How Long Do RFID Tags Last? Lifespan and Data Retention

Three lifetimes in every tag

For a passive tag the first two apply. For an active or BLE tag the battery usually comes first.

Lifetime 1: the chip's data retention and write endurance

Two figures describe a chip's memory. Data retention is the minimum time the maker guarantees that data written to the chip stays readable, at a stated temperature. Write endurance is the minimum number of times the memory can be rewritten. Neither is an expiry date. They are guarantees, and reading a tag uses up neither of them: only writing counts against endurance.

Three lessons follow from the table.

• Chips differ, even from one maker. Within Impinj's M700 series, the M730 and M750 are rated for 10,000 writes and 10 years, the M770 to M781 for 100,000 writes and 20 years. A label described only as "Impinj" or "NXP" does not tell you which; ask for the exact chip. Our Impinj vs NXP chip comparison covers the rest of their specifications.
• Heat shortens retention. The UCODE 9 data sheet gives 20 years at up to 55 °C, 10 years at up to 85 °C and 1 year at up to 125 °C. A tag that lives somewhere hot, on an engine, a kiln trolley or a sterilised tray, needs a chip and a housing rated for that temperature, not a figure quoted at room temperature.
• Endurance matters only if you rewrite. A retail label written once uses one cycle. A returnable crate re-encoded on every trip uses one a trip: even at 10,000 cycles, rewriting a tag every day would take more than 27 years to reach the rating.

Finished tags also carry ratings of their own, which can be more conservative than the chip's. Our UFLT-5610 laundry tag, for example, uses a UCODE 8 chip, and its specification lists "100,000 writes; 10-year data retention" for the tag. Plan to the finished tag's figure.

Lifetime 2: the housing, which is what usually fails

A passive tag stops working when its antenna, the bond between chip and antenna, or the thing holding it in place fails. The common causes:

• Adhesive. A label is made to stay where it was first applied. Heat, cold, dust and oily or textured surfaces shorten its hold, and a label peeled off and stuck elsewhere is rarely reliable.
• Abrasion and impact. Labels on cartons and crates scuff at the corners; hard ABS, PC or PCB tags exist for the places where labels wear away.
• Water, chemicals and washing. An IP rating and a wash rating tell you what the tag was built for. A tag not built for washing will not survive the laundry.
• Heat beyond the rating. The housing has an operating temperature range just as the chip has a retention temperature.
• Bending. Cards and flexible tags crack where the chip sits if they are folded or flexed often.

A tag that is mounted on metal or behind liquid and does not read has not worn out: it is detuned. Our troubleshooting guide explains how to tell the difference.

Lifespan by form factor, from our product specifications

These rows are copied from the specifications on each product page; they show what each tag is rated for and how it is priced.

The silicone laundry tag shows the whole point of this guide in one row: a chip rated for 50 years inside a housing rated for 200 washes or 3 years. The housing decides. For wristbands, the material decides the use: Tyvek for a single event, silicone for a season pass or a locker band. Cards follow the same logic: the chip outlasts the plastic, so keep cards in a holder if they are tapped many times a day.

Active and BLE tags: battery life

An active tag carries a battery and transmits on its own, which buys range at the cost of a finite life. Every battery figure on our product pages is stated with its conditions, because the life changes with how often the tag transmits and at what power:

• BLE asset tag ID-BLE-T01 on a CR2032 cell: up to 3 years at 0 dBm, transmitting every 10 seconds (₹1,250 + GST).
• Round IP68 BLE beacon ID-BLE-T03: 2.5 years at 0 dBm, transmitting every 500 ms, at 25 °C.
• Large BLE asset tag ID-BLE-X62 with a 2,700 mAh battery: 5 years at 0 dBm, transmitting every 10 seconds.
• AT508 2.4 GHz active tag: an ultra-low-power design with an average working current below 10 µA; its life depends on how often it transmits and the settings you use, so ask for an estimate for your configuration (₹1,177 + GST, minimum order 100 pcs).

Two rules of thumb follow from those rows: a tag set to transmit more often lasts less long, and a bigger battery lasts longer at the same settings. When you compare quotations, compare battery life at the same transmit power and interval. The full range is under BLE beacons and asset tags and active RFID tags and readers; passive vs active RFID explains when a battery is worth it.

How to specify tag life in a tender or purchase order

1. Describe the environment. Temperature range, washing (cycles, temperature, ironing or tunnel pressing), chemicals, outdoor exposure, and the surface the tag goes on.
2. State how often tags will be rewritten, so the chip's write endurance can be checked against it.
3. Ask for the chip by name and its data sheet, and read the data retention and write endurance at your temperature, not only at room temperature.
4. Ask for the finished tag's ratings: wash cycles, IP rating, operating temperature, and for active tags the battery life with its transmit power and interval.
5. Test with your own items and process. A short pilot, with tags read after real washes, real handling or real heat, is worth more than any table.
6. Read the warranty for what it covers. Ours is the warranty against manufacturing defects described on our terms page; wear from use beyond a tag's rating is a matter of choosing the right tag, which is what the steps above are for.

Related guides

• UHF tag memory: EPC, TID, user memory, lock and reuse
• RFID laundry and linen management
• How to choose on-metal RFID tags
• RFID wristband price guide