The **CTIHLP73F-R15M** is a high-current, low-profile power inductor typically used in DC-DC converter applications. It belongs to a category of surface-mount (SMD) power inductors designed for high efficiency and high power density. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify its key physical and electrical characteristics: | Code | Meaning | Details | | :--- | :--- | :--- | | **CTIHLP** | Series Category | High-current, low-profile molded power inductor. | | **73** | Case Size | Refers to the footprint (approx. 7.3mm x 6.6mm). | | **F** | Designator | Specific material or version variant. | | **R15** | Inductance Value | **0.15 µH** (R denotes the decimal point). | | **M** | Tolerance | **±20%** tolerance on the inductance value. | --- ### 2. Key Electrical Specifications While specific values may vary slightly by manufacturer (such as Central Technologies), typical specs for this part include: * **Inductance:** 0.15 µH * **DC Resistance (DCR):** Extremely low, typically in the range of **0.5mΩ to 1.2mΩ**. This minimizes power loss due to heat. * **Saturation Current ($I_{sat}$):** Very high, often exceeding **40A to 50A**. This is the current at which inductance drops by a specific percentage (usually 20-30%). * **RMS Current ($I_{rms}$):** The continuous current the inductor can handle based on a temperature rise (usually 40°C). * **Operating Temperature:** Generally rated from **-55°C to +125°C**. --- ### 3. Construction and Material The "HLP" series typically utilizes a **Molded Powder Core** construction: 1. **Composite Core:** Made of iron powder pressed around the copper winding. 2. **Shielded Design:** The molded construction provides inherent magnetic shielding, reducing Electromagnetic Interference (EMI). 3. **Low Buzz Noise:** The solid molded structure minimizes acoustic noise caused by magnetostriction. --- ### 4. Common Applications Due to its low inductance and high current capability, the CTIHLP73F-R15M is ideal for: * **Voltage Regulator Modules (VRMs):** Found in high-end motherboards and servers. * **GPU/CPU Power Supplies:** Where high-speed switching and high current are required. * **Point of Load (POL) Converters:** Distributed power architectures in telecommunications. * **Battery Powered Systems:** Where high efficiency is critical to extending battery life. --- ### 5. Summary Table | Feature | Attribute | | :--- | :--- | | **Mounting Type** | Surface Mount (SMD/SMT) | | **Shielding** | Shielded (Molded) | | **Core Material** | Carbonyl Iron / Metal Powder | | **Inductance** | 150 nH (0.15 µH) | | **Footprint** | ~7.3 x 6.6 mm |