The **CDH53_13** typically refers to a specific series of **Power Inductors**, specifically SMD (Surface Mount Device) unshielded or semi-shielded power inductors used in various electronic power management circuits. Below is a breakdown of the electronic specifications and characteristics for this component class. --- ### 1. General Specifications The "CDH53" designation usually describes the physical dimensions and core type. | Parameter | Typical Value / Description | | :--- | :--- | | **Type** | SMD Power Inductor | | **Dimensions (LxWxH)** | Approx. 5.8mm x 5.2mm x 3.0mm | | **Inductance Range** | 1.0µH to 1000µH (standard range) | | **Tolerance** | ±10% (K) or ±20% (M) | | **Operating Temperature** | -40°C to +125°C (includes self-temperature rise) | --- ### 2. Physical Construction The CDH53_13 is built using a ferrite drum core and copper wire winding. * **Core Material:** Ferrite (Ni-Zn or Mn-Zn) for high-frequency performance and low losses. * **Winding:** Enameled copper wire. * **Terminals:** Solder-plated (typically Sn/Ag/Cu) for surface mounting on PCBs. * **Shielding:** Usually **Unshielded**. This means the magnetic field is not contained, which allows for higher saturation currents in a small package but may cause EMI (Electromagnetic Interference) issues if placed too close to sensitive components. --- ### 3. Electrical Performance Characteristics When selecting a CDH53_13 part, the following three values are critical: 1. **DCR (DC Resistance):** The resistance of the copper wire. Lower DCR is preferred to minimize heat loss and maximize efficiency. 2. **Isat (Saturation Current):** The DC current at which the inductance drops by a specific percentage (usually 10% or 30%). 3. **Irms (Rise Current):** The DC current that causes the temperature of the inductor to rise by a specific amount (usually 40°C) above ambient. --- ### 4. Common Applications These inductors are designed for high-density mounting and are found in: * **DC-DC Converters:** Buck, Boost, and Buck-Boost regulators. * **Consumer Electronics:** Laptops, tablets, and LED TV backlighting. * **Communication Equipment:** Base stations and routers. * **Power Supplies:** Small-scale switching mode power supplies (SMPS). --- ### 5. Example Part Marking Code If you see a part labeled `220`, it follows the standard numerical code: ```text 22 (Significant Digits) + 0 (Multiplier) = 22 x 10^0 = 22µH ```