Authentication Flash

Security weaknesses in companion Flash memory to an MCU or SoC expose OEMs to the risk of product theft due to the cloning of reverse engineered PCB designs.

Authentication flash memory provides a secure handshake between the controller and the memory to ensure enhanced security of the data transmitted between two devices. These products in the W74M family come with standard HMAC-SHA-256 crypto accelerator and 4 separate Monotonic Flash Counters that are HMAC-signed (Hash-based Message Authentication Code) by individual secret keys.

Systems utilizing each Monotonic Flash Counter can not only verify the integrity and authenticity of the counter values, but also add a timestamp to the message/information transmitted as well as provide resistance to repeated attacks.

Block diagram of authentication flash

Block diagram of authentication flash

W74M products enable system designers to strengthen code/data storage as well as deliver increased security with multi-layered authenticity for emerging IoT devices on the edge and outside the cloud. These security products also provide enhanced security to gateways, sensors, doorbells, cameras and other similar devices in automotive, industrial, communication, and consumer applications.

Multi-layer authentication

Multi-layer authentication


Part No. Voltage Speed Temp. Features Status Industrial
Automotive Industrial
W74M25JV 2.7V - 3.6V 133MHz -40 ℃ ~ 85℃ Device and/or Module Authentication
Flash Command and Socket Compatible
S N* pdf
W74M25JW 1.7V - 1.95V 104MHz -40 ℃ ~ 85℃ Device and/or Module Authentication
Flash Command and Socket Compatible
UD N* pdf

Status:P= Mass Production, S= Samples, UD= Under Development, N= Not Recommended For New Design
All Winbond Flash products are "Green", Halogen-Free and RoHS compliant packaging. Refer to the datasheet for details and specifications.
N*:W74M25JV/JW can be replaced by W25R256JV/JW.


Technical Documentation


Contact us

Copyright © Winbond All Rights Reserved.

This website uses cookies to ensure you get the best experience on our website. Learn more