The **SD18-101-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, commonly used in DC-DC converters and power management circuits. --- ### 1. Technical Specifications The part number "101" indicates the inductance value, while "R" denotes RoHS compliance. | Parameter | Specification | | :--- | :--- | | **Inductance** | 100 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 0.495 Amps (approx.) | | **Saturation Current (Isat)** | 0.542 Amps (approx.) | | **DC Resistance (DCR)** | 0.702 Ohms (Typical) | | **Shielding** | Magnetically Shielded | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Physical Construction The device is designed for space-constrained environments where electromagnetic interference (EMI) must be minimized. * **Core Material:** Ferrite drum core. * **Shielding:** Integrated ferrite sleeve that closes the magnetic loop, significantly reducing stray magnetic fields. * **Form Factor:** * **Length:** 5.2 mm * **Width:** 5.2 mm * **Height:** 1.8 mm (Low profile) * **Terminations:** Matte tin over copper for excellent solderability. --- ### 3. Functional Features * **EMI Suppression:** Because it is shielded, it can be placed close to sensitive components without causing significant noise interference. * **High Power Density:** Provides high inductance and current handling capability relative to its small 5x5mm footprint. * **Stability:** The ferrite material ensures stable performance across a wide temperature range. --- ### 4. Common Applications The SD18-101-R is typically found in the following electronic systems: 1. **Buck/Boost Converters:** Used as energy storage elements in voltage regulation. 2. **Portable Electronics:** Ideal for smartphones, tablets, and handheld devices due to the 1.8mm height. 3. **LED Drivers:** Used to maintain constant current in lighting circuits. 4. **Computer Peripherals:** Found in SSDs, network cards, and battery management systems (BMS). --- ### 5. Part Number Breakdown ```text SD 18 - 101 - R | | | | | | | +-- RoHS Compliant | | +------- Inductance Code (10 x 10^1 = 100µH) | +------------ Size Code (Height approx 1.8mm) +--------------- Series Name (Shielded Drum) ```