The **CTLL2012-R15J** is a surface-mount (SMD) wire-wound chip inductor. It is a passive electronic component designed to store energy in a magnetic field and provide inductance in high-frequency circuits. --- ### 1. Technical Specifications The part number follows a specific nomenclature used by manufacturers (typically **Central Technologies**). Below are the primary specifications: | Parameter | Value | | :--- | :--- | | **Inductance** | 0.15 µH (150 nH) | | **Tolerance** | ±5% (indicated by 'J') | | **Case Size** | 0805 (Metric 2012) | | **DC Resistance (DCR)** | ~0.40 - 0.60 Ω (Max) | | **Rated Current** | ~450 mA | | **Self-Resonant Frequency (SRF)** | > 500 MHz | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Physical Characteristics (2012/0805) The "2012" designation refers to the physical dimensions of the component in metric units, which corresponds to the "0805" imperial size. * **Length:** 2.0 mm * **Width:** 1.25 mm * **Height:** ~1.2 mm * **Construction:** Wire-wound on a ceramic or ferrite core for high stability and Q-factor. --- ### 3. Key Features & Applications This specific inductor is chosen for its performance in high-frequency environments where precision and low signal loss are required. * **High Q Factor:** Because it is wire-wound, it offers a higher Quality (Q) factor compared to multilayer inductors of the same size. * **Applications:** * **RF Tuning:** Used in impedance matching and resonance circuits. * **Filtering:** Acts as a low-pass or band-pass filter to remove noise. * **Wireless Communication:** Common in Bluetooth, Wi-Fi, and cellular modules. * **Signal Decoupling:** Preventing high-frequency noise from entering sensitive power rails. --- ### 4. Part Number Breakdown Understanding the code helps in identifying substitutes: | Segment | Meaning | | :--- | :--- | | **CTLL** | Series Code (Low Profile/Chip Inductor) | | **2012** | Size (2.0mm x 1.25mm) | | **R15** | Inductance Value (R acts as a decimal: 0.15 µH) | | **J** | Tolerance Code (J = ±5%) |