The **DR359-1-104** is a specific type of electronic component, primarily categorized as a **Surface Mount (SMD) Power Inductor**. These parts are commonly used in power management circuits to store energy in a magnetic field. --- ### 1. Technical Specifications The part number follows a specific nomenclature that defines its electrical characteristics. Here is a breakdown of the typical specifications for this component: | Parameter | Value / Description | | :--- | :--- | | **Component Type** | Power Inductor (Unshielded/Shielded) | | **Inductance** | 100 µH (Microhenries) | | **Tolerance** | ±10% or ±20% (Common for this series) | | **Mounting Type** | Surface Mount Device (SMD) | | **DCR (DC Resistance)** | Approx. 0.5 - 1.2 Ohms (Typical) | | **Saturation Current** | Varies by package size (Typically 0.5A - 1.5A) | ### 2. Part Number Breakdown The suffix **"104"** is the most critical part of the identification code, representing the inductance value in picofarads (pF) or, in the case of inductors, a standard 3-digit code: * **10**: The first two significant digits. * **4**: The multiplier (number of zeros). * **Calculation**: $10 \times 10^4$ = 100,000 nH = **100 µH**. --- ### 3. Key Applications The DR359 series is designed for efficiency in compact power electronics. Typical use cases include: * **DC-DC Converters:** Used as the energy storage element in buck or boost regulators. * **Filtering:** Acts as a low-pass filter to remove high-frequency noise from power lines. * **Battery Powered Devices:** Ideal for laptops, tablets, and handheld instruments due to its low profile. * **LED Drivers:** Used to stabilize current flowing through high-power LEDs. ### 4. Typical Footprint and Construction The DR359 series usually features a drum core construction. ```yaml Construction: Core Material: Ferrite Wire: Enameled Copper Terminals: Sn/Ag/Cu (Lead-free) Body Style: Circular or Square base (SMD pads) ``` --- ### 5. Selection Precautions When replacing or designing with the DR359-1-104, consider these factors: 1. **Saturation Current ($I_{sat}$):** Ensure the peak current in your circuit does not exceed the saturation point, or the inductance will drop sharply. 2. **Self-Resonant Frequency (SRF):** Ensure the operating frequency of your circuit is well below the SRF of the inductor. 3. **Thermal Management:** The DC Resistance (DCR) will cause the part to heat up; verify that the airflow or PCB heat-sinking is sufficient for the rated current.