The **PM7232S-R72M-RC** is a high-current, shielded surface-mount (SMD) power inductor manufactured by Bourns. These components are primarily used for DC-DC converter applications where high efficiency and low electromagnetic interference (EMI) are required. --- ### 1. Technical Specifications | Parameter | Value | Notes | | :--- | :--- | :--- | | **Inductance** | 0.72 µH | Measured at 100 kHz / 0.1 V | | **Tolerance** | ±20% | Standard for power inductors | | **Rated Current (Irms)** | 10.5 A | Current causing 40°C temperature rise | | **Saturation Current (Isat)** | 22 A | Current causing 30% drop in inductance | | **DC Resistance (DCR)** | 7.0 mΩ Max | Low resistance for high efficiency | | **Operating Temp** | -55°C to +125°C | Includes self-heating | | **Shielding** | Shielded | Carbonyl powder core for low EMI | --- ### 2. Breakdown of the Part Number Understanding the nomenclature helps identify the physical and electrical characteristics: * **PM7232S**: The series designation. "7232" typically refers to the physical footprint (approx. 7.2mm x 7.2mm). * **R72**: Represents the inductance value. "R" acts as a decimal point, so R72 = **0.72 µH**. * **M**: Represents the tolerance code (**±20%**). * **RC**: Indicates **RoHS Compliant**. --- ### 3. Key Features & Construction 1. **Shielded Construction**: The inductor is encapsulated in a magnetic metal powder core. This design minimizes "stray" magnetic fields, preventing interference with nearby sensitive components on the PCB. 2. **High Saturation Current**: Unlike ferrite cores that saturate "hard" (sudden drop in inductance), the carbonyl powder core used here provides a "soft" saturation curve, making the circuit more stable under peak loads. 3. **Low DCR**: The use of flat-wire or heavy-gauge copper winding inside reduces power loss due to heat (I²R losses), which is critical for battery-powered devices. --- ### 4. Common Applications * **Voltage Regulator Modules (VRMs)**: Used in CPUs and GPUs for power delivery. * **DC/DC Converters**: Found in telecommunications equipment and industrial power supplies. * **Battery Powered Devices**: Where high efficiency is needed to extend battery life. * **Automotive Electronics**: Used in infotainment and driver assistance systems (though usually, "A" prefixed parts are used for AEC-Q200 grade). ---