The **DR127-680-R** is a specific model of power inductor manufactured by Eaton (formerly Bussmann). It belongs to the **DR Series**, which is known for its high power density and shielded construction. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify the component's specific characteristics: | Segment | Meaning | Description | | :--- | :--- | :--- | | **DR** | Series Name | Dual Winding/Drum Core inductor series | | **127** | Size Code | Approximately 12.5mm x 12.5mm x 8.0mm | | **680** | Inductance Value | 68 µH (68 followed by 0 zeros) | | **-R** | RoHS Compliant | Lead-free and environmentally compliant | --- ### 2. Key Technical Specifications The DR127 series is designed for durability and efficiency in power conversion circuits. | Parameter | Value | | :--- | :--- | | **Inductance** | 68 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | ~0.151 Ohms (Typical) | | **Rated Current (Irms)** | ~2.11 Amperes | | **Saturation Current (Isat)** | ~2.55 Amperes | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Ferrite Drum Core (Shielded) | --- ### 3. Core Features & Construction * **Magnetic Shielding:** The component is magnetically shielded, which minimizes Electromagnetic Interference (EMI). This is critical for densely packed PCBs where components are close to sensitive analog signals. * **High Power Density:** The "127" size provides a high current-carrying capacity relative to its footprint. * **Surface Mount (SMD):** Designed for automated pick-and-place assembly. * **Drum Core Design:** The ferrite core construction allows for a high saturation point, meaning it can handle current spikes without the inductance dropping significantly. --- ### 4. Common Applications This part is typically found in power management stages of electronic devices: 1. **DC-DC Converters:** Used as an energy storage element in Buck (step-down), Boost (step-up), and SEPIC converters. 2. **Voltage Regulator Modules (VRMs):** Found in laptops and desktop motherboards. 3. **LED Drivers:** Used to maintain constant current for high-brightness LEDs. 4. **Noise Filtering:** Acts as a low-pass filter to smooth out ripples in power supplies. --- ### 5. Example Circuit Implementation In a standard Buck converter circuit, the DR127-680-R would be placed between the switching node and the output capacitor. ```spice * Simple Buck Stage Representation Vin -- [Switch/MOSFET] --+-- [DR127-680-R] --+-- Vout | | [Diode] [Capacitor] | | GND GND ```