The part number **B65541-W-R87** refers to a high-quality ferrite core manufactured by **TDK Electronics (formerly EPCOS)**. Specifically, this part is a **PM Core (Pot Core Module)** designed for power applications. --- ### 1. Technical Specifications The part number can be broken down into specific design characteristics: | Feature | Specification | | :--- | :--- | | **Core Shape** | PM 50/39 (Pot Core Module) | | **Material Grade** | N87 (Power Ferrite Material) | | **Magnetic Path Length ($l_e$)** | 84.0 mm | | **Effective Area ($A_e$)** | 370.0 mm² | | **Effective Volume ($V_e$)** | 31000 mm³ | | **AL Value** | 8400 nH (+30%/-20%) | | **Air Gap** | None (Ungapped) | --- ### 2. Material Properties: N87 Ferrite The **N87** designation is critical as it defines the electrical behavior of the core: * **Type:** Power Manganese-Zinc (MnZn) ferrite. * **Frequency Range:** Optimized for frequencies up to approximately **500 kHz**. * **Saturation Flux Density:** High (~490 mT at 25°C). * **Core Loss:** Low power loss specifically optimized for temperatures around **100°C**, making it ideal for power supplies. --- ### 3. Physical Construction The PM (Pot Module) shape is preferred over standard E-cores or Toroids in specific high-power scenarios because: * **Self-Shielding:** The shape partially encloses the winding, reducing Electromagnetic Interference (EMI). * **Heat Dissipation:** Large surface area and specialized mounting hardware (clips/studs) allow for efficient cooling. * **Winding Ease:** Uses a cylindrical bobbin which simplifies the winding process and allows for thick wire or copper foil. --- ### 4. Common Applications Due to its size (PM 50/39) and the N87 material, this part is typically found in: 1. **Switch-Mode Power Supplies (SMPS):** Main transformers for high-wattage converters. 2. **DC-DC Converters:** High-efficiency power conversion in industrial electronics. 3. **Inductors:** High-current storage chokes or filter inductors. 4. **Telecommunications:** Power feed transformers. --- ### 5. Associated Accessories To use the **B65541-W-R87** in a design, you typically require the following complementary parts: * **Bobbin:** B65542 (The plastic coil former). * **Mounting Assembly:** B65545 (Clips and bolts to hold the two core halves together).