{"product_id":"rfid-cards-1356mhz-mifare-classic-pack-of-5-for-mfrc522","title":"RFID Cards 13.56MHz MIFARE Classic – Pack of 5 for MFRC522","description":"\u003ch1\u003eRFID Cards 13.56MHz MIFARE Classic – Pack of 5 for MFRC522\u003c\/h1\u003e\n\n\u003cp class=\"product-lede\"\u003eThese 13.56MHz MIFARE Classic RFID cards come in a pack of five, designed to work seamlessly with the popular MFRC522 reader module for Arduino, ESP32, and Raspberry Pi projects.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable class=\"specs-table\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eFrequency\u003c\/th\u003e\n\u003ctd\u003e13.56 MHz\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eProtocol\u003c\/th\u003e\n\u003ctd\u003eISO 14443A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eChip\u003c\/th\u003e\n\u003ctd\u003eMIFARE Classic 1K\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMemory\u003c\/th\u003e\n\u003ctd\u003e1 KB (16 sectors × 4 blocks)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eData Retention\u003c\/th\u003e\n\u003ctd\u003e10 years\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eWrite Endurance\u003c\/th\u003e\n\u003ctd\u003e~100,000 cycles\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eRead Range\u003c\/th\u003e\n\u003ctd\u003eUp to 10 cm (with MFRC522)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eDimensions\u003c\/th\u003e\n\u003ctd\u003e85.6 × 54 mm (CR80)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-arduino-rfid-door-lock\"\u003e\n\u003cstrong\u003eRFID Door Lock:\u003c\/strong\u003e Use an Arduino Uno with MFRC522 to unlock a door when a matching card is scanned.\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/rfid-attendance-system-kit-log-cards-to-sd-python-weekly-reports\"\u003e\n\u003cstrong\u003eIoT Attendance Logger:\u003c\/strong\u003e Log student attendance by scanning RFID cards and send data to a cloud spreadsheet via ESP32.\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLibrary Self-Checkout:\u003c\/strong\u003e Build a kiosk with Raspberry Pi and RFID to track borrowed books in real time.\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/rfid-attendance-system-kit-log-cards-to-sd-python-weekly-reports\"\u003e\n\u003cstrong\u003eSmart Classroom Attendance:\u003c\/strong\u003e An RFID-based attendance recorder for CBSE practicals or ATL Tinkering Lab demonstrations.\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/learn-authentication-build-an-rfid-access-control-system-kit-with-arduin\"\u003e\n\u003cstrong\u003eMulti-factor Authentication:\u003c\/strong\u003e Combine RFID card scan with PIN entry on ESP32 for a secure access control system.\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003ctable class=\"compat-table\"\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePlatform\u003c\/th\u003e\n\u003cth\u003eCompatible\u003c\/th\u003e\n\u003cth\u003eConnection\u003c\/th\u003e\n\u003cth\u003eLibrary \/ Method\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Uno R3\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eSPI via MFRC522\u003c\/td\u003e\n\u003ctd\u003eMFRC522 library\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Nano\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eSPI via MFRC522\u003c\/td\u003e\n\u003ctd\u003eMFRC522 library\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Mega 2560\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eSPI via MFRC522\u003c\/td\u003e\n\u003ctd\u003eMFRC522 library\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP8266 NodeMCU\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eSPI via MFRC522\u003c\/td\u003e\n\u003ctd\u003eMFRC522 library\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP32 Dev Board\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eSPI via MFRC522\u003c\/td\u003e\n\u003ctd\u003eMFRC522 library\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi Pico\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eSPI via MFRC522\u003c\/td\u003e\n\u003ctd\u003eMFRC522-pico library\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi 4 \/ 5\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eSPI via MFRC522\u003c\/td\u003e\n\u003ctd\u003eMFRC522-python library\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWiring and Interface Notes\u003c\/h2\u003e\n\u003cp\u003eConnect the MFRC522 reader to your microcontroller using SPI: typically wire SS to pin 10, RST to 9, SCK to 13, MOSI to 11, and MISO to 12 on an Arduino Uno. The cards are passive, requiring no power—simply hold them near the reader to read or write data. For platforms like Raspberry Pi, enable SPI in settings and use the corresponding MFRC522 Python library.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"faq\"\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eHow do I write data to these MIFARE Classic cards?\u003c\/h3\u003e\n    \u003cp\u003eYou can write up to 1KB of data using the MFRC522 library’s write functions, but each sector must be authenticated with a key first. Default keys are often FFFFFFFFFFFF for unused cards.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eCan these cards be used for long-range identification?\u003c\/h3\u003e\n    \u003cp\u003eNo, the maximum read range is about 10 cm with the MFRC522 reader. For longer range, consider UHF RFID tags.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"Product\",\n      \"@id\": \"https:\/\/compoden.in\/products\/rfid-cards-1356mhz-mifare-classic-pack-of-5-for-mfrc522#product\",\n      \"name\": \"RFID Cards 13.56MHz MIFARE Classic – Pack of 5 for MFRC522\",\n      \"description\": \"5-pack 13.56MHz MIFARE Classic RFID cards for MFRC522 reader. Ideal for Arduino, ESP32, Raspberry Pi access control and attendance projects. Compoden India.\",\n      \"sku\": \"CDN-0974\",\n      \"mpn\": \"CDN-0974\",\n      \"brand\": {\"@type\": \"Brand\", \"name\": \"Compoden\"},\n      \"offers\": {\n        \"@type\": \"Offer\",\n        \"priceCurrency\": \"INR\",\n        \"price\": \"PRICE_PLACEHOLDER\",\n        \"availability\": \"https:\/\/schema.org\/InStock\",\n        \"seller\": {\"@type\": \"Organization\", \"name\": \"Compoden\", \"url\": \"https:\/\/compoden.in\"}\n      }\n    },\n    {\n      \"@type\": \"FAQPage\",\n      \"@id\": \"https:\/\/compoden.in\/products\/rfid-cards-1356mhz-mifare-classic-pack-of-5-for-mfrc522#faq\",\n      \"mainEntity\": [\n        {\"@type\": \"Question\", \"name\": \"How do I write data to these MIFARE Classic cards?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"You can write up to 1KB of data using the MFRC522 library’s write functions, but each sector must be authenticated with a key first. 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