The **MH42TAG-R** is a specific RFID (Radio Frequency Identification) transponder, commonly known as a "Handy" tag or "Brick" tag, widely used in industrial automation, tool management, and logistics systems (often associated with brands like Turck or Balluff). Below is the breakdown of its electronic components and specifications. --- ## 1. Technical Overview The MH42TAG-R is a passive electronic component, meaning it does not contain a battery. It derives its power from the electromagnetic field generated by an RFID reader. ### Key Specifications | Feature | Specification | | :--- | :--- | | **Frequency** | 13.56 MHz (High Frequency - HF) | | **Protocol** | ISO 15693 | | **Memory Capacity** | Typically 1024 Bits (128 Bytes) EEPROM | | **Chip Type** | NXP I-Code SLI or equivalent | | **Data Retention** | > 10 Years | | **Read/Write Cycles** | 100,000 cycles | --- ## 2. Internal Electronic Parts The tag consists of three primary electronic sub-components encapsulated in a rugged housing. ### A. Integrated Circuit (IC) The "brain" of the tag. It manages: * **Modulation/Demodulation:** Converting radio waves into digital data. * **Rectifier:** Converting the RF field into DC voltage to power the chip. * **Memory Management:** Handling the read/write access to the internal EEPROM. * **Anti-collision Logic:** Allowing multiple tags to be read in the same field. ### B. Antenna Coil A micro-coil made of wound copper wire. * **Function:** It acts as an inductor. When placed in a 13.56 MHz magnetic field, it creates an inductive coupling (transformer principle) to transfer energy and data. * **Form Factor:** Compactly wound to fit the small rectangular or cylindrical "brick" shape. ### C. Capacitor Often integrated directly onto the silicon chip or as a discrete SMD component. * **Function:** It works with the antenna coil to form a **resonant LC circuit**. This circuit must be tuned specifically to 13.56 MHz to ensure maximum energy transfer efficiency. --- ## 3. Physical Construction & Durability Because these are used in harsh industrial environments (CNC machines, assembly lines), the electronic parts are protected by: * **Housing:** Usually Polyamide (PA6) or similar high-grade plastic. * **Potting:** The internal electronics are often encased in epoxy resin to prevent damage from vibration, shock, or coolant/oil ingress. * **Mounting:** Often designed to be flush-mounted in metal, though this usually requires a "spacer" or specific design to prevent the metal from detuning the antenna. --- ## 4. Communication Logic The device follows the **ISO 15693** standard, which dictates: 1. **Downlink (Reader to Tag):** Pulse Position Modulation (PPM). 2. **Uplink (Tag to Reader):** Load modulation using a subcarrier. ---