The part number **B65819-P-R87** corresponds to a specific high-frequency ferrite core manufactured by **TDK Electronics (formerly EPCOS)**. Specifically, this belongs to the **PM 74/59** core series. --- ## 1. Technical Specifications The following table outlines the core electrical and physical parameters of the B65819-P-R87: | Parameter | Specification | | :--- | :--- | | **Core Shape** | PM (Pot Core Module) | | **Size** | 74 mm x 59 mm | | **Material Grade** | N87 | | **Initial Permeability ($\mu_i$)** | 2200 | | **Effective Volume ($V_e$)** | 78500 $mm^3$ | | **Effective Length ($l_e$)** | 128 mm | | **Effective Area ($A_e$)** | 615 $mm^2$ | | **$A_L$ Value** | 10000 nH (approx. +/- 25%) | --- ## 2. Key Component Details ### A. Core Shape: PM (Pot Module) The **PM core** is designed for high-power applications. It offers several advantages: * **Self-Shielding:** The shape minimizes electromagnetic interference (EMI). * **Large Cross-Section:** Allows for high power throughput with minimal losses. * **Ease of Assembly:** Designed to be used with specific bobbins and mounting clips for heavy-duty industrial use. ### B. Material Grade: N87 The **N87** material is a Power Ferrite optimized for low power loss in high-frequency switching applications. * **Frequency Range:** Typically used up to 500 kHz. * **Temperature Stability:** It reaches its minimum power loss at approximately 100°C, making it ideal for hot-running power supplies. * **Saturation Flux Density:** High ($B_s \approx 490$ mT at 25°C). --- ## 3. Applications Due to its large size and high power handling capabilities, this core is commonly found in: 1. **High Power SMPS:** Used as the main transformer in Switch Mode Power Supplies (kW range). 2. **Solar Inverters:** High-frequency DC-DC converters for renewable energy. 3. **Inductive Heating:** High-frequency power generators. 4. **Telecom Power:** Large scale power distribution units. --- ## 4. Part Number Breakdown The TDK/EPCOS numbering system for this part follows this logic: * **B65819:** The series code representing the PM 74/59 physical size. * **P:** Indicates the specific version/accessory compatibility. * **R87:** Indicates the **N87** material grade.