The part number **4243-R** typically refers to a specific series of **Fixed Inductors/Chokes** manufactured by companies like **Bourns** (formerly J.W. Miller). These components are designed for high-current applications and are known for their durability and reliability in power management circuits. --- ### 1. Key Technical Specifications While specific values (like Inductance) depend on the suffix following "4243-R", the general characteristics of this series include: | Feature | Typical Specification | | :--- | :--- | | **Component Type** | High-current Hash Choke | | **Inductance Range** | 1.25 µH to 1000 µH (Series dependent) | | **Current Rating** | Up to 15-20 Amps (Depending on the model) | | **Mounting Type** | Through-Hole (Leaded) | | **Core Material** | Powdered Iron or Ferrite | | **Operating Temp** | -55°C to +105°C | --- ### 2. Physical Construction * **Winding:** Usually consists of heavy-duty copper wire wound around a core to minimize DC Resistance (DCR). * **Coating:** Often dipped in a protective varnish or epoxy to provide environmental protection and reduce mechanical vibration (noise). * **Leads:** Pre-tinned copper leads for easy soldering into PCBs. --- ### 3. Common Applications The 4243-R series is primarily used for **filtering** and **energy storage**. 1. **EMI/RFI Filtering:** Suppressing "hash" or high-frequency noise generated by motors, switching power supplies, or brushes. 2. **DC/DC Converters:** Acting as an energy storage element in buck or boost regulators. 3. **Power Supplies:** Smoothing out ripples in the output voltage of linear or switching power units. 4. **Automotive Electronics:** Used in systems requiring high current handling and ruggedness. --- ### 4. Part Number Breakdown (Example) The "-R" in the part number often signifies **RoHS Compliance**, meaning the part is manufactured without restricted hazardous substances like lead. ```text 4243 - 102 - R | | | Series | RoHS Compliant Value (e.g., 1000uH) ``` ---