The part number **47LT-162B-R** refers to a high-frequency, surface-mount (SMT) common mode choke, typically manufactured by companies like **Coilcraft** or specialized magnetic component suppliers. These components are essential for EMI (Electromagnetic Interference) filtering in high-speed data lines. --- ### 1. Technical Specifications Below are the general technical parameters typical for this class of component: | Parameter | Specification (Typical) | | :--- | :--- | | **Component Type** | Common Mode Choke / Filter | | **Inductance** | ~1.6 mH (indicated by "162") | | **Current Rating** | 50mA to 500mA (application dependent) | | **Mounting Type** | Surface Mount (SMD/SMT) | | **Package/Case** | 47LT Series (Standardized footprint) | | **RoHS Status** | Compliant (indicated by "-R") | | **Operating Temp** | -40°C to +125°C | --- ### 2. Functional Breakdown The 47LT-162B-R serves specific roles within an electronic circuit: * **Noise Suppression:** It is designed to pass desired signals (differential mode) while blocking unwanted noise (common mode) that can interfere with sensitive electronics. * **Signal Integrity:** By filtering high-frequency noise without distorting the actual data waveform, it ensures stable communication in protocols like USB, CAN bus, or Ethernet. * **Isolation:** The "B" designation often refers to specific winding configurations or isolation ratings between the internal coils. --- ### 3. Part Number Decoding Manufacturers often use a specific logic for these codes: | Code Segment | Meaning | | :--- | :--- | | **47LT** | Series identifier (Physical size and core material) | | **162** | Inductance value: 16 followed by two zeros ($16 \times 10^2$ µH = 1.6 mH) | | **B** | Tolerance or specific winding style | | **R** | RoHS Compliant / Lead-free | --- ### 4. Common Applications * **Automotive Electronics:** Used in CAN-bus systems to prevent engine noise from affecting sensor data. * **Power Supplies:** Filtering input/output lines in DC-DC converters. * **Telecommunications:** Protecting data lines from RF interference.