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SIC618A Immobilizer Wedge Transponder for Vehicle Security

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In an era where vehicle security requires uncompromising technological resilience, Silicon Craft Technology proudly introduces the SIC618A, a direct, drop-in replacement for the ID8A transponder family. Specifically for demanding security environments, the SIC618A is a specialized, low-frequency, half-duplex (HDX) RFID tag. Engineered primarily for automotive immobilization, this advanced transponder operates at a 134.2 kHz field frequency and carries built-in AES 128-bit encryption based on the DAES crypto algorithm. Because it delivers top-tier cryptographic processing directly on the chip, the SIC618A ensures that vehicles and high-value assets remain strictly protected against modern theft techniques.

Fig. 1: A key fob in a vehicle ignition cylinder, where LF RFID technology enables secure transponder authentication as part of the vehicle immobilizer system


The Application: Seamless and Secure Vehicle Immobilization

At the core of modern vehicle anti-theft systems lies the immobilizer transponder. The transponder sits safely within a vehicle’s mechanical key bow or digital key fob. There, it engages in a rapid, highly secure mutual authentication process with the vehicle’s base station reader.

The SIC618A immobilizer wedge transponder excels in this application, since it independently processes the complex authentication operations required for automotive immobilizers. It harvests energy directly from the induced RF field provided by the reader. Then, it stores the energy in an external storage capacitor to power its internal circuits. This passive capability means that even if a driver’s remote key battery is completely depleted, the SIC618A will successfully authenticate. As a result, it allows the driver to start the engine reliably every single time. In addition, its robust security makes it equally suited for industrial access control and high-level security systems.

Key Features and Functional Excellence

The SIC618A immobilizer wedge transponder packs premium features tailored to meet the strict functional demands of automotive tier-1 suppliers and security engineers:

  • Advanced Cryptographic Engine:

    The transponder features authentication based on the DAES crypto algorithm using a 128-bit secret key.

  • Seamless Communication:

    The device utilizes ASK for downlink data transmission and FSK for the uplink at 134kHz/123kHz with an RF/16 data rate.

  • Total Protocol Compatibility:

    It is fully compatible with DAES command sets and protocols.

  • Extensive and Reliable Memory:

    The device includes a 1,920-bit user memory, a 128-bit secret key space, a 24-bit unique serial number, and an 8-bit manufacturer code.

  • Lifelong Data Security:

    The memory structure guarantees 100,000 erase/write cycles and an impressive 20 years of non-volatile data retention.

  • Automotive-Grade Durability:

    The SIC618A is officially qualified to AEC-Q100 Grade 3 standards, operating flawlessly in extreme temperatures ranging from -40°C to 85°C.

Fig. 2: Wedge-form-factor LF RFID transponder chips designed for embedding inside car key fobs as part of a vehicle immobilizer system.


The Advantages of the Wedge Form Factor

The physical design of a security transponder is crucial for seamless manufacturing and integration. The SIC618A immobilizer wedge transponder uses a highly durable, industry-standard wedge package. Because of this, the wedge shape fits snugly into the dedicated slots of traditional car keys. Likewise, it fits well into modern smart fobs. Its robust casing protects the sensitive silicon and antenna connections from physical shock, vibration, and environmental wear. Therefore, it guarantees years of uninterrupted performance.

Advantages for Target Users

For automotive engineers and security solution providers, the SIC618A immobilizer wedge transponder offers a seamless and powerful upgrade path to replace the ID8A transponder family.

Above all, one of its most significant advantages is its high degree of configuration flexibility. The device lets developers tailor it to specific security requirements by adjusting its authentication mode security level. Consequently, this outstanding adaptability makes the SIC618A immobilizer wedge transponder an exceptionally robust choice for securing valuable assets and strictly limiting access to authorized personnel or systems.

Learn more about our SIC618A ID8A Replacement at Silicon Craft Product: SIC618A ID8A Replacement