The **DR127-151-R** is a specific part number for a high-power, shielded surface-mount (SMD) inductor manufactured by **Eaton (formerly Coiltronics)**. This component is widely used in power management circuits. --- ### 1. Key Technical Specifications The part number follows a specific nomenclature that defines its physical and electrical characteristics. | Parameter | Specification | | :--- | :--- | | **Inductance** | 150 µH (indicated by "151") | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | ~0.334 Ω (Typical) | | **Rated Current (Irms)** | ~1.36 Amperes | | **Saturation Current (Isat)** | ~1.72 Amperes | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Magnetically Shielded (Low EMI) | --- ### 2. Breakdown of the Part Number Understanding the code helps in identifying similar components within the DR series: * **DR:** Designator for the product series (Drum Core). * **127:** Refers to the physical dimensions (approx. 12.5mm x 12.5mm x 8.0mm). * **151:** The inductance value in Microhenries (µH). The first two digits are significant figures, and the third is the multiplier ($15 \times 10^1 = 150 \mu H$). * **R:** Indicates that the part is RoHS compliant (Lead-free). --- ### 3. Applications and Use Cases Because of its high inductance and power handling capabilities, the DR127-151-R is commonly found in: 1. **DC-DC Converters:** Used as an energy storage element in buck, boost, or SEPIC converters. 2. **Filtering:** Acts as a low-pass filter to smooth out ripples in power supplies. 3. **LED Drivers:** Provides steady current for high-brightness lighting applications. 4. **Industrial Electronics:** Used in motor controls and battery chargers where durability is required. --- ### 4. Physical Characteristics The "DR" series is known for its **shielded construction**. This means the magnetic field is contained within the core, which prevents the inductor from interfering with nearby sensitive components on the PCB (Electromagnetic Interference - EMI). ```markdown Dimensions (Approximate): - Length: 12.5 mm - Width: 12.5 mm - Height: 8.0 mm ```