The **DR127-101-R** is a specific model of high-power shielded inductor manufactured by **Eaton (formerly Coiltronics)**. It is widely used in power management circuits due to its high efficiency and robust design. --- ## 1. Technical Specifications Below are the primary electrical and physical characteristics of the DR127-101-R: | Parameter | Value | | :--- | :--- | | **Inductance** | 100 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.201 Ohms (Max) | | **Rated Current (Irms)** | 1.76 Amperes | | **Saturation Current (Isat)** | 2.11 Amperes | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Magnetically Shielded | | **Mounting Type** | Surface Mount (SMD) | --- ## 2. Key Features The DR127 series is engineered for high-performance power electronics: * **Magnetically Shielded:** The drum core is enclosed in a ferrite sleeve, which minimizes Electromagnetic Interference (EMI) and prevents the inductor from affecting nearby sensitive components. * **High Power Density:** Designed to handle significant current in a relatively small footprint (approx. 12.5mm x 12.5mm). * **Low Core Loss:** Uses a ferrite core material that reduces energy dissipation as heat, making it suitable for high-frequency switching. * **RoHS Compliant:** The "-R" suffix indicates that the part is lead-free and meets environmental safety standards. --- ## 3. Common Applications This inductor is typically found in the following circuits: 1. **DC-DC Converters:** Acts as the energy storage element in Buck (step-down), Boost (step-up), and SEPIC converters. 2. **Power Supplies:** Used in industrial, computer, and consumer electronics for voltage regulation. 3. **Noise Filtering:** Functions as a low-pass filter to smooth out ripples in power lines. 4. **LED Drivers:** Provides stable current regulation for lighting systems. --- ## 4. Part Number Breakdown Understanding the nomenclature helps in selecting alternatives: * **DR:** Drum Core series. * **127:** Physical size (12.5mm x 12.5mm footprint, 8.0mm height). * **101:** Inductance code ($10 \times 10^1 = 100$ µH). * **R:** RoHS compliant. ---