The **CT05-R33K-RC** is a surface-mount power inductor manufactured by Central Technologies. It is part of the CT05 series, which is designed for high-frequency applications and power management in compact electronic devices. --- ### 1. Key Technical Specifications The part number provides specific data regarding its electrical characteristics: | Parameter | Value | Details | | :--- | :--- | :--- | | **Inductance** | 0.33 µH | Measured at 1.0 MHz | | **Tolerance** | ±10% | Indicated by the "K" in the part number | | **Current Rating (Idc)** | ~450 mA | The maximum DC current it can handle | | **DC Resistance (DCR)** | 0.45 Ω (Max) | Resistance of the internal wire/coil | | **SRF (Self-Resonant Freq)** | 450 MHz | The frequency at which it ceases to be inductive | | **Case Size** | 0805 (EIA) | Metric 2012 (2.0mm x 1.25mm) | --- ### 2. Part Number Breakdown Understanding the nomenclature helps in identifying equivalent components: * **CT05**: The series designation (Wire-wound Chip Inductor). * **R33**: The inductance value. "R" acts as the decimal point (0.33). * **K**: The tolerance code (K = ±10%). * **RC**: Denotes **RoHS Compliant**, meaning it is free from hazardous substances like lead. --- ### 3. Construction and Materials The CT05-R33K-RC is a **Wire-wound Chip Inductor**. Unlike multilayer inductors, wire-wound versions offer: * **Higher Q Factors:** Better efficiency in RF circuits. * **Lower DCR:** Reduced power loss and heat generation. * **Higher Current Capacity:** Can handle more power relative to its small physical size. --- ### 4. Typical Applications Because of its high self-resonant frequency and small 0805 footprint, this part is commonly found in: 1. **Mobile Communications:** Smartphones and tablets. 2. **Filtering:** Used in LC filters to block high-frequency noise. 3. **DC-DC Converters:** Small power supply modules for portable electronics. 4. **WLAN/Bluetooth:** RF matching circuits. ---