What is W25Q128JVSIQ Serial Flash Memory?

20 November 2023

Ⅰ. W25Q128JVSIQ overview

Ⅱ. Manufacturer of W25Q128JVSIQ

Ⅲ. Symbol, footprint and pin configuration of W25Q128JVSIQ

Ⅳ. Features of W25Q128JVSIQ

Ⅴ. Working principle of W25Q128JVSIQ

Ⅵ. Technical parameters of W25Q128JVSIQ

Ⅶ. Advantages and disadvantages of W25Q128JVSIQ

Ⅷ. Absolute maximum ratings of W25Q128JVSIQ

Ⅸ. Applications of W25Q128JVSIQ

Ⅰ. W25Q128JVSIQ overview


W25Q128JVSIQ is a high-speed flash memory produced by Winbond Company. It communicates using the SPI (Serial Peripheral Interface) protocol, has a clock speed of up to 104MHz, and has a memory capacity of 128Mb. It has high storage density, fast reading and writing speed, and high reliability, so it is suitable for various embedded systems and application scenarios, such as smart home, industrial control, automotive electronics, etc. In addition, it has low power consumption, automatic sleep and wake-up functions to optimize system power consumption.

Replacements and equivalents:

• IS25LQ025B

• MX25L12835F




• W25Q128JVSJQ

Ⅱ. Manufacturer of W25Q128JVSIQ

W25Q128JVSIQ is manufactured by Winbond Electronics Corp.. Winbond Electronics Corp. was founded in Hsinchu Science Industrial Park in 1987. It is a niche company specializing in the design, manufacturing and sales of memory ICs. It provide mid- to low-density niche memory solution services from product design, technology research and development, wafer manufacturing to private brand marketing worldwide. Winbond's products include specialty DRAM, mobile DRAM and code storage flash memory.

Ⅲ. Symbol, footprint and pin configuration of W25Q128JVSIQ

The following figure shows the symbol, footprint and pin configuration of W25Q128JVSIQ respectively.


Ⅳ. Features of W25Q128JVSIQ

• Single 2.7 to 3.6V power supply

• 40°C to 85°C operating temperature range

• Sequential reads in 8/16/32/64 byte packages

• New series of SPI flash memory

• Only 8 clocks are needed to address memory

• Highest performance serial flash memory

• 133MHz single, dual/quad channel SPI clock

• 66/532MHz equivalent dual/quad channel SPI

• Allows true XIP (Execution in Place) operation low power consumption, wide temperature range

• Four-channel SPI: CLK, /CS, IO0, IO1, IO2, IO3

Ⅴ. Working principle of W25Q128JVSIQ

Memory structure: W25Q128JVSIQ consists of multiple sectors and blocks, and one or more device-specific block erase areas. Each sector typically contains a smaller block of data, and each block may contain one or more sectors. Memory is divided into pages, usually measured in bytes. This organizational structure allows data to be read, written, and erased in smaller units.

SPI interface: The chip communicates with the microcontroller or other master control device through SPI (Serial Peripheral Interface). SPI is a synchronous serial communication protocol, including clock line (SCLK), input line (MISO), output line (MOSI) and chip select line (CS). Through the SPI interface, the master control device can send commands to the W25Q128JVSIQ to perform operations such as reading, writing, and erasing.

Read operation: The master control device sends a read command through the SPI interface, specifying the address and data length to be read, and then W25Q128JVSIQ will transmit the data to the master control device bit by bit through the MISO line according to the requested data length.

Write operation: Data is written through the SPI interface. Usually, a write operation requires sending a write enable command first, and then sending a write command and data. The data written can be single bytes, pages or sectors.

Erase operation: The erase operation is the process of setting the entire sector or block of data to its initial state. Before erasing, we usually need to send an erase enable command and specify the sectors or blocks to be erased.

Protection and locking: W25Q128JVSIQ supports protection and locking of storage areas to prevent accidental writing or erasing. We can set and clear these protection bits by sending the corresponding commands.

Ⅵ. Technical parameters of W25Q128JVSIQ


Ⅶ. Advantages and disadvantages of W25Q128JVSIQ

1. Advantages of W25Q128JVSIQ

(1) Automatic sleep and wake-up function: It has automatic sleep and wake-up function, which can optimize the system power consumption and improve the energy-saving performance of the system.

(2) Low power consumption: W25Q128JVSIQ has low power consumption, which helps to reduce the power consumption of the system, thus extending the service life of the system.

(3) High reliability: The W25Q128JVSIQ employs advanced flash memory technology, characterized by superior reliability and stability, ensuring the integrity and dependability of data.

(4) High storage density: Its storage capacity is 128Mb (16MB), which can meet the storage needs of large amounts of data.

(5) Fast reading and writing speed: It uses SPI interface to support high-speed reading and writing, with a maximum clock frequency of up to 104MHz, giving it excellent performance when processing large amounts of data.

2. Disadvantages of W25Q128JVSIQ

(1) Programming delay: It requires a certain time delay when programming flash memory, which may have a certain impact on system performance.

(2) Higher price: Compared with some other memories, the price of W25Q128JVSIQ may be higher, which may increase the cost of the system.

(3) Speed limit: Although it has high read and write speeds, it may still be speed limited when processing large amounts of data.

(4) Limited number of erasing and writing times: Flash memory has a limited number of erasing and writing times, which may cause the stored data to be lost or unreliable after a period of time.

Ⅷ. Absolute maximum ratings of W25Q128JVSIQ



1. This device has been designed and tested for the specified operation ranges. Proper operation outside of these levels is not guaranteed. Exposure to absolute maximum ratings may affect device reliability. Exposure beyond absolute maximum ratings may cause permanent damage.

2. Compliant with JEDEC Standard J-STD-2OC for small body Sn-Pb or Pb-free (Green) assembly and the European directive on restrictions on hazardous substances (RoHS) 2002/95/EU

3. JEDEC Std JESD22-A114A (C1=100pF, R1=1500 ohms, R2=500 ohms)

Ⅸ. Applications of W25Q128JVSIQ

• Automotive electronics: It is an important part of the storage unit of the automotive electronic control unit and is used to store key data such as vehicle control logic, sensor data and fault diagnosis information.

• Industrial control: W25Q128JVSIQ can be used as a program storage device in the storage system to store the program code of the control system to ensure the stable operation of the system.

• Embedded system storage: W25Q128JVSIQ can be used as the main memory in embedded systems to store program code, firmware and other data. Its large capacity and fast read and write speed make it suitable for various embedded applications, such as microcontrollers, embedded processors and other embedded systems.

• Smart home: In addition, it can also be used as a data storage device in the storage system to store various information in the home network, such as audio, video, pictures, etc.

• Network devices: In network devices, W25Q128JVSIQ can be used to store firmware, configuration files and other important data. For example, devices such as routers, switches, network interface cards, etc. may use this flash memory to store operating systems and related software.

Frequently Asked Questions

1. Does the W25Q128JVSIQ have a hardware write protection feature?

Yes, the W25Q128JVSIQ has a hardware write protection feature that allows you to protect specific blocks or the entire chip from being written to.

2. What is the operating temperature range of W25Q128JVSIQ?

The operating temperature of W25Q128JVSIQ ranges from -40°C to 85 °C.

3. What is the capacity of the W25Q128JVSIQ Flash memory chip?

The W25Q128JVSIQ has a capacity of 128 megabits (Mb), which is equivalent to 16 megabytes (MB).

4. What are some common applications for the W25Q128JVSIQ Flash memory?

The W25Q128JVSIQ is commonly used in various applications such as automotive, industrial, consumer electronics, networking, and more for data storage and code execution purposes.

5. What is the purpose of SPI flash memory?

SPI flash memory, also known as flash memory, has become widely used in the embedded industry and is commonly used for storage and data transfer in portable devices. Common devices include phones, tablets, and media players, as well as industrial devices such as security systems and medical products.