The part number **47LAC-161R-R** typically refers to a specialized electronic component, specifically a **Surface Mount Device (SMD) Common Mode Choke** or a high-frequency inductor, often manufactured by companies like **ABC Taiwan** or similar magnetic component specialists. These parts are primarily used for EMI (Electromagnetic Interference) suppression in high-speed data lines. --- ### 1. Technical Specifications Based on the standard nomenclature for this series, here are the general technical characteristics: | Property | Typical Value | | :--- | :--- | | **Component Type** | Common Mode Choke / Filter | | **Impedance** | 160 $\Omega$ (indicated by "161") | | **Test Frequency** | 100 MHz | | **Rated Current** | 300mA - 500mA (standard for this size) | | **DC Resistance (DCR)** | < 0.40 $\Omega$ | | **Package Size** | 0805 or 1206 (Metric 2012 or 3216) | | **Termination** | RoHS Compliant (indicated by "-R") | --- ### 2. Part Number Breakdown The code can be deconstructed to understand the specific attributes: * **47LAC**: The series designation, representing a specific material composition (usually ferrite) and physical structure designed for low-profile applications. * **161**: The impedance value. The first two digits are significant figures, and the third is the multiplier. * $16 \times 10^1 = 160$ Ohms at 100MHz. * **R**: Tolerance or Characteristic code. * **-R**: Typically signifies **RoHS Compliance** and/or **Tape & Reel** packaging. --- ### 3. Key Applications This component is designed to filter out "noise" while allowing the desired signal to pass through. Common use cases include: 1. **USB 2.0/3.0 Lines**: To prevent radiation from high-speed data transmission. 2. **HDMI/DVI Interfaces**: Ensuring signal integrity in video outputs. 3. **CAN-Bus**: Used in automotive electronics to stabilize communication between modules. 4. **IEEE1394 (Firewire)**: High-speed differential signal filtering. --- ### 4. How it Works Common mode chokes like the **47LAC-161R-R** consist of two coils wound on a single core. * **Differential Mode:** When signals travel in opposite directions (useful data), the magnetic fields cancel out, allowing the signal to pass with minimal impedance. * **Common Mode:** When noise travels in the same direction on both lines, the magnetic fields add up, creating high impedance and effectively blocking the noise.