The part number **2223-R** typically refers to a specific series of high-current, radial-leaded **Toroidal Inductors** (also known as chokes) manufactured by companies like **Bourns (JW Miller)**. These components are primarily used for power conversion and filtering. --- ### 1. Key Technical Specifications The "2223-R" series is defined by its vertical mounting style and high saturation current. | Parameter | Typical Value (Series Average) | | :--- | :--- | | **Inductance Range** | 1.2 µH to 1000 µH | | **Current Rating** | Up to 13.5 Amps DC | | **Mounting Type** | Through-Hole (Radial Leads) | | **Core Material** | Iron Powder (typically) | | **Operating Temp** | -55°C to +105°C | | **RoHS Status** | Compliant (indicated by the "-R" suffix) | --- ### 2. Physical Construction * **Toroidal Core:** The wire is wound around a doughnut-shaped core. This shape is highly efficient because it contains the magnetic flux within the core, reducing Electromagnetic Interference (EMI) with nearby components. * **Vertical Orientation:** Unlike horizontal toroids, the 2223-R stands upright to save "footprint" space on the Printed Circuit Board (PCB). * **Coating:** Usually coated with UL-recognized shrink tubing or epoxy to protect the windings and provide insulation. --- ### 3. Applications These parts are designed for heavy-duty power applications where filtering noise or storing energy is critical: 1. **Switching Power Supplies:** Used as output filters to smooth out ripple current. 2. **EMI/RFI Filtering:** Reduces high-frequency noise in power lines. 3. **DC/DC Converters:** Acts as an energy storage element. 4. **Signal Conditioning:** Used in industrial electronic equipment to stabilize voltage. --- ### 4. Part Number Breakdown (Bourns Example) If you are looking at a specific variant, the number usually follows this logic: | Segment | Meaning | | :--- | :--- | | **22** | Series designation (Physical size/frame) | | **23** | Specific inductance code or mounting style | | **-R** | **RoHS Compliant** (Lead-free) | --- ### 5. Selection Considerations When replacing or selecting a 2223-R inductor, consider these two critical factors: * **Saturation Current ($I_{sat}$):** The point where the inductance drops because the core cannot hold more magnetic flux. Ensure your circuit's peak current is below this. * **DC Resistance (DCR):** Lower DCR is better to prevent the inductor from overheating due to power loss ($P = I^2R$).