Keszoox
PCF7946AT SOP-14 Transponder RFID Security IC — PCF7946 Series
PCF7946AT SOP-14 Transponder RFID Security IC PCF7946 Series
Couldn't load pickup availability
PCF7946AT — SOP-14 Transponder RFID Security IC
The PCF7946AT is an NXP 125kHz RFID transponder IC in SOP-14 package, designed for automotive immobilizer systems, access control, and secure key fob applications. It features crypto-based mutual authentication and I²C interface, making it a key component in vehicle anti-theft systems and secure identification applications.
Key Specifications
| Parameter | Value |
|---|---|
| Part Number | PCF7946AT |
| Package | SOP-14 |
| Operating Frequency | 125kHz (LF RFID) |
| Interface | I²C (to host MCU) |
| Authentication | Crypto mutual authentication |
| Memory | EEPROM (configuration and key storage) |
| Supply Voltage | 2.5V – 5.5V |
| Operating Temperature | -40°C to +85°C |
Why Choose PCF7946AT?
- ✅ Automotive-grade — -40°C to +85°C, designed for vehicle immobilizer environments
- ✅ Crypto authentication — secure mutual authentication prevents cloning
- ✅ I²C interface — simple connection to host microcontroller
- ✅ 125kHz LF RFID — penetrates metal and works in harsh RF environments
- ✅ NXP quality — genuine parts for reliable immobilizer and access control repair
Compatible With / Works With
- Automotive immobilizer base stations (125kHz LF antenna coil)
- Vehicle key fob PCB repair (Renault, Peugeot, Citroën, Vauxhall)
- Access control reader modules (125kHz LF)
- Host MCUs via I²C: STM8, PIC, AVR, STM32
- PCF7941, PCF7942, PCF7943, PCF7944 (same family)
Typical Applications
- Automotive Immobilizer — transponder IC in vehicle key fob for engine immobilizer system
- Key Fob Repair — replace failed PCF7946 in Renault, Peugeot, or Vauxhall key fob PCB
- Access Control — 125kHz RFID transponder for door access card or fob
- Secure Identification — crypto-authenticated ID tag for asset tracking
FAQ
Q: Which vehicles use PCF7946AT?
A: PCF7946AT is commonly found in key fobs for Renault, Peugeot, Citroën, Vauxhall/Opel, and Nissan vehicles (2000s–2010s models). Always verify the exact IC marking on the original key fob PCB before ordering.
Q: Can PCF7946AT be programmed without special equipment?
A: 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.
Q: Is PCF7946AT the same as PCF7941/7942/7943?
A: 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.
Package Contents
- PCF7946AT SOP-14 Transponder RFID Security IC (quantity per variant selected)
