The **CSBL1250-R45M** is a high-current, surface-mount (SMD) power inductor commonly used in DC-DC converters, voltage regulator modules (VRMs), and power supply circuits. It belongs to a category of "Molded Power Inductors" designed for high efficiency and high-frequency stability. --- ### 1. Part Number Breakdown While specific manufacturer prefixes may vary slightly, the nomenclature typically follows this structure: | Segment | Meaning | Description | | :--- | :--- | :--- | | **CSBL** | Series Type | Often refers to a Shielded, Low-profile design. | | **1250** | Case Size | Typically indicates dimensions (approx. 12.5mm x 12.5mm x 5.0mm). | | **R45** | Inductance Value | **0.45 µH** (R denotes the decimal point). | | **M** | Tolerance | Indicates **±20%** tolerance. | --- ### 2. Technical Specifications Inductors in the 1250 series with an R45 (0.45µH) rating are engineered for high-power density applications. | Feature | Typical Specification | | :--- | :--- | | **Inductance** | 0.45 µH | | **Tolerance** | ±20% | | **Saturation Current (Isat)** | High (Typically 30A - 50A range depending on thermal rise) | | **DC Resistance (DCR)** | Extremely Low (often < 1.0 mΩ) | | **Operating Temperature** | -40°C to +125°C (standard) | | **Shielding** | Magnetic Shielding (reduces EMI) | --- ### 3. Key Electronic Characteristics * **Saturation Current ($I_{sat}$):** This is the current level where the inductance drops (usually by 20-30%). The CSBL1250 series uses a metal alloy powder core, providing a "soft saturation" curve, which prevents sudden circuit failure during current spikes. * **Low DCR:** Because the value is only 0.45 µH, the internal copper windings are thick. This results in very low Direct Current Resistance (DCR), minimizing power loss through heat ($P = I^2R$). * **Magnetic Shielding:** The molded construction encapsulates the windings in a magnetic metal powder, which significantly reduces electromagnetic interference (EMI) to surrounding components. --- ### 4. Common Applications ```c // Typical use cases in electronic design: 1. Multi-phase Buck Converters (CPU/GPU Power) 2. High-current Point-of-Load (POL) modules 3. Distributed Power Systems 4. Battery-powered devices requiring high efficiency ``` ---