The **SD18-150-R** is a high-performance, low-profile power inductor manufactured by Eaton (formerly Bussmann). It belongs to the SD series of surface-mount (SMD) shielded drum core inductors. --- ## 1. Technical Specifications The following table summarizes the core electrical and physical characteristics of the SD18-150-R: | Parameter | Value | | :--- | :--- | | **Inductance** | 15.0 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.0881 Ω (Max) | | **Rated Current ($I_{rms}$)** | 1.34 Amps | | **Saturation Current ($I_{sat}$)** | 1.58 Amps | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Ferrite Shielded | --- ## 2. Key Features and Design ### Ferrite Core Construction The "SD" stands for Shielded Drum. The inductor uses a ferrite core that is magnetically shielded. This design minimizes **Electromagnetic Interference (EMI)**, ensuring that the magnetic fields generated by the inductor do not interfere with nearby sensitive components on the PCB. ### Low Profile Physicality The "18" in the part number refers to the package size (roughly 5.2mm x 5.2mm) and the low profile (1.8mm height). This makes it ideal for compact electronic devices where vertical space is limited. ### Material Composition * **Core:** Ferrite * **Wire:** Enameled Copper * **Terminals:** Matte Tin over Copper * **RoHS Compliant:** The "-R" suffix indicates compliance with RoHS standards (Lead-free). --- ## 3. Common Applications Due to its balance of size, current handling, and shielding, the SD18-150-R is commonly found in: 1. **DC-DC Converters:** Used as energy storage elements in buck, boost, or buck-boost regulators. 2. **Portable Electronics:** Smartphones, tablets, and handheld gaming consoles. 3. **Computer Peripherals:** SSDs, network cards, and compact power modules. 4. **LED Drivers:** Providing stable current for lighting applications. --- ## 4. Typical Footprint Recommendation When designing a PCB for this part, the landing patterns usually follow these dimensions: ```text [ 5.2 mm ] +-------------+ --- | [PAD] | | | | 5.2 mm | [PAD] | | +-------------+ --- (H: 1.8mm) ```