The **3316-R** designation typically refers to a specific series of **High-Power Surface Mount (SMD) Inductors**. These are widely used in power management circuits to store energy and filter noise. --- ### 1. General Specifications The "3316" refers to the physical dimensions of the component (Industry Standard Size), while the "-R" usually signifies that the part is **RoHS compliant** (lead-free). | Feature | Typical Specification | | :--- | :--- | | **Mounting Type** | Surface Mount Device (SMD/SMT) | | **Inductance Range** | 1.0 µH to 1000 µH (Common range) | | **Current Rating** | Up to 9.0 Amps (Depending on inductance) | | **Operating Temp** | -40°C to +125°C | | **Core Material** | Ferrite | ### 2. Physical Dimensions The numerical code represents the footprint in millimeters (approximately): * **Length:** ~12.95 mm * **Width:** ~9.40 mm * **Height:** ~5.21 mm ### 3. Key Characteristics * **High Current Capability:** Designed to handle significant DC currents without saturating the ferrite core. * **Low DC Resistance (DCR):** Minimizes power loss as heat, increasing the efficiency of the power supply. * **Robust Construction:** Features a flat top suitable for automated "pick and place" assembly machines. * **Shielding:** Some versions are unshielded (drum core), while others may have magnetic shielding to reduce Electromagnetic Interference (EMI). ### 4. Common Applications These inductors are essential in modern electronics for voltage regulation: 1. **DC-DC Converters:** Used in "Buck" (step-down) or "Boost" (step-up) converters. 2. **Power Supplies:** Found in laptop adapters, server power rails, and industrial electronics. 3. **Filtering:** Used in input/output filters to smooth out ripple current and reduce noise in audio or communication equipment. --- ### 5. Example Part Number Breakdown If you see a part labeled **3316-102-R**: * **3316**: The physical size/series. * **102**: The inductance value (10 followed by 2 zeros = 1000 µH). * **R**: RoHS compliant.