The **CF252018-R33** is a surface-mount (SMD) wire-wound chip inductor. This component is commonly used in high-frequency circuits for signal filtering and impedance matching. Below is a detailed breakdown of its specifications and characteristics. --- ### 1. Part Number Breakdown The part number follows a standard naming convention for passive components: | Component Code | Dimensions (Metric/Imperial) | Inductance Value | Tolerance | | :--- | :--- | :--- | :--- | | **CF** | Manufacturer Series (Chip Fixed) | **252018** (2.5 x 2.0 x 1.8 mm) | **R33** (0.33 microhenries) | J (±5%) or K (±10%) | ### 2. Technical Specifications The "R33" indicates an inductance of **0.33 µH**. Typical electrical characteristics for this specific part include: | Parameter | Value (Typical) | | :--- | :--- | | **Inductance** | 0.33 µH (330 nH) | | **Case Size** | 1008 (Imperial) / 2520 (Metric) | | **DC Resistance (DCR)** | ~0.45 Ω to 0.80 Ω (Depends on brand) | | **Rated Current (Idc)** | ~400 mA to 600 mA | | **Self-Resonant Frequency (SRF)** | > 350 MHz | | **Quality Factor (Q)** | 25 - 30 (measured at ~25 MHz) | ### 3. Key Features * **Wire-wound Construction:** Unlike multilayer inductors, the wire-wound design offers significantly lower DC resistance and a higher Quality (Q) factor, making it more efficient for RF applications. * **Physical Size:** The 252018 dimensions (2.5mm length, 2.0mm width, 1.8mm height) make it suitable for compact PCB designs. * **High Reliability:** Usually encapsulated in ceramic or heat-resistant resin to withstand reflow soldering temperatures. ### 4. Common Applications 1. **RF Circuits:** Used in oscillators and high-frequency communication equipment. 2. **Filtering:** Effective at blocking high-frequency noise in power lines or signal paths. 3. **Mobile Electronics:** Found in GPS modules, Bluetooth devices, and Wi-Fi routers. 4. **Impedance Matching:** Ensuring maximum power transfer between different stages of a circuit. --- ### Equivalent Cross-Reference Example If you are looking for replacements from other manufacturers, search for: * **TDK:** NLV25T-R33J-PF * **Murata:** LQW2UASR33 * **Bourns:** CM252016-R33KL