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The Frequently Asked Questions about Radio Frequency IDentification, and generally on RFID Tags and Readers

What is RFID? What are RFID Tags?

Do RFID Tags need power supply?

How can I write RFID Tags?

How long do RFID Tags store information?

What Temperature is needed for RFID Tags to work properly?

Can RFID Tags be rewritten? How many times?

Can RFID Tags be blocked, in order to make them NOT rewritable?

What are the differences between NFC and RFID?

What is RFID? What are RFID Tags?

RFID stands for Radio-Frequency IDentification. Means a technology for the automatic identification and / or storage of information relating to objects, animals or persons based on the storage capacity of data by particular electronic labels and the ability to these to answer the remote query by special fixed or portable devices, called readers. RFID tags are microchips with an antenna, which can contain information and be read in a simple and fast way

Do RFID Tags need power supply?

RFID tags can be of three types: passive, semi-active or active. Passive tags do not have any internal power sources and they get the power needed to activate the circuits from the radio waves sent by the reader who interrogates them and induces a current in the antenna. Semi-active tags have a power source, but it does not need to power the radio circuits, but additional functions such as temperature or motion sensors. Active tags are best suited to tracing valuable goods over long distances by having a battery

How can I write RFID Tags?

RFID tags can be programmed with a desktop computer program.

How long do RFID Tags store information?

Forever. Or at least until they are destroyed or damaged. Information can be rewritten but also protected or encrypted.

What Temperature is needed for RFID Tags to work properly?

All RFID tags sold on RFIDtrade are guaranteed for use at temperatures between -25 and 80 ° C, unless otherwise indicated. There are Washable Tags and Industrial Tags, which are designed to withstand higher temperatures. Exceeding the thresholds may, however, cause chip failure.

Can RFID Tags be rewritten? How many times?

All RFID tags can be rewritten by default. Potentially, RFID tags can be rewritten indefinitely. They are guaranteed, depending on the models, for a duration of 20 to 50 years and to be rewritten from 10,000 up to 100,000 times. Of course, it is also possible to lock them, so they will not be rewritten.

Can RFID Tags be blocked, in order to make them NOT rewritable?

Yes, RFID tags can be blocked. RFID tags that are blocked can not be overwritten. Some chips can be locked with a password: this means that you need to know the password to be rewritten.

 What are the differences between NFC and RFID?

NFC and RFID are both wireless technologies. NFC has a less wide range and is used for secure applications, including payment, or for marketing. RFID, on the other hand, has a longer range, supports minimal security, and is used for very simple applications.

  • LF (low frequencies): 125 kHz - 134,2 kHz
  • HF (high frequencies) o NFC: 13.56 MHz
  • UHF (ultra high frequencies): 860 MHz - 960 MHz
  • SHF (super high frequencies): 2.45 GHz

NFC technology is the one that operates at 13.56 MHz frequency and is the only RFID to be compatible with NFC-equipped phones. LF and HF frequencies have a few centimeter operating radius, while UHF and SHF frequencies have a wider range of up to several meters.