By RFID MFG Editorial Team · Updated June 15, 2026 · 2 min read
Why the chip matters
At 13.56 MHz the antenna and card body can be identical — the chip decides memory, speed, security and price. Picking the right chip prevents costly re-issues later, especially for access control and payment where security is non-negotiable.
Common HF/NFC chips compared
| Chip | Memory | Security | Best for |
|---|---|---|---|
| NTAG213/215/216 | 144–888 bytes | Basic, password | NFC tap, marketing, auth |
| MIFARE Classic 1K/4K | 1–4 KB | CRYPTO1 (legacy) | Access, loyalty, closed transit |
| MIFARE Ultralight | 48–192 bytes | Basic | Disposable tickets |
| MIFARE DESFire EV2/EV3 | 2–8 KB | AES, strong | Payment, transit, secure ID |
| ICODE SLIX | ~1 KB | Basic | Library, long-range HF |
NTAG (NFC)
NTAG chips are tuned for NFC phone interaction. They store a URL or vCard, can be locked, and are inexpensive — ideal for tap-to-engage marketing, product authentication and digital business cards.
MIFARE Classic
A long-standing workhorse for access control and closed-loop loyalty/transit. Its CRYPTO1 cipher is now considered legacy, so for new high-security projects DESFire is preferred.
MIFARE DESFire
DESFire EV2/EV3 adds AES encryption and a flexible file system, making it the modern choice for payment, public transit and government ID where security and multi-application support matter.
Ultralight and ICODE — tickets and libraries
Two more families round out the HF world. MIFARE Ultralight (and Ultralight EV1/C) is a low-cost, small-memory chip built for high-volume disposable use — single-ride transit tickets and event entry. NXP ICODE (SLIX/SLIX2, ISO 15693) offers longer HF read range and anti-collision, which is why it dominates library book tagging and some retail and healthcare applications where you scan a shelf of items at once.
Match the chip to your memory and security needs
Start from two questions: how much data must the tag hold, and how sensitive is it. For a URL or simple ID, NTAG213 (144 bytes) is plenty; for richer payloads or gaming, NTAG215 (504 bytes) and NTAG216 (888 bytes) give headroom. For access with legacy infrastructure, MIFARE Classic 1K/4K still fits; for anything touching money, identity or multiple applications on one card, choose DESFire EV2/EV3 with AES. Getting this right up front avoids a costly re-issue later.
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Frequently asked questions
Which RFID chip is most secure?
Among common HF chips, MIFARE DESFire EV2/EV3 is the most secure, using AES encryption and mutual authentication — suited to payment, transit and ID.
Which chip should I use for NFC marketing?
NTAG213/215/216 are the standard for NFC marketing and authentication: phone-readable, lockable and low cost. NTAG215 is popular for its 504-byte capacity.
What is the difference between NTAG213, 215 and 216?
They differ mainly in user memory: NTAG213 has 144 bytes, NTAG215 has 504 bytes and NTAG216 has 888 bytes. NTAG213 suits URLs and simple records; 215 and 216 suit richer data, vCards and gaming tokens.
Can you encode chips with our keys?
Yes — RFID MFG encodes MIFARE, DESFire and NTAG chips with your sectors, keys and data under NDA before delivery.