The **DRQ125-101-R** is a high-power, shielded dual-winding inductor (coupled inductor) manufactured by **Eaton (formerly Coiltronics)**. It is part of the DRQ series, known for its versatility in power electronics. --- ### ## Technical Specifications The following table summarizes the key electrical and physical characteristics of the DRQ125-101-R: | Parameter | Value | | :--- | :--- | | **Inductance** | 100 µH (nominal) | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 1.81 Amps | | **Saturation Current (Isat)** | 2.12 Amps | | **DC Resistance (DCR)** | 0.228 Ohms (Typical) | | **Number of Windings** | 2 (Dual) | | **Core Material** | Ferrite | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | 12.5mm x 12.5mm x 6.0mm | --- ### ## Core Features * **Dual Winding Design:** The component features two identical windings that can be connected in series or parallel. This allows it to function as a single inductor, a coupled inductor, or a 1:1 transformer. * **Magnetic Shielding:** The ferrite drum and ring core construction minimize Electromagnetic Interference (EMI), making it suitable for noise-sensitive circuits. * **High Efficiency:** Designed for low core losses and high power density. * **RoHS Compliant:** The "-R" suffix indicates that the part is lead-free and meets RoHS environmental standards. --- ### ## Common Applications The DRQ125-101-R is commonly utilized in the following circuit topologies: 1. **SEPIC Converters:** Used as a coupled inductor to maintain energy flow in Single-Ended Primary-Inductor Converters. 2. **ZETA Converters:** Facilitates voltage transformation and regulation. 3. **Flyback Transformers:** Can act as a small 1:1 transformer for isolated power supplies. 4. **Common Mode Chokes:** When wired appropriately, it can filter common-mode noise in DC-DC power lines. 5. **Multi-phase Buck Converters:** Used to balance current across multiple output phases. --- ### ## Wiring Configurations Depending on how the pins are connected, the electrical properties change: * **Parallel Connection:** Connect pins 1-4 and 2-3. This doubles the current rating but keeps the inductance at 100 µH. * **Series Connection:** Connect pins 2 and 3. This quadruples the inductance (to 400 µH) but maintains the same current rating as a single winding.