The **SD18-220-R** is a high-performance, low-profile, shielded surface-mount (SMD) power inductor. It is part of the SD series manufactured by **Eaton (formerly Cooper Bussmann/Coiltronics)**. --- ### ## Technical Specifications Below are the key electrical and physical characteristics of the SD18-220-R: | Parameter | Specification | | :--- | :--- | | **Inductance** | 22 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 1.13 Amps (Typical) | | **Saturation Current (Isat)** | 1.05 Amps | | **DC Resistance (DCR)** | 0.177 Ohms (Typical) | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | 5.2mm x 5.2mm x 1.8mm | | **Shielding** | Magnetically Shielded | --- ### ## Key Features 1. **Magnetic Shielding:** The component is shielded, which minimizes Electromagnetic Interference (EMI). This is critical for densely packed circuit boards where noise can affect nearby components. 2. **Low Profile:** With a height of only 1.8mm, it is designed for "thin" electronics like smartphones, tablets, and portable medical devices. 3. **Ferrite Core Construction:** Provides high efficiency and low core losses at high switching frequencies. 4. **Lead-Free/RoHS Compliant:** The "R" suffix in the part number indicates compliance with RoHS standards. --- ### ## Common Applications The SD18-220-R is primarily used in power management circuits: * **DC-DC Converters:** Used as an energy storage element in Buck (step-down) or Boost (step-up) converters. * **Battery Powered Devices:** Ideal for handheld electronics due to its small footprint and efficiency. * **LCD Displays:** Used in backlight driving circuits. * **Computer Peripherals:** Found in SSDs, network cards, and compact storage devices. --- ### ## Naming Convention Breakdown `SD` `18` - `220` - `R` * **SD:** Product Series (Shielded Drum Core). * **18:** Size code (refers to the 1.8mm height). * **220:** Inductance value in Microhenries (22 followed by 0 zeros = 22µH). * **R:** RoHS compliant. ---