## DRA127-331-R Component Analysis The **DRA127-331-R** is a high-power, shielded drum core inductor manufactured by **Eaton (formerly Cooper Bussmann)**. It is part of the DRA series, which is specifically designed for high-power density and high-temperature environments, such as automotive and industrial applications. --- ### 1. Key Technical Specifications The part number follows a specific nomenclature where "331" represents the inductance value. | Parameter | Value | | :--- | :--- | | **Inductance** | 330 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.548 Ω (Typical) | | **Irms (Rated Current)** | 1.15 A | | **Isat (Saturation Current)** | 1.51 A | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Magnetically Shielded | --- ### 2. Physical Characteristics The "127" in the part number refers to the physical dimensions of the component. * **Package Type:** Surface Mount Device (SMD). * **Dimensions:** Approximately 12.5mm x 12.5mm with a height of 8.0mm. * **Construction:** Ferrite core with copper wire, featuring a magnetic shield to reduce Electromagnetic Interference (EMI). * **Compliance:** Usually AEC-Q200 qualified (Automotive grade). --- ### 3. Application Use Cases This specific inductor is used in power management circuits where stable inductance and EMI suppression are critical. * **DC-DC Converters:** Used as an energy storage element in buck, boost, or SEPIC converters. * **Automotive Electronics:** Powering infotainment systems, LED lighting, or ECU power supplies. * **Industrial Power Supplies:** High-density power modules where space is limited but power requirements are high. * **Noise Filtering:** Acting as a low-pass filter to smooth out output voltage ripples. --- ### 4. Part Number Breakdown ```text DRA 127 - 331 - R | | | | | | | +-- RoHS Compliant | | +--------- Inductance Code (33 + 1 zero = 330µH) | +---------------- Size Dimension (12.5mm x 8.0mm) +--------------------- Series Name (Dual Winding/Shielded) ```