The part number **B66358** refers to a specific series of **E-type Ferrite Cores** manufactured by TDK Electronics (formerly EPCOS). These cores are fundamental components used to build inductors and transformers. --- ## 1. Core Specifications and Identification The B66358 series typically corresponds to the **E 20/10/6** core size. The dimensions and magnetic properties are standardized to allow for high-efficiency power conversion. ### Technical Dimensions | Parameter | Value (approx.) | | :--- | :--- | | **Core Shape** | E-Core | | **Length (A)** | 20.0 mm | | **Height (B)** | 10.0 mm | | **Width (C)** | 6.0 mm | | **Magnetic Path Length ($l_e$)** | 46.3 mm | | **Effective Cross Section ($A_e$)** | 32.1 $mm^2$ | --- ## 2. Common Materials and $A_L$ Values The performance of the B66358 core depends heavily on the ferrite material used. These materials are optimized for different frequency ranges and power levels. | Material | Typical Application | $A_L$ Value (nH) | | :--- | :--- | :--- | | **N27** | Power transformers (up to 100 kHz) | 1300 ±25% | | **N87** | High-frequency power (up to 500 kHz) | 1470 ±25% | | **N97** | Low power loss at high temperatures | 1550 ±25% | --- ## 3. Applications These ferrite cores are widely used in power electronics due to their ability to handle high magnetic flux with low energy loss. * **Switch Mode Power Supplies (SMPS):** Used as the main transformer core for AC-DC or DC-DC converters. * **Inductors:** Used in EMI filters and storage chokes. * **Inverters:** Common in solar power and automotive electronic control units. * **Chargers:** Small form-factor adapters for consumer electronics. --- ## 4. Associated Accessories A complete inductive component requires more than just the core. The B66358 series is usually paired with: 1. **Coil Formers (Bobbins):** Plastic frames (often part number B66359) that hold the wire windings. 2. **Yokes (Clips):** Stainless steel clips used to hold two E-core halves together tightly to minimize the air gap. --- ### Implementation Example (Naming Convention) A full part number might look like: `B66358G0000X187` * **B66358:** Core size (E 20/10/6). * **G:** Designates the gap (or "0" for ungapped). * **X187:** Refers to the material (e.g., N87).