### SD12-1R5-R Component Analysis The **SD12-1R5-R** is a high-power density, low-profile, shielded drum core inductor manufactured by **Eaton (formerly Bussmann)**. It belongs to the SD series, which is designed for applications where space is limited and EMI (Electromagnetic Interference) shielding is required. --- ### 1. Technical Specifications Below are the primary electrical and physical characteristics: | Parameter | Value | | :--- | :--- | | **Inductance** | 1.5 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.038 Ω (Typical) | | **Saturation Current ($I_{sat}$)** | 2.57 A | | **RMS Current ($I_{rms}$)** | 2.12 A | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | SMD (5.2mm x 5.2mm x 1.2mm) | | **Shielding** | Ferrite Core (Shielded) | --- ### 2. Key Internal & External Features * **Magnetic Shielding:** The component features a ferrite drum core with a magnetic epoxy resin shroud. This minimizes leaked magnetic flux, preventing interference with nearby sensitive components on the PCB. * **Low Profile:** The "12" in the part number indicates a maximum height of approximately **1.2 mm**, making it ideal for ultra-thin electronics like smartphones or wearable tech. * **Construction:** It uses a flat-top surface suitable for high-speed automated "pick and place" assembly. * **Material:** It is lead-free, halogen-free, and RoHS compliant. --- ### 3. Application Use Cases This specific inductor is typically found in DC-DC converter circuits. * **Buck Converters:** Used as the energy storage element in step-down voltage regulators. * **Battery Powered Devices:** Due to its small footprint, it is common in tablets, digital cameras, and handheld GPS units. * **Filter Inductor:** Used in LC filters to smooth out ripple current in power supplies. --- ### 4. Part Number Breakdown The nomenclature for the **SD12-1R5-R** is defined as follows: 1. **SD:** Series name (Shielded Drum Core). 2. **12:** Size code (refers to the ~1.2mm height). 3. **1R5:** Inductance value ($1.5$ microhenries). 4. **-R:** RoHS compliance suffix. ---