The part number **B65811-P-R87** corresponds to a specific type of ferrite core component, manufactured by TDK Electronics (formerly EPCOS). It belongs to the **PM (Pot Core Module)** series, specifically designed for power transformers and inductors. --- ### 1. Component Overview The B65811 series identifies the **PM 62/49** size. These cores are designed to handle high power levels while maintaining a compact footprint. | Feature | Specification | | :--- | :--- | | **Series** | PM (Pot Core) | | **Core Size** | 62/49 (Diameter/Height approx.) | | **Material Grade** | N87 | | **Function** | Power Conversion / Storage | | **Manufacturer** | TDK Electronics (EPCOS) | --- ### 2. Technical Breakdown of the Part Number * **B65811**: Indicates the core shape and size (PM 62/49). * **P**: Refers to the accessory or mounting style (often implies compatibility with specific bobbins). * **R87**: Denotes the **N87 material**, which is a power manganese-zinc (MnZn) ferrite. --- ### 3. Material Properties (N87 Ferrite) The **N87** material is the most critical technical aspect of this part. It is optimized for low power loss in high-frequency applications. | Property | Value/Characteristic | | :--- | :--- | | **Initial Permeability ($\mu_i$)** | ~2200 | | **Frequency Range** | Up to 500 kHz | | **Saturation Flux Density** | ~490 mT (at 25°C) | | **Curie Temperature** | > 210 °C | | **Best Performance** | Optimized for operation at 100°C | --- ### 4. Typical Applications Because of its size and material composition, the B65811-P-R87 is used in high-performance power electronics: * **Switch-Mode Power Supplies (SMPS):** Large-scale industrial power converters. * **Solar Inverters:** Handling high-frequency DC-AC conversion. * **EV Charging:** Used in the magnetic stages of onboard chargers. * **Telecom Power:** High-density power modules. --- ### 5. Mechanical Considerations This core is usually used in pairs. A complete assembly requires: 1. **Two Core Halves:** (Ordered as two units of B65811). 2. **Bobbin:** To hold the wire windings. 3. **Clamps/Yokes:** To hold the two halves together tightly to minimize the air gap.