ISO/IEC 7816

ISO/IEC 7816 is the international standard that defines integrated circuit cards with contacts, commonly known as contact smart cards. Unlike RFID or NFC systems that operate wirelessly, ISO/IEC 7816 cards require physical insertion into a card reader that makes direct electrical contact through gold-plated pads visible on the card surface. The standard does not use radio frequency bands since communication occurs through galvanic contacts rather than electromagnetic coupling. The card contains eight contact points, though not all are used in every implementation, with power, ground, clock, reset, and data transmission being the primary connections. The physical layer specifications cover the card dimensions (85.6 by 53.98 millimeters, the familiar credit card size), location and assignment of contacts, and electrical characteristics including voltage levels and current requirements. Communication typically occurs at speeds ranging from 9600 baud up to several megabits per second depending on the protocol version and card capabilities. Since this is a contact-based system, there is no read range in the traditional RFID sense—the card must be physically inserted into a reader with metal contacts pressed against the card's contact pads. Anticollision protocols are unnecessary because the physical nature of insertion means only one card can communicate with a reader at a time. The ISO/IEC 7816 standard comprises multiple parts covering different aspects: Part 1 and 2 define physical characteristics, Part 3 specifies electrical interface and transmission protocols, Part 4 covers organization and security features for interindustry commands, and subsequent parts address various application protocols and security mechanisms. Communication follows asynchronous half-duplex protocols with the card acting as a slave device responding to commands from the reader. Typical applications include SIM cards in mobile phones, banking cards with EMV chip technology, government identification cards, healthcare cards, and secure access control systems where high security is paramount. The technology excels in applications requiring strong cryptographic operations, secure key storage, and protection against tampering. The International Organization for Standardization and International Electrotechnical Commission jointly ratify and maintain this standard, with contributions from financial institutions, telecommunications companies, and government agencies worldwide ensuring its relevance across multiple industries.