The **DR124-271-R** is a high-power, shielded surface-mount (SMD) inductor manufactured by Eaton (formerly Bussmann). It belongs to the DR series, which is characterized by high power density and excellent thermal stability. --- ### ## 1. Technical Specifications The part number "271" indicates the inductance value, while the "R" denotes RoHS compliance. | Parameter | Specification | | :--- | :--- | | **Inductance** | 270 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.490 Ω (Typical) | | **Rated Current (Irms)** | 0.98 Amps | | **Saturation Current (Isat)** | 1.15 Amps | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Magnetically Shielded | --- ### ## 2. Physical Characteristics The DR124 series uses a specific footprint that allows for automated assembly. * **Core Material:** Ferrite drum core with a plastic base. * **Shielding:** The magnetic shielding minimizes Electromagnetic Interference (EMI), making it suitable for densely packed circuit boards. * **Dimensions:** * Length/Width: ~12.5 mm x 12.5 mm * Height: ~4.5 mm (Max) --- ### ## 3. Common Applications Due to its high inductance and power handling capabilities, the DR124-271-R is commonly found in the following circuits: 1. **DC-DC Converters:** Used in buck, boost, and SEPIC topologies for voltage regulation. 2. **Power Supplies:** Common in laptop adapters, battery chargers, and industrial power modules. 3. **Noise Filtering:** Acts as a low-pass filter to smooth out ripples in power lines. 4. **LED Drivers:** Used to maintain constant current flow in high-brightness LED applications. --- ### ## 4. Part Number Breakdown Understanding the nomenclature helps in identifying similar parts: * **DR:** Series name (Drum Core/Shielded). * **124:** Size code (approx. 12mm x 4mm height). * **271:** Inductance code ($27 \times 10^1$ = 270 µH). * **R:** RoHS compliant (Lead-free). ---