{"product_id":"pcf7946at-sop14-transponder-rfid-security-ic-pcf7946","title":"PCF7946AT SOP-14 Transponder RFID Security IC — PCF7946 Series","description":"\u003ch2\u003ePCF7946AT — SOP-14 Transponder RFID Security IC\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003ePCF7946AT\u003c\/strong\u003e is an NXP \u003cstrong\u003e125kHz RFID transponder IC\u003c\/strong\u003e in SOP-14 package, designed for \u003cstrong\u003eautomotive immobilizer systems, access control, and secure key fob applications\u003c\/strong\u003e. It features crypto-based mutual authentication and I²C interface, making it a key component in vehicle anti-theft systems and secure identification applications.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eKey Specifications\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003ePCF7946AT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage\u003c\/td\u003e\n\u003ctd\u003eSOP-14\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Frequency\u003c\/td\u003e\n\u003ctd\u003e125kHz (LF RFID)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterface\u003c\/td\u003e\n\u003ctd\u003eI²C (to host MCU)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAuthentication\u003c\/td\u003e\n\u003ctd\u003eCrypto mutual authentication\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMemory\u003c\/td\u003e\n\u003ctd\u003eEEPROM (configuration and key storage)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd\u003e2.5V – 5.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-40°C to +85°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003chr\u003e\u003ch3\u003eWhy Choose PCF7946AT?\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e✅ \u003cstrong\u003eAutomotive-grade\u003c\/strong\u003e — -40°C to +85°C, designed for vehicle immobilizer environments\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eCrypto authentication\u003c\/strong\u003e — secure mutual authentication prevents cloning\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eI²C interface\u003c\/strong\u003e — simple connection to host microcontroller\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003e125kHz LF RFID\u003c\/strong\u003e — penetrates metal and works in harsh RF environments\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eNXP quality\u003c\/strong\u003e — genuine parts for reliable immobilizer and access control repair\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eCompatible With \/ Works With\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eAutomotive immobilizer base stations (125kHz LF antenna coil)\u003c\/li\u003e\n\u003cli\u003eVehicle key fob PCB repair (Renault, Peugeot, Citroën, Vauxhall)\u003c\/li\u003e\n\u003cli\u003eAccess control reader modules (125kHz LF)\u003c\/li\u003e\n\u003cli\u003eHost MCUs via I²C: STM8, PIC, AVR, STM32\u003c\/li\u003e\n\u003cli\u003ePCF7941, PCF7942, PCF7943, PCF7944 (same family)\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eTypical Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomotive Immobilizer\u003c\/strong\u003e — transponder IC in vehicle key fob for engine immobilizer system\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKey Fob Repair\u003c\/strong\u003e — replace failed PCF7946 in Renault, Peugeot, or Vauxhall key fob PCB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess Control\u003c\/strong\u003e — 125kHz RFID transponder for door access card or fob\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecure Identification\u003c\/strong\u003e — crypto-authenticated ID tag for asset tracking\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ: Which vehicles use PCF7946AT?\u003c\/strong\u003e\u003cbr\u003eA: PCF7946AT is commonly found in key fobs for \u003cstrong\u003eRenault, Peugeot, Citroën, Vauxhall\/Opel, and Nissan\u003c\/strong\u003e vehicles (2000s–2010s models). Always verify the exact IC marking on the original key fob PCB before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Can PCF7946AT be programmed without special equipment?\u003c\/strong\u003e\u003cbr\u003eA: Programming requires a compatible automotive key programmer or immobilizer tool that supports PCF7946 protocol. Standard RFID readers cannot program this IC due to its crypto authentication layer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Is PCF7946AT the same as PCF7941\/7942\/7943?\u003c\/strong\u003e\u003cbr\u003eA: These are members of the same NXP transponder family with different feature sets and crypto implementations. They are not directly interchangeable — verify the exact part number from the original PCB before substituting.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003ePackage Contents\u003c\/h3\u003e\u003cul\u003e\u003cli\u003ePCF7946AT SOP-14 Transponder RFID Security IC (quantity per variant selected)\u003c\/li\u003e\u003c\/ul\u003e","brand":"Keszoox","offers":[{"title":"Default Title","offer_id":46991483109611,"sku":"\u003cnone\u003e","price":8.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/pcf7946at-sop14-rfid-ic.webp?v=1761544760","url":"https:\/\/keszoox.com\/products\/pcf7946at-sop14-transponder-rfid-security-ic-pcf7946","provider":"Keszoox","version":"1.0","type":"link"}