The **DRQ73-R33-R** is a specific electronic component belonging to the **DRQ series** manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). It is a high-power, shielded, dual-winding inductor. --- ## 1. Component Overview The DRQ series are "coupled" inductors, meaning they contain two separate coils wound on a single ferrite core. This allows them to be used as a single inductor, two separate inductors, or as a 1:1 transformer. ### Key Specifications | Parameter | Value | | :--- | :--- | | **Inductance** | 0.33 µH (microhenries) | | **Tolerance** | ±20% | | **Current Rating (Irms)** | ~14.6 A (approximate, varies by wiring) | | **Saturation Current (Isat)** | ~25.5 A (approximate) | | **DC Resistance (DCR)** | ~2.5 mΩ (maximum per winding) | | **Dimensions** | 7.6 x 7.6 x 3.55 mm | --- ## 2. Part Number Breakdown Understanding the nomenclature helps identify the physical and electrical characteristics: * **DRQ:** Dual-winding, Shielded Inductor. * **73:** Size code (approx. 7.6mm width/length, 3.5mm height). * **R33:** Inductance value (R = decimal point; R33 = 0.33 µH). * **R:** RoHS compliant (Lead-free). --- ## 3. Configuration & Wiring Because this part has **two windings**, it can be configured in four primary ways: 1. **Series Connection:** Used to increase total inductance. 2. **Parallel Connection:** Used to increase current handling capacity while maintaining low inductance. 3. **1:1 Transformer:** Used for SEPIC or Flyback converter topologies. 4. **Common Mode Choke:** Used for filtering electromagnetic interference (EMI). ### Connection Logic ```text Winding 1: Pins 1 to 2 Winding 2: Pins 4 to 3 (Pin 1 and 4 are usually the start of the windings, marked by dots) ``` --- ## 4. Common Applications * **DC-DC Converters:** Ideal for SEPIC, Cuk, and Zet converters where two inductors are required in a small footprint. * **Power Supplies:** Used in VRMs (Voltage Regulator Modules) for servers and desktops. * **Filtering:** High-current battery powered systems and industrial controllers. * **Automotive:** Often used in infotainment and LED lighting circuits due to its magnetic shielding.