## Understanding NFC Tag Types and Rewritability
NFC tags are based on RFID technology and come in various forms, primarily defined by the NFC Forum. The rewritability is intrinsically linked to the tag's memory type and access permissions.
**Common NFC Tag Types:**
* **Type 1 (e.g., Topaz):** These are often rewritable and can be locked to prevent further writing. They are cost-effective and suitable for simple applications.
* **Type 2 (e.g., NTAG213, NTAG215, NTAG216):** This is the most common series. They are fully rewritable until locked. The NTAG series from NXP is ubiquitous in marketing, product authentication, and interactive posters.
* **Type 3 (e.g., Sony FeliCa):** Based on the FeliCa system, these are typically pre-configured and not easily rewritable by end-users, often used in transit systems.
* **Type 4 (e.g., DESFire):** These operate like smart cards with higher security and memory. They are rewritable within the constraints of their complex file system and access controls.
* **Type 5 (e.g., ICODE SLIX):** Based on the ISO/IEC 15693 standard (HF RFID), these tags have a longer read range and are generally rewritable.
From a personal skill perspective, programming these tags requires understanding their unique commands. I've found that using a capable NFC-enabled smartphone or a dedicated writer like the ACS ACR122U is crucial. The process involves reading the tag's capabilities, writing new NDEF (NFC Data Exchange Format) messages, and optionally locking the tag to make it read-only—a decision that requires careful thought, as it is irreversible.
### Technical Parameters of Common Rewritable NFC Tags
The technical specifications determine a tag's suitability for a project. Here are detailed parameters for some popular rewritable NFC tag chips. *Please note: These technical parameters are for reference only. For preci
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