## Technical Overview: DR1040-330-R The **DR1040-330-R** is a high-performance, surface-mount (SMT) power inductor manufactured by **Eaton (formerly Coiltronics/Bussmann)**. It belongs to the DR series, which is known for its high power density and shielded construction. ### 1. Key Specifications Below are the primary electrical and physical characteristics of the component: | Parameter | Value | | :--- | :--- | | **Inductance** | 33 $\mu$H | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.0768 $\Omega$ (Max) | | **Rated Current (Irms)** | 2.06 A | | **Saturation Current (Isat)** | 2.50 A | | **Package / Case** | 10.5mm x 10.3mm x 4.0mm | | **Shielding** | Shielded (Magnetic) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Core Features * **Magnetically Shielded:** The part is designed with a ferrite drum core and a ferrite ring. This minimizes Electromagnetic Interference (EMI), making it suitable for noise-sensitive circuits. * **High Power Density:** Provides a high current-carrying capacity relative to its 4.0mm height profile. * **Low Core Loss:** Optimized for high-frequency applications, reducing energy wasted as heat. * **RoHS Compliant:** The "-R" suffix indicates that the part is lead-free and compliant with environmental standards. --- ### 3. Common Applications The DR1040-330-R is typically used in power management circuits where voltage needs to be stepped up or down efficiently. * **DC-DC Converters:** Buck, Boost, and SEPIC topologies. * **Computer Hardware:** Used in motherboards and graphic cards for local voltage regulation. * **Telecommunications:** Power supplies for base stations and networking gear. * **Battery Powered Devices:** Handheld electronics requiring efficient energy conversion. --- ### 4. Footprint Information When designing a PCB (Printed Circuit Board), the footprint for this component generally follows these dimensions: ```text Dimensions (mm): L: 10.5 +/- 0.3 W: 10.3 +/- 0.3 H: 4.0 Max Land Pattern (Typical): Pad Width: 3.6 mm Pad Length: 3.0 mm Gap: 5.3 mm ```