The term **CD3C** typically refers to a specific series of **Surface Mount Device (SMD) Power Inductors**. These are critical passive components used in power management circuits to store energy in a magnetic field. --- ### 1. Technical Specifications Inductors in the CD3C series are characterized by their compact size and high-reliability performance. Below are the general technical parameters: | Feature | Description | | :--- | :--- | | **Component Type** | Unshielded SMD Power Inductor | | **Size/Dimensions** | Approximately 3.5mm x 3.0mm x 1.6mm | | **Inductance Range** | Typically 1.0µH to 100µH | | **Tolerance** | Usually ±20% (M) | | **Operating Temp** | -40°C to +125°C | | **Material** | Ferrite core with enameled copper wire | --- ### 2. Key Internal Parts The construction of a CD3C inductor involves three primary electronic elements: 1. **Ferrite Core:** The "drum" or "I-beam" core made of Manganese-Zinc (MnZn) or Nickel-Zinc (NiZn). It concentrates the magnetic flux to provide high inductance in a small volume. 2. **Winding:** Fine copper wire wrapped around the core. The number of turns determines the inductance value ($L$). 3. **Terminations:** Solderable metallic pads (usually Tin/Lead or Lead-free Gold/Silver) located at the bottom for surface mounting on a PCB. --- ### 3. Common Applications Due to their small footprint, these parts are found in modern portable electronics: * **DC-DC Converters:** Used in "Buck" (Step-down) or "Boost" (Step-up) circuits to regulate voltage. * **LED Drivers:** Providing constant current for backlighting in mobile devices. * **Filtering:** Acting as a low-pass filter to remove high-frequency noise from power lines. * **Battery Management:** Found in smartphones and tablets to manage charging cycles efficiently. --- ### 4. Part Numbering Example If you see a part labeled **CD3C16-100M**, it is decoded as follows: * **CD:** Type (Unshielded Inductor) * **3C:** Size code (3.5mm x 3.0mm) * **16:** Height code (approx. 1.6mm) * **100:** Inductance value ($10 \times 10^0 = 10 \mu H$) * **M:** Tolerance ($\pm 20\%$)