The **SD14-4R5-R** is a high-performance, low-profile power inductor manufactured by **Eaton (formerly Bussmann)**. It belongs to the SD series of shielded drum core inductors, commonly used in DC-DC converters and power management circuits. --- ### 1. Key Specifications The following table summarizes the primary electrical and physical characteristics of the SD14-4R5-R: | Parameter | Specification | | :--- | :--- | | **Inductance** | 4.5 µH | | **Tolerance** | ±20% | | **Rated Current (Irms)** | 2.21 Amps | | **Saturation Current (Isat)** | 2.56 Amps | | **DC Resistance (DCR)** | 45.4 mΩ (Typical) | | **Shielding** | Magnetically Shielded | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | 5.2mm x 5.2mm x 1.45mm | --- ### 2. Component Composition & Design The "SD14" designation provides specific information about its construction: * **Magnetically Shielded:** The part uses a ferrite drum core with a ferrite sleeve. This contains the magnetic flux, minimizing Electromagnetic Interference (EMI) with neighboring components on the PCB. * **Low Profile:** The "14" in the part number indicates a maximum height of approximately **1.45mm**, making it ideal for thin electronic devices like smartphones, tablets, and wearables. * **Construction:** It features a surface-mount (SMD) design with robust solder pads for high-vibration environments. --- ### 3. Application Use-Cases The SD14-4R5-R is typically found in the following electronic circuits: 1. **Buck/Boost Converters:** Used as the energy storage element in switching power supplies. 2. **Noise Filtering:** Acts as a low-pass filter to smooth out ripple current in power lines. 3. **Battery Powered Devices:** Due to its small footprint and low DCR (which improves efficiency), it is preferred for handheld electronics. 4. **LED Drivers:** Used to maintain constant current flow in backlight or indicator circuits. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in identifying variants: | Segment | Meaning | | :--- | :--- | | **SD** | Series Name (Shielded Drum Core) | | **14** | Size Code (Approx. 5.2 x 5.2 x 1.45mm) | | **4R5** | Inductance Value (4.5 microhenries) | | **-R** | RoHS Compliant / Lead-Free | ---