The **SRP1235-R15M** is a high-current, shielded power inductor manufactured by Bourns. It is designed for applications requiring high reliability and efficiency, such as DC/DC converters in laptops, servers, and automotive electronics. ### 1. Key Technical Specifications The part number follows a specific naming convention that defines its physical and electrical characteristics. | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.15 µH | | **Tolerance** | ±20% | | **Inductance Code** | R15 (0.15) | | **Indication Current (Irms)** | 43 Amperes | | **Saturation Current (Isat)** | 56 Amperes | | **DC Resistance (DCR)** | 0.6 mΩ (Max) | | **Operating Temperature** | -40°C to +125°C | | **Dimensions (L x W x H)** | 13.5 x 12.5 x 3.5 mm | --- ### 2. Physical Construction and Features The SRP1235 series is built using advanced materials to handle high power densities: * **Carbonyl Powder Core:** The inductor uses a metal alloy powder core. This provides a "soft" saturation characteristic, meaning the inductance drops gradually rather than abruptly when current exceeds the rated limit. * **Magnetic Shielding:** The molded construction provides excellent magnetic shielding, which minimizes electromagnetic interference (EMI) with neighboring components. * **Low DCR:** With a maximum resistance of only 0.6 milliohms, this part minimizes power loss due to heat, significantly increasing the efficiency of power supplies. * **Flat Wire / Lead Frame:** The internal structure uses thick conductors to handle the 40A+ current levels without melting or excessive voltage drop. --- ### 3. Part Number Breakdown: SRP1235-R15M To understand the specific variant, the code is decoded as follows: | Code | Meaning | | :--- | :--- | | **SRP** | Series Name (High Current Shielded Inductor) | | **1235** | Footprint and Height (12mm wide, 3.5mm high) | | **R15** | Value: 0.15 Microhenries (R acts as a decimal point) | | **M** | Tolerance: ±20% | --- ### 4. Typical Applications * **Voltage Regulator Modules (VRM):** Used in CPU/GPU power delivery. * **DC/DC Converters:** Point-of-load (POL) power supplies. * **Battery Powered Devices:** High-efficiency power management for portable tech. * **Automotive:** Infotainment systems and lighting (Note: ensure AEC-Q200 compliance if used in automotive powertrains).