The **CTEP105LF-R36N** is a high-current, surface-mount (SMD) power inductor manufactured by **Sumida**. It belongs to the CTEP105 series, which is known for its low profile and high reliability in DC-DC converter applications. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify the component's specific characteristics: | Code Segment | Meaning | Specification | | :--- | :--- | :--- | | **CTEP105** | Series Name | Low profile high current inductor | | **LF** | Lead-Free | RoHS compliant | | **R36** | Inductance Value | 0.36 µH | | **N** | Tolerance | ±30% | --- ### 2. Key Technical Specifications The following table highlights the typical electrical and physical parameters of the R36N variant: | Parameter | Value | | :--- | :--- | | **Inductance** | 0.36 µH | | **Tolerance** | ±30% | | **DC Resistance (DCR)** | ~1.7 mΩ (Max) | | **Saturation Current ($I_{sat}$)** | ~25.0 A | | **Temperature Rise Current ($I_{rms}$)** | ~18.0 A | | **Operating Temperature** | -40°C to +100°C | | **Dimensions (LxWxH)** | Approx. 10.4 x 10.4 x 5.6 mm | --- ### 3. Structural Features * **Core Material:** Typically utilizes a Manganese-Zinc (Mn-Zn) ferrite core, which provides high efficiency at high frequencies. * **Shielding:** It is a **magnetically shielded** construction. This minimizes Electromagnetic Interference (EMI) with surrounding components on the PCB. * **Terminals:** Features flat-lead terminals for robust mechanical mounting and low contact resistance. --- ### 4. Common Applications Due to its high current handling and low DCR, this part is commonly found in: 1. **Voltage Regulator Modules (VRMs):** Used in CPUs and GPUs. 2. **DC-DC Converters:** Buck/Boost converters for telecommunications and industrial equipment. 3. **Laptop/Server Motherboards:** Providing stable power delivery to high-drain circuits. 4. **Battery Powered Devices:** Where high efficiency is required to extend battery life. --- ### 5. Design Considerations * **Thermal Management:** While the $I_{rms}$ is high, ensure the PCB layout has adequate copper pouring to dissipate heat generated by the DCR. * **Saturation:** Always check that your peak circuit current does not exceed the $I_{sat}$ rating, as the inductance will drop sharply, potentially causing circuit failure or noise.