The **CF322513-R18K** is a surface-mount (SMD) wire-wound chip inductor. It is commonly used in high-frequency circuits for filtering, decoupling, and impedance matching. Below is a detailed breakdown of its specifications and characteristics. ### 1. Part Number Breakdown The alphanumeric code follows a standard naming convention for electronic components: | Segment | Meaning | Details | | :--- | :--- | :--- | | **CF** | Series Type | Chip Ferrite Inductor (Wire-wound) | | **322513** | Case Size | 3.2mm x 2.5mm x 1.3mm (EIA 1210) | | **R18** | Inductance Value | **0.18 µH** (R denotes decimal point) | | **K** | Tolerance | **±10%** | --- ### 2. Technical Specifications These components are designed for stability and high performance in RF and power applications. | Parameter | Value (Typical) | | :--- | :--- | | **Inductance** | 0.18 µH | | **Tolerance** | ±10% | | **DC Resistance (DCR)** | ~0.15 - 0.40 Ω (Max) | | **Rated Current** | ~450 mA - 600 mA | | **Self-Resonant Frequency (SRF)** | >400 MHz | | **Operating Temperature** | -40°C to +125°C | --- ### 3. Key Physical Features * **Construction:** Wire-wound core. Unlike multilayer inductors, wire-wound types offer higher Q-factors (quality factor) and higher current carrying capacity. * **Encapsulation:** Often coated with epoxy resin for protection against environmental factors and mechanical stress. * **Footprint:** 1210 Imperial (3225 Metric), making it easy to handle in automated pick-and-place assembly. --- ### 4. Common Applications Due to its 0.18 µH value and high frequency response, it is typically found in: 1. **RF Circuits:** Impedance matching for wireless communication modules. 2. **Power Supplies:** DC-DC converter output filtering to reduce ripple. 3. **Signal Lines:** High-speed data line filtering to eliminate EMI/RFI noise. 4. **Telecommunications:** Base stations and portable radio equipment. --- ### 5. Equivalent Substitutes If the specific "CF" brand is unavailable, engineers often look for the following equivalents based on the **1210 / 0.18µH / 10%** criteria: * **TDK:** NLV32 series * **Murata:** LQH32 series * **Bourns:** CM322522 series