## Technical Overview of DR124-101-R The **DR124-101-R** is a high-power, shielded surface-mount (SMD) inductor manufactured by Eaton (formerly Coiltronics). It is part of the DR series, specifically designed for high-density applications requiring low electromagnetic interference (EMI). --- ### 1. Key Technical Specifications The following table highlights the critical electronic characteristics of the component: | Parameter | Value | Notes | | :--- | :--- | :--- | | **Inductance** | 100 µH | Rated at 100 kHz, 0.25V | | **Tolerance** | ±20% | Standard manufacturing variance | | **DC Resistance (DCR)** | 0.250 Ω (Max) | Resistance of the internal copper coil | | **Isat (Saturation Current)** | 1.83 A | Current where inductance drops 25% | | **Irms (RMS Current)** | 1.79 A | Current causing a 40°C temperature rise | | **Shielding** | Ferrite Drum Core | Magnetically shielded to reduce EMI | | **Operating Temp** | -40°C to +125°C | Includes self-heating effects | --- ### 2. Physical Construction and Packaging * **Core Material:** Ferrite. The "Drum Core" design provides high saturation levels, while the outer ring provides the magnetic shielding. * **Terminations:** Matte Tin over Copper. This ensures excellent solderability for SMT (Surface Mount Technology) processes. * **Size (Footprint):** The "124" designation refers to the dimensions (approximately 12.5mm x 12.5mm with a height of 4.5mm). * **RoHS Compliant:** The "-R" suffix indicates that the part is lead-free and compliant with environmental regulations. --- ### 3. Common Applications Due to its high inductance and power handling, the DR124-101-R is typically found in: 1. **DC-DC Converters:** Used as an energy storage element in buck, boost, or SEPIC topologies. 2. **Computer Peripherals:** Powering hard drives, servers, and graphics cards. 3. **Industrial Electronics:** Providing noise filtering and voltage regulation in harsh environments. 4. **Consumer Electronics:** High-power LED drivers and battery-operated devices. --- ### 4. Part Number Breakdown * **DR:** Series name (Shielded Drum Core). * **124:** Physical size/dimensions. * **101:** Inductance code (10 + one zero = 100 µH). * **-R:** RoHS compliant.