The **SD14-331-R** is a high-power density, low-profile inductor part of the SD series manufactured by **Eaton (formerly Bussmann/Coiltronics)**. It is primarily used for power management applications where space is limited. --- ## 1. Technical Specifications The part number follows a specific nomenclature. In this case, **331** represents the inductance value, and **R** indicates RoHS compliance. | Parameter | Specification | | :--- | :--- | | **Inductance** | 330 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | ~1.67 Ω (Typical) | | **Rated Current (Irms)** | ~0.35 Amps | | **Saturation Current (Isat)** | ~0.39 Amps | | **Dimensions** | 5.2mm x 5.2mm x 1.45mm | | **Mounting Type** | Surface Mount (SMD/SMT) | --- ## 2. Key Features * **Low Profile:** With a height of only 1.45mm, it is ideal for ultra-thin electronics like smartphones or wearable tech. * **Magnetic Shielding:** It is a shielded drum core inductor, which minimizes Electromagnetic Interference (EMI) with surrounding components. * **Ferrite Core:** Utilizes a ferrite core material for high efficiency and low core losses at switching frequencies. * **Power Density:** Designed to handle high current relative to its very small footprint. --- ## 3. Typical Applications The SD14-331-R is commonly found in the following circuits: 1. **DC-DC Converters:** Used as an energy storage element in Buck, Boost, or SEPIC converters. 2. **Backlight Drivers:** Providing constant current for LED displays. 3. **Portable Electronics:** Tablets, digital cameras, and handheld medical devices. 4. **Noise Filtering:** Acting as a low-pass filter to clean power rails from high-frequency switching noise. --- ## 4. Footprint and Land Pattern When designing a PCB for this part, the pads are typically square with a gap in the middle to accommodate the inductor body. ```markdown [ Pad ] --- 2.0mm --- [ Pad ] | | 2.2mm 2.2mm ```