The **CS321613-R12K** is a surface-mount (SMD) multilayer chip inductor. It is commonly used in high-frequency circuits for filtering, decoupling, and impedance matching. Below is a detailed breakdown of its electronic specifications and characteristics. --- ### 1. Part Number Breakdown Understanding the alphanumeric code helps identify the physical and electrical properties: | Component | Code | Meaning | | :--- | :--- | :--- | | **Series** | CS | Chip Inductor (Multilayer) | | **Size (Metric)** | 3216 | 3.2mm x 1.6mm (Equivalent to **1206** Imperial) | | **Thickness** | 13 | 1.3mm thickness | | **Inductance** | R12 | 0.12 microhenries (µH) or 120 nanohenries (nH) | | **Tolerance** | K | ±10% | --- ### 2. Technical Specifications These values are typical for this specific component across major manufacturers (like Bourns or Chilisin): | Parameter | Value | | :--- | :--- | | **Inductance** | 0.12 µH (120 nH) | | **Test Frequency** | 25 MHz | | **Quality Factor (Q min)** | 30 | | **Self-Resonant Frequency (SRF)** | ~320 MHz | | **DC Resistance (DCR max)** | 0.50 Ω | | **Rated Current (max)** | 300 mA | | **Operating Temperature** | -55°C to +125°C | --- ### 3. Key Electronic Features * **Multilayer Construction:** Unlike wire-wound inductors, this part is made by layering ceramic and conductive materials. This results in a monolithic, solid structure that is highly reliable and magnetically shielded. * **High Density:** Provides a high inductance value within a relatively small footprint (1206 package). * **Magnetic Shielding:** The closed magnetic circuit minimizes crosstalk and electromagnetic interference (EMI) with neighboring components on the PCB. * **Soldering Compatibility:** Designed for excellent solderability and heat resistance, suitable for flow or reflow soldering processes. --- ### 4. Common Applications * **Signal Processing:** Used in high-frequency signal lines to filter out noise. * **Power Supplies:** Acts as a decoupling element in low-current DC-DC converter circuits to stabilize voltage. * **Communication Equipment:** Found in mobile phones, Wi-Fi modules, and Bluetooth devices for RF impedance matching. * **Consumer Electronics:** Used in motherboards, tablets, and video cards.