The **DR124-270-R** is a high-power, shielded surface-mount (SMD) inductor manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). It is part of the DR series, known for high efficiency and a robust drum core construction. --- ### ## 1. Technical Specifications The following table summarizes the key electrical and physical characteristics of the DR124-270-R: | Parameter | Value | | :--- | :--- | | **Inductance** | 27 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.0528 Ohms (Max) | | **Rated Current (Irms)** | 3.16 Amps | | **Saturation Current (Isat)** | 3.42 Amps | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Magnetically Shielded | | **Package Size** | 12.5mm x 12.5mm x 4.5mm | --- ### ## 2. Core Components and Materials The "DR" designation refers to its **Drum Core** design. The part consists of several critical electronic elements: * **Ferrite Core:** High-density ferrite material that provides high permeability while minimizing core losses at high frequencies. * **Copper Wire:** Precision-wound enameled copper wire. The thickness of this wire determines the DC resistance (DCR) and the current-carrying capacity. * **Magnetic Shield:** A ferrite sleeve surrounds the winding. This prevents electromagnetic interference (EMI) from affecting nearby components and contains the magnetic flux within the inductor. * **Solder Pads:** Large, robust pads designed for stable reflow soldering on Printed Circuit Boards (PCBs). --- ### ## 3. Common Applications Due to its high current rating and shielding, the DR124-270-R is typically found in: 1. **DC-DC Converters:** Acts as an energy storage element in Buck, Boost, and SEPIC converters. 2. **Power Supplies:** Used for input/output filtering to reduce ripple and noise. 3. **Consumer Electronics:** Found in laptops, LED drivers, and game consoles where space and EMI management are critical. 4. **Industrial Equipment:** Utilized in motor control circuits and distributed power systems. --- ### ## 4. Understanding the Part Number `DR124-270-R` * **DR:** Product Series (Drum Core Inductor). * **124:** Size code (approx. 12mm width/length and 4mm height). * **270:** Inductance code. The first two digits (27) are the value, and the third (0) is the multiplier. $27 \times 10^0 = 27$ µH. * **-R:** RoHS compliant.