The **CTLL2012-R47J** is a surface-mount technology (SMT) multi-layer chip inductor. It is commonly used in high-frequency circuits for signal filtering, decoupling, and impedance matching. Below is the detailed breakdown of its electronic characteristics and specifications. --- ### 1. Part Number Deciphering To understand the component, we can break down the manufacturer's code: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **CTLL** | Series | Multi-layer Ceramic Chip Inductor series. | | **2012** | Package Size | Metric 2012 (EIA 0805): 2.0mm x 1.25mm. | | **R47** | Inductance Value | **0.47 µH** (R denotes the decimal point). | | **J** | Tolerance | **±5%** (Standard tolerance for high-precision inductors). | --- ### 2. Technical Specifications These values are typical for the 0805 multi-layer inductor family: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.47 µH | | **Tolerance** | ±5% | | **Test Frequency** | 25 MHz (typical for measurement) | | **DC Resistance (DCR)** | ~0.40 Ω - 0.70 Ω (varies by specific manufacturer) | | **Rated Current (max)** | ~200mA - 300mA | | **Self-Resonant Frequency (SRF)** | >100 MHz | | **Operating Temperature** | -40°C to +85°C / +125°C | --- ### 3. Key Electronic Characteristics * **Multi-layer Construction:** Unlike wire-wound inductors, these are made by layering conductive paste and ceramic material. This results in a monolithic, solid structure that is highly reliable and has excellent magnetic shielding. * **High Q Factor:** Designed to maintain low loss at high frequencies, making it suitable for RF (Radio Frequency) applications. * **Non-Polarized:** As a passive inductor, it can be placed in either orientation on a PCB. * **Compact Footprint:** The 0805 (2012 metric) size is ideal for density-constrained applications like smartphones or wearable tech. --- ### 4. Common Applications Due to its 0.47 µH value and 0805 size, it is typically found in: 1. **RF Circuits:** Matching networks for Bluetooth, Wi-Fi, and cellular modules. 2. **EMI Suppression:** Filtering high-frequency noise in signal lines. 3. **Decoupling:** Preventing noise from feeding back into power rails in low-power digital circuits.