What temperature can an NFC tag survive?
The limiting part is rarely the chip. Adhesive softens, plastic film deforms and paper faces delaminate long before the silicon reaches its own limit. Tags rated for extreme temperatures exist, and what they change is mostly the packaging rather than the electronics.
Three layers, three limits
A tag is silicon, an antenna and a carrier held together by adhesive. Each fails at a different point, and the tag as a whole fails at the lowest of the three.
Silicon and the bond connecting it to the antenna tolerate a wide range. The printed aluminium antenna tolerates a wide range too, until thermal expansion cracks it. Adhesive and substrate are the weak links in almost every real failure.
Manufacturers publish operating and storage ranges for their chips, and the figures vary between families, so a specific tag needs its own datasheet rather than a general number.
Cold
Cold is easier than heat, with two caveats.
Adhesive stops adhering. Standard sticker adhesive applied at room temperature and then chilled will let go, which is why cold chain deployments use adhesives specified for the application temperature as well as the storage temperature.
And condensation on the way back to room temperature brings water into contact with the tag repeatedly, which is a durability problem rather than a temperature one.
Reading in the cold is generally fine. A tag that has been in a freezer reads normally when the phone reaches it.
Heat
Heat is where tags actually die, and it does not take an industrial oven.
A car dashboard in summer reaches temperatures that soften ordinary adhesive and deform thin film. Laminating a tag with a hot press can destroy it. A tag applied before a paint curing cycle or a dishwasher run is unlikely to survive it.
The failure is usually mechanical rather than electronic: the antenna cracks, or the bond between chip and antenna separates. The chip is often intact and completely useless.
How to specify
Give the supplier the whole thermal history, not the operating temperature. Where is the tag applied, at what temperature, what does it go through during manufacture or assembly, and what does it experience in service.
The processing step is what gets forgotten. A tag rated comfortably for its working environment can be destroyed by a single lamination or curing step nobody mentioned, and that failure appears at the end of a production run rather than in a sample.
And test a sample through the real process rather than through a description of it. This is the cheapest insurance available in any tag deployment.
Frequently asked questions
Can NFC tags go through a dishwasher?
Ordinary stickers will not survive repeated cycles, between the heat, the water and the detergent. Encapsulated tags designed for laundry and washing exist and are the right choice.
Does cold reduce read distance?
Not appreciably. Cold affects the tag's survival rather than its performance, and a chilled tag reads much as a warm one does.
Will a tag survive a car in summer?
The chip probably will and the adhesive may not. Tags for automotive use exist, and for a dashboard the more common failure is the tag peeling off rather than the electronics dying.
What about a tag inside a laminated card?
Cards are manufactured with the inlay laminated in, using a process the inlay is specified for. Laminating an ordinary sticker yourself with a hot pouch laminator is a different matter and frequently destroys it.