The **DR127-100-R** is a specific model of a power inductor manufactured by Eaton (formerly Cooper Bussmann). It belongs to the **DR Series** of high-power density, shielded drum core inductors. --- ## 1. Technical Specifications The following table summarizes the key electrical and physical characteristics of the DR127-100-R: | Parameter | Specification | | :--- | :--- | | **Inductance** | 10.0 µH | | **Tolerance** | ±20% | | **Rated Current (Typical)** | 5.28 Amps | | **Saturation Current ($I_{sat}$)** | 8.00 Amps | | **DC Resistance (DCR)** | 0.0216 Ohms (Max) | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Magnetically Shielded | | **Package Size** | 12.5mm x 12.5mm x 8.0mm | --- ## 2. Key Component Features ### A. Magnetic Shielding The "DR" series utilizes a ferrit drum core with a ferrite sleeve. This **shielded construction** minimizes Electromagnetic Interference (EMI), which is critical for densely packed circuit boards where noise can affect nearby components. ### B. High Power Density The part is designed to handle high current levels relative to its footprint. The "127" in the part number refers to the physical size (approximately 12.5mm x 12.5mm x 7mm/8mm height). ### C. Construction Material * **Core:** Ferrite * **Wire:** Enameled Copper * **Terminals:** Matte Tin over Copper --- ## 3. Applications The DR127-100-R is primarily used in power management circuits where voltage conversion is necessary. Common applications include: 1. **DC-DC Converters:** Buck (step-down), Boost (step-up), and SEPIC topologies. 2. **Voltage Regulator Modules (VRMs):** Used in computing and telecommunications. 3. **Industrial Electronics:** Providing stable power to sensors and controllers. 4. **Consumer Electronics:** High-power LED drivers and battery-powered devices. --- ## 4. Part Number Breakdown Understanding the nomenclature helps in selecting variants: | Segment | Meaning | | :--- | :--- | | **DR** | Series Name (Drum Core, Shielded) | | **127** | Size Code (12.5 x 12.5 x 8.0 mm) | | **100** | Inductance Code ($10 \times 10^0 = 10 \mu H$) | | **-R** | RoHS Compliant |