### Electronic Specifications: DRQ127-2R2-R The **DRQ127-2R2-R** is a high-power, shielded, dual-winding inductor (coupled inductor) manufactured by **Eaton (formerly Bussmann)**. It belongs to the DRQ series, which is designed for applications requiring high power density and efficiency. --- ### 1. Key Technical Specifications Below are the primary electrical characteristics of the component: | Parameter | Value / Description | | :--- | :--- | | **Inductance** | 2.2 µH | | **Inductance Tolerance** | ±20% | | **Number of Windings** | 2 (Dual Winding) | | **Rated Current (Irms)** | 11.4 A (Parallel) | | **Saturation Current (Isat)** | 18.2 A (Parallel) | | **DC Resistance (DCR)** | 5.61 mΩ (Max per winding) | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Magnetically Shielded | | **Mounting Type** | Surface Mount (SMD) | --- ### 2. Functional Configuration Because this is a **Dual Winding** inductor, it can be configured in three primary ways depending on how the pins are connected to the PCB: 1. **Series Connection:** The two windings are connected in series. This quadruples the inductance ($4 \times L$) but maintains the same current rating as a single winding. 2. **Parallel Connection:** The two windings are connected in parallel. This keeps the inductance the same ($L$) but doubles the current capacity. 3. **Transformer/Coupled Mode:** The windings are kept separate to act as a 1:1 transformer or SEPIC inductor. --- ### 3. Application Use Cases This specific part is commonly found in: * **DC-DC Converters:** Specifically **SEPIC** (Single-Ended Primary-Inductor Converter) or **ZETA** topologies. * **Power Supplies:** Used as a high-efficiency output filter inductor. * **Voltage Regulator Modules (VRMs):** Common in computer and telecommunications hardware. * **Common Mode Chokes:** Can be used to filter noise in power lines. --- ### 4. Physical Dimensions The "127" in the part number refers to the package size: * **Footprint:** Approximately 12.5mm x 12.5mm. * **Height:** 8.0mm maximum. --- ### 5. Part Number Breakdown ```text DRQ 127 - 2R2 - R | | | | | | | └─ RoHS Compliant | | └─────── Inductance Value (2.2 µH) | └───────────── Size Code (12.5mm x 12.5mm x 8.0mm) └───────────────── Series Name (Dual Winding Shielded Inductor) ```