## Technical Overview of DRA127-101-R The **DRA127-101-R** is a high-power, shielded drum core inductor manufactured by **Eaton (formerly Bussmann/Coiltronics)**. It is part of the DRA series, which is specifically designed for high-temperature and high-reliability environments, such as automotive and industrial power supplies. --- ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Inductance** | 100 µH | | **Inductance Tolerance** | ±20% | | **Current Rating (Irms)** | 2.16 Amperes | | **Saturation Current (Isat)** | 2.47 Amperes | | **DC Resistance (DCR)** | 148 mΩ (Max) | | **Operating Temperature** | -40°C to +165°C | | **Mounting Type** | Surface Mount (SMD) | | **Size / Dimension** | 12.5mm x 12.5mm x 8.0mm | --- ### 2. Physical Construction and Features * **Shielded Construction:** The inductor features a magnetic shield, which reduces Electromagnetic Interference (EMI) and prevents the magnetic field from interfering with neighboring components. * **Drum Core Design:** The "127" in the part number signifies the size (roughly 12.5mm wide and 7mm-8mm high). The drum core allows for high power density. * **Automotive Grade:** It is **AEC-Q200** qualified, meaning it has passed rigorous stress tests for mechanical shock, vibration, and thermal cycling. * **Material:** The "R" suffix indicates that the part is RoHS compliant (lead-free). --- ### 3. Applications and Usage The DRA127-101-R is typically found in power management circuits where high inductance and high-temperature stability are required: 1. **Buck/Boost Converters:** Used as an energy storage element in DC-DC converters to smooth out voltage ripples. 2. **Automotive Electronics:** Engine control units (ECUs), LED lighting drivers, and infotainment systems. 3. **Industrial Controls:** Power supplies for factory automation that operate in hot environments. 4. **Filters:** Used in input/output filter circuits to reduce noise in power lines. --- ### 4. Interpretation of the Part Number * **DRA:** Series name (High power, shielded, high temp). * **127:** Case size (12.5mm x 12.5mm x 8.0mm). * **101:** Inductance code (10 + one zero = 100 µH). * **R:** RoHS compliant.