effective in Quad SPI mode), it delivers execute-in-place (XIP) capability, byte-level random read access, and 100,000 write/erase cycles per sector — making it the preferred choice for embedded firmware storage, OTA update buffers, and large asset repositories in space-constrained designs.

Compatible with the Teensy 4.1 external flash footprint, ESP32, STM32, RP2040, and virtually any microcontroller with an SPI or QSPI peripheral. The W25Q512JV supports standard SPI, Dual SPI, and Quad SPI modes — allowing you to trade off compatibility vs. throughput depending on your MCU’s capabilities.

Key Specifications

Parameter	Value
Capacity	512Mbit (64MB / 67,108,864 bytes)
Technology	NOR Flash (byte-addressable)
Interface	Standard SPI / Dual SPI / Quad SPI (QSPI)
Max SPI Clock	133MHz (standard SPI)
Max Quad SPI Throughput	266MB/s (133MHz × 4 data lines)
Supply Voltage	2.7V – 3.6V (3.3V nominal)
Standby Current	1µA typical
Active Read Current	4mA typical
Page Size	256 bytes
Sector Size	4KB (smallest erasable unit)
Block Size	64KB
Write Endurance	100,000 cycles per sector
Data Retention	20 years
Execute-in-Place (XIP)	Yes (NOR Flash, byte-addressable)
Package	SOIC-8 (1.27mm pitch) / WSON-8 (6×5mm)
Operating Temperature	-40°C to +85°C
Manufacturer	Winbond Electronics
RoHS Compliant	Yes

NOR Flash vs NAND Flash — Which Do You Need?

Feature	NOR Flash (W25Q512JV)	NAND Flash (W25N02)
Random Read Access	✅ Fast, byte-addressable	⚠️ Page-based (slower random)
Execute-in-Place (XIP)	✅ Yes — code can run directly	❌ No
Write/Erase Speed	Moderate	Faster (larger pages)
Capacity Range	Up to 64MB	Up to 256MB+
Best For	Firmware, bootloaders, code storage	Data files, logs, LittleFS
Bad Block Management	Not required	Required (ECC/BBM)

Why Choose the W25Q512JV?

• 64MB in a tiny SOIC-8 footprint — the largest capacity in the W25Q series, fitting the same 8-pin package as smaller chips
• Execute-in-Place (XIP) — NOR Flash allows code to be executed directly from the chip via QSPI, extending MCU program memory without copying to RAM
• 133MHz Quad SPI — 266MB/s effective throughput for fast firmware loading and asset streaming
• Ultra-low standby current (1µA) — negligible power draw in battery-powered and IoT applications
• 100,000 write cycles — suitable for OTA firmware updates, configuration writes, and moderate-frequency data logging
• Industry-standard W25Q pinout — drop-in compatible with W25Q256, W25Q128, and other W25Q series chips
• Wide MCU compatibility — works with Teensy 4.1, ESP32, ESP8266, STM32, RP2040, nRF52840, and any SPI-capable MCU

Compatible Platforms

Platform	Use Case	Interface Mode
Teensy 4.1	External flash footprint (bottom of board)	QSPI (built-in support)
ESP32 / ESP32-S3	External flash expansion via QSPI	Quad SPI
STM32 (QSPI peripheral)	Firmware + data storage, XIP	Quad SPI
RP2040 (Raspberry Pi Pico)	Program flash replacement/expansion	QSPI
Arduino (SPI)	Data/file storage via SPIFlash library	Standard SPI

Typical Applications

• Teensy 4.1 external program and data flash expansion
• ESP32 / STM32 firmware storage and OTA update buffer
• LittleFS / SPIFFS / FAT file system storage
• Bootloader and multi-partition firmware storage
• Large lookup table, font, and bitmap asset storage for display projects
• Audio sample and waveform storage for synthesizer and audio projects
• Configuration and calibration data non-volatile storage
• Data logger storage for IoT sensor nodes

Frequently Asked Questions

Q: Is the W25Q512JV compatible with the Teensy 4.1 external flash footprint?

Yes. The Teensy 4.1 has a dedicated SOIC-8 footprint on the bottom of the board for external flash. The W25Q512JV fits this footprint directly. Solder before installing header pins for easier access. The Teensy 4.1 bootloader and LittleFS library support the W25Q512JV natively.

Q: Can I execute code directly from this flash chip (XIP)?

Yes — NOR Flash supports execute-in-place. On platforms like STM32 and RP2040 with QSPI memory-mapped mode, the W25Q512JV can be mapped into the MCU’s address space and code can run directly from it. On Teensy 4.1, external flash is used for data storage (LittleFS), not direct code execution.

Q: What is the smallest erasable unit?

The smallest erasable unit is a 4KB sector. Individual bytes can be read or programmed (written from 1→0), but erasing (0→1) requires erasing the entire 4KB sector. Plan your file system or data layout accordingly to minimize unnecessary erase cycles.

Q: How does W25Q512JV compare to W25Q256?

The W25Q512JV has 4× the capacity (64MB vs 16MB) in the same SOIC-8 package with the same pinout. It is a drop-in upgrade for designs using W25Q256 or smaller W25Q series chips, provided the host MCU’s flash driver supports 4-byte addressing (required for capacities above 16MB).

Q: Does this work with the Arduino SPIFlash / SerialFlash library?

Yes. The W25Q512JV is compatible with the Adafruit SPIFlash and SerialFlash libraries for Arduino. Ensure your library version supports 4-byte addressing for full 64MB access. The chip’s JEDEC ID (EF 40 20) is recognized by most SPI Flash libraries.

Package Contents

• 1× Winbond W25Q512JV SPI NOR Flash IC (SOIC-8 or WSON-8)

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