The **SD18-330-R** is a high-performance, low-profile power inductor manufactured by **Eaton (formerly Bussmann/Coiltronics)**. It is part of the SD18 series, known for its shielded construction and surface-mount (SMD) design. --- ### ## Technical Specifications The following table summarizes the key electrical and physical characteristics of the SD18-330-R: | Parameter | Value | | :--- | :--- | | **Inductance** | 33.0 µH | | **Tolerance** | ±20% | | **Rated Current (Irms)** | 0.81 Amps | | **Saturation Current (Isat)** | 0.94 Amps | | **DC Resistance (DCR)** | 0.288 Ohms (Typical) | | **Operating Temperature** | -40°C to +125°C | | **Dimensions (LxWxH)** | 5.2mm x 5.2mm x 1.8mm | | **Shielding** | Magnetically Shielded | --- ### ## Core Electronic Features #### 1. Magnetic Shielding The component is **magnetically shielded**. This is a critical feature for high-density circuit boards because it minimizes Electromagnetic Interference (EMI). The shielding ensures that the magnetic field generated by the inductor does not interfere with adjacent sensitive components. #### 2. Low Profile Design With a height of only **1.8mm**, this part is ideal for ultra-thin electronic devices where vertical space is limited, such as smartphones, tablets, and wearable technology. #### 3. Ferrite Core Construction The use of a ferrite core provides high efficiency and low core losses at high frequencies. This makes it suitable for modern high-speed switching power supplies. --- ### ## Common Applications The SD18-330-R is primarily used in power management circuits, including: * **DC-DC Converters:** Buck, Boost, and SEPIC topologies. * **Battery Powered Devices:** Due to its small footprint and efficiency. * **LED Drivers:** Providing stable current for lighting applications. * **Computer Peripherals:** Used on motherboards and graphic cards for local voltage regulation. --- ### ## Part Number Breakdown The nomenclature for this series follows a specific logic: * **SD:** Series name (Shielded Drum). * **18:** Dimensional size code (approx. 5.2 x 5.2 x 1.8 mm). * **330:** Inductance value code (33 + 0 zeros = **33 µH**). * **-R:** RoHS compliant / Lead-free.