The **47LAC-201R-R** is a specific surface-mount (SMT) common mode choke, typically manufactured by companies like **Sumida**. It is designed for noise suppression in DC power lines and signal lines. --- ### 1. Key Technical Specifications Below are the general technical parameters associated with this component series: | Parameter | Specification (Typical) | | :--- | :--- | | **Component Type** | Common Mode Choke / Filter | | **Inductance** | 200 $\mu$H (nominal) | | **Tolerance** | ±30% or ±50% (depending on specific binning) | | **Rated Current** | ~0.9A to 1.2A (Model specific) | | **DC Resistance (DCR)** | Max 0.25 $\Omega$ | | **Insulation Resistance** | 10M $\Omega$ Min. | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Physical Characteristics * **Mounting Type:** Surface Mount Device (SMD). * **Core Material:** Ferrite. * **Configuration:** It consists of two windings around a single core. This allows the component to pass desired currents (Differential Mode) while blocking unwanted noise (Common Mode). * **Case Size:** Usually part of a compact 4.7mm x 4.5mm (approx.) footprint, designed for high-density PCB layouts. --- ### 3. Functional Purpose The primary role of the 47LAC-201R-R is **Electromagnetic Interference (EMI) Filtering**. * **Common Mode Suppression:** It targets noise that flows in the same direction on both lines (e.g., power and ground). * **Signal Integrity:** By filtering out high-frequency noise, it prevents interference with sensitive digital signals or wireless communication modules. * **Applications:** * USB and IEEE1394 lines. * AC Adapters and DC-DC converters. * CAN-bus systems in automotive or industrial settings. --- ### 4. Part Number Breakdown (Generalized) While manufacturers have unique codes, the suffixing usually indicates: * **47LAC:** The series name/physical size. * **201:** The inductance code (20 followed by 1 zero = 200 $\mu$H). * **R:** Tolerance or specific winding style. * **-R:** Generally indicates compliance with **RoHS** (Lead-free) or Tape & Reel packaging.