The **CW2012A-R11J** (often abbreviated as CW2012A-R11) is a surface-mount, wire-wound chip inductor designed for high-frequency RF applications. Below is a detailed breakdown of its electronic specifications and characteristics. --- ### 1. Part Number Breakdown The part number typically follows a standard convention used by manufacturers like **Bourns** or **Coilmaster**: | Component Segment | Description | | :--- | :--- | | **CW** | Product Series (Ceramic Core Wire-wound Inductor) | | **2012** | Package Size (0805 in imperial units) | | **A** | Material/Designator (often refers to specific tolerance or height) | | **R11** | Inductance Value: **0.11 µH (110 nH)** | | **J** | Tolerance Code (typically **±5%**) | --- ### 2. Technical Specifications These inductors are characterized by high "Q" factors and stable performance at high frequencies. | Parameter | Value / Range | | :--- | :--- | | **Inductance** | 110 nH (0.11 µH) | | **Inductance Tolerance** | ±5% (Standard) | | **Self-Resonant Frequency (SRF)** | > 1200 MHz (Minimum) | | **DC Resistance (DCR)** | ~0.60 to 0.70 Ω (Maximum) | | **Rated Current** | ~300 mA to 400 mA | | **Core Material** | Ceramic (High Stability) | | **Operating Temperature** | -40°C to +125°C | --- ### 3. Key Features * **High Q Factor:** The wire-wound construction provides significantly lower DC resistance and higher Q values than multilayer inductors, making them ideal for signal integrity. * **Ceramic Core:** Provides excellent thermal stability and a high self-resonant frequency. * **0805 Footprint:** Small surface-mount design suitable for compact PCB layouts. * **Precise Inductance:** The "R11" value is highly specific for tuning circuits. --- ### 4. Common Applications * **RF Communications:** Used in Bluetooth, Wi-Fi, and cellular modules for impedance matching. * **Filtering:** Low-pass, high-pass, and band-pass filters in RF front-ends. * **Tuning:** Resonant circuits where a stable inductance is required across varying temperatures. * **Oscillators:** Serving as a frequency-determining component in VCOs (Voltage Controlled Oscillators). --- ### 5. Land Pattern (0805 Imperial) If you are designing a PCB, the standard 0805 (2012 metric) dimensions are: ```markdown - Length: 2.0 mm - Width: 1.25 mm - Height: 1.2 mm (approx) ```