The **WI322522-R18JF** is a surface-mount (SMD) wire-wound chip inductor. It is designed for high-frequency applications where stability and precision are required in a small footprint. Below is a detailed breakdown of its electronic specifications and characteristics. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify the physical and electrical properties: | Segment | Meaning | Description | | :--- | :--- | :--- | | **WI** | Series | Wire-wound Inductor | | **322522** | Size Code | Dimensions: 3.2mm x 2.5mm x 2.2mm (EIA 1210) | | **R18** | Inductance | **0.18 µH** (R denotes decimal point) | | **J** | Tolerance | **±5%** | | **F** | Compliance | RoHS Compliant / Lead-Free | --- ### 2. Technical Specifications These values are typical for standard versions of this component (e.g., from manufacturers like Bourns or Fastron): | Parameter | Value | | :--- | :--- | | **Inductance** | 0.18 µH | | **Tolerance** | ±5% | | **Q-Factor (Min)** | 28 - 30 (at test frequency) | | **Self-Resonant Frequency (SRF)** | ~400 MHz to 500 MHz | | **DC Resistance (DCR Max)** | ~0.25 Ω to 0.40 Ω | | **Rated Current (I-dc)** | ~450 mA | | **Operating Temperature** | -40°C to +125°C | --- ### 3. Key Features * **Wire-Wound Construction:** Unlike multilayer inductors, wire-wound types offer significantly higher Q-factors and lower DC resistance, making them more efficient for RF signals. * **1210 Form Factor:** The "3225" metric size (3.2 x 2.5mm) is standard for industrial and consumer electronics, providing a balance between power handling and space-saving. * **High Stability:** The ceramic or ferrite core construction ensures stable inductance across a wide temperature range. --- ### 4. Common Applications Due to its 0.18 µH value and high-frequency characteristics, it is commonly found in: 1. **RF Circuits:** Matching networks and filters for wireless communication. 2. **Signal Conditioning:** Decoupling and noise suppression in high-speed data lines. 3. **Consumer Electronics:** Mobile phones, GPS modules, and Bluetooth devices. 4. **Power Management:** Small DC-DC converters where low-profile high-Q inductors are needed. ---