The part number **B65805-P-R87** refers to a high-quality **RM6 ferrite core** manufactured by **TDK Electronics (formerly EPCOS)**. These components are essential in the design of compact transformers and inductors for power electronics. --- ## 1. Technical Specifications The part number follows a specific nomenclature used by TDK/EPCOS to define the shape, size, and material properties. | Parameter | Specification | Details | | :--- | :--- | :--- | | **Core Shape** | RM6 (Rectangular Modulus) | Optimized for high packing density on PCBs. | | **Material Grade** | N87 | A power material designed for frequencies up to 500 kHz. | | **AL Value** | 2000 nH (approx.) | Inductance factor (varies by air gap; 'P' indicates ungapped). | | **Core Set** | 2 halves | Sold as individual pieces (two required for a set). | | **Effective Volume** | 840 $mm^3$ | Space available for magnetic flux. | --- ## 2. Material Properties (N87 Grade) The **N87** material is a Manganese-Zinc (MnZn) ferrite specifically engineered for low power loss in switch-mode power supplies. * **Saturation Flux Density:** High ($B_s \approx 490$ mT at 25°C). * **Curie Temperature:** $> 210$ °C (ensures stability at high temperatures). * **Optimal Frequency Range:** 25 kHz to 500 kHz. * **Typical Use:** Power transformers, storage chokes, and DC/DC converters. --- ## 3. Physical Attributes ### Design Benefits * **RM Design:** The "Rectangular Modulus" shape allows for integrated pins in the bobbin, making it ideal for automated surface mount (SMD) or through-hole (THT) assembly. * **Center Hole:** Features a center hole that can accommodate a threaded core (slug) for fine-tuning inductance if necessary. ### Complementary Accessories To create a complete functional component, the B65805-P-R87 usually requires: 1. **Coil Former (Bobbin):** Holds the wire windings (e.g., B65806 series). 2. **Clamps/Clips:** To hold the two core halves together securely. --- ## 4. Common Applications Due to its N87 power material, this core is predominantly found in: * **Switched-Mode Power Supplies (SMPS):** Small AC/DC adapters. * **Telecommunications:** Signal transformers and broadband transformers. * **Industrial Electronics:** DC/DC converters for sensors and controllers.