Feature: Consumer electronics


history. And without robust authentication, unauthorised or counterfeit tags can bypass protections. As industries face counterfeiting, unauthorised usage and strict


compliance requirements, the need for more secure NFC technology grows. Traditional NFC tags oſten lack advanced features, making them vulnerable to cloning, modification and data interception – a particular concern in critical applications where authenticity directly impacts safety and quality.


Example application: Consumer water filters Consumer water filters such as fridge filters are a good example for NFC use. Tese system rely on consumable components – i.e., water filters – that must be periodically replaced to maintain quality and safety. However, they face challenges like counterfeit consumables, lack of authentication mechanisms and insufficient tracking of usage or expiration. With an NFC-enabled design, for example by using the Analog


Devices’ MAX66301 NFC reader into the filter housing and MAX66250 NFC tag into the water filter cartridge, only authorised filters can be used. When a new filter is inserted, the NFC reader initiates a challenge-response authentication process with the tag. Upon successful authentication, the system validates the filter and allows water flow; see Figure 1. A key feature of water filter designs is the innovative use of a


cylindrical solenoid antenna that generates a toroidal NFC field, enabling robust communication between reader and tag. Tis toroidal field ensures reliable authentication on curved surfaces, eliminating the need for precise alignment between the reader and tag antennas. By wrapping the solenoid antenna around the cylindrical holder at a fixed distance from the cartridge’s NFC tag, the design allows seamless interaction regardless of the tag’s orientation. Te tag adds further functionality by supporting controlled tracking


of the product’s usage and expiration. Te 17-bit one-time settable, non-volatile decrement-only counter with authenticated read enables enforcement of expiration dates and tracking of usage; for example, the volume of water filtered. Secure EEPROM allows critical data storage, including the date of installation, first use and total usage history,


providing a comprehensive record for maintenance and replacement. Tis data is protected by cryptographic mechanisms, ensuring it can’t be tampered with or accessed by unauthorised parties. Te solution also minimises wear and tear in high moisture


environments, where traditional connections may degrade over time. Furthermore, the toroidal NFC field ensures consistent authentication performance without requiring precise alignment, greatly simplifying cartridge replacement for consumers. When a filter approaches its expiration or exceeds its safe usage


limits, the system can alert users through the refrigerator’s interface or a connected app. For critical scenarios the design can enforce bypassable blocking, preventing water flow until a valid filter is installed. Tis ensures that water quality is maintained whilst giving users the flexibility to replace filters as needed. Tis NFC-enabled system provides a significant advancement


in water filtration technology, ensuring safety, authenticity and ease of use.


Added security To manage the lifecycle of consumable products, the device also includes a 17-bit one-time settable, non-volatile decrement-only counter with authenticated read – meaning the counter value can only be accessed aſter successful authentication, preventing tampering or unauthorised resets. Historical usage tracking is reinforced with secure storage for sensitive data, 256 bits of secure EEPROM for user data, and cryptographic protection that blocks unauthorised access or data disclosure. Together, these features create a multilayered solution for authenticating, monitoring and managing critical applications that demand the highest security and integrity. In applications where security, safety and compliance are


essential, the MAX66301 and MAX66250 pairing (Figure 2) offers a comprehensive NFC solution for secure authentication, expiration control and usage tracking. Tis technology addresses unique vulnerabilities, ensuring product integrity and enhancing user safety. Tis NFC-enabled secure authentication system is poised to set new standards for secure, efficient operations in consumer electronics and many other industries.


Figure 2: MAX66301 and MAX66250 pairing


www.electronicsworld.co.uk July/August 2026 35


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