# How Does an RFID Card Work? The Tech Inside

URL: https://proudtek.com/blog/rfid-card-how-it-works/
Source URL: https://proudtek.com/blog/rfid-card-how-it-works/
Generated: 2026-03-16T01:42:30.697Z
Kind: article
Publisher: Proud Tek Co., Limited
Author: Peter Zhang (Founder & CEO)
Published: 2026-03-16T01:42:30.697Z
Last Modified: 2026-06-10T18:00:00Z
Reviewed By: Proud Tek Editorial Team
Last Reviewed: 2026-06-10T18:00:00Z
Credentials: ISO 9001:2015, ISO 14001:2015, RoHS Compliant, CE Marking, REACH Compliant
Image: https://proudtek.com/blog-images/rfid-card-how-it-works.jpg
Image Alt: Close-up of a contactless credit card reader, illustrating how RFID cards exchange data with point-of-sale terminals.

## Description
RFID cards look like ordinary plastic cards but contain a hidden antenna and microchip that communicate wirelessly with card readers.

## Summary
- RFID cards look like ordinary plastic cards but contain a hidden antenna and microchip that communicate wirelessly with card readers.

## Buyer Guidance
- Best for: How Does an RFID Card Work? The Tech Inside supports RFID and NFC evaluation, comparison, and sourcing decisions.
- Compare first: Compare How Does an RFID Card Work? The Tech Inside against reader compatibility, chip family, material, and deployment environment.
- What to confirm: Confirm target application, compatibility requirements, customization needs, quantity, and sample expectations before quoting How Does an RFID Card Work? The Tech Inside.

## FAQ
- Q: How long do RFID cards last?
  A: RFID cards have an extremely long lifespan because they contain no battery or moving parts. The microchip can endure over 100,000 read/write cycles. The PVC card body is the limiting factor, typically lasting 3-5 years under normal use (daily tapping, wallet storage, temperature exposure). With careful handling, RFID cards can function for 10+ years.
- Q: Can RFID cards be hacked or cloned?
  A: It depends on the chip type. Older chips like MIFARE Classic 1K use proprietary encryption that has been publicly broken, making them vulnerable to cloning with specialized equipment. Modern chips like MIFARE DESFire EV3 use AES-128 encryption that is considered secure against cloning with current technology. For security-sensitive applications, always specify a chip with current-generation encryption.
- Q: Do RFID cards stop working near magnets or phones?
  A: No. Unlike magnetic stripe cards, RFID cards are not affected by magnets, phone proximity, or static electricity. The chip stores data electronically in non-volatile memory, not magnetically. This is why hotels are migrating from magstripe to RFID key cards. RFID cards do not demagnetize from phone contact, which is the number one complaint about traditional hotel key cards.
- Q: Why do iPhone and Android phones read some RFID cards but not others?
  A: Smartphones contain NFC controllers that operate at 13.56 MHz HF only — the ISO 14443 / ISO 15693 / FeliCa stack. They cannot read 125 kHz LF proximity cards or 860-960 MHz UHF cards. So an iCLASS Seos badge, a MIFARE DESFire EV3 hotel key or a NTAG 213 NFC tag all read fine on a phone; an HID Prox 125 kHz access card or a Walmart UHF apparel tag does not. iPhones since iOS 13 (2019) support full NFC tag reading; Android has supported it since 5.0 (2014). For LF or UHF cards, you need a USB sled or BLE handheld reader.
- Q: Are NTAG 215, MIFARE Ultralight C, MIFARE Classic 1K and DESFire EV3 interchangeable for the same use case?
  A: No — they sit at very different security and memory tiers. NTAG 215 (504 bytes user memory, password protection only) is fine for tap-and-launch loyalty and product authentication where cloning isn't catastrophic. MIFARE Ultralight C (192 bytes, 3DES authentication) is a step up at low cost. MIFARE Classic 1K (1KB, broken Crypto-1 cipher) is suitable only when security doesn't matter; widely deployed historically but cloned with $20 of hardware. MIFARE DESFire EV3 (8KB+, AES-128, mutual auth) and NTAG 424 DNA (416 bytes, AES-128 SUN) are the secure floor for hotels, transit, payment and brand protection. Choose based on the data you need to store + whether cloning is a real threat in your application.

## Machine Routes
- JSON: https://proudtek.com/machine/blog/rfid-card-how-it-works.json
- Text: https://proudtek.com/machine/blog/rfid-card-how-it-works.txt