The part number **B65821C1008T001** refers to a high-quality ferrite core accessory, specifically a **Coil Former (Bobbin)**, manufactured by **TDK Electronics (formerly EPCOS)**. --- ### 1. General Specifications This component is designed to hold the copper wire windings that wrap around a ferrite core (typically an E-core or ETD-core). | Feature | Specification | | :--- | :--- | | **Manufacturer** | TDK Electronics (EPCOS) | | **Component Type** | Coil Former / Bobbin | | **Core Series** | E 25/13/7 | | **Material** | GFR Polyterephthalate (Thermoplastic) | | **Flammability Rating** | UL 94 V-0 | | **Number of Terminals** | 10 Pins | | **Mounting Type** | Through-Hole (THT) | --- ### 2. Technical Breakdown The part number follows the standard EPCOS/TDK coding system: * **B65821**: Identifies the specific series (E 25/13/7 core size). * **C**: Indicates the accessory type (Coil Former). * **1008**: Refers to the specific mechanical configuration (10 pins, version 08). * **T001**: Represents the material type and packaging standard. --- ### 3. Mechanical Properties This bobbin is designed for precision winding and high thermal stability. * **Pin Layout:** It features 10 solder pins (5 on each side) for secure PCB mounting. * **Solderability:** The pins are tinned for easy soldering according to IEC 60068-2-20 standards. * **Resistance to Soldering Heat:** Designed to withstand wave soldering temperatures (approx. 260°C for 10 seconds). --- ### 4. Applications The B65821C1008T001 is used in conjunction with E-shaped ferrite cores to create magnetic components such as: 1. **Switch Mode Power Supplies (SMPS):** Used in the main transformer. 2. **DC-DC Converters:** Providing galvanic isolation and voltage regulation. 3. **Inductors:** For filtering and energy storage in industrial electronics. 4. **Telecom Equipment:** High-frequency signal transformers. --- ### 5. Compatible Ferrite Cores To complete the assembly, this bobbin is usually paired with two E 25/13/7 ferrite halves (e.g., N87 or N27 material grades) and a stainless steel yoke/clip to hold the halves together.