The **PCMB104T-R22MS** is a high-performance, surface-mount (SMD) power inductor commonly used in DC-to-DC converters and voltage regulator modules (VRMs). It is manufactured by Susumu (or equivalent brands like Cyntec/Delta) and belongs to the molded power choke family. --- ## 1. Part Number Breakdown Understanding the alphanumeric code helps identify its physical and electrical characteristics: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **PCMB** | Series Name | Metal Composite Molded Inductor | | **104T** | Size Code | Approx. 11.5mm x 10.0mm x 4.0mm | | **R22** | Inductance Value | 0.22 microhenries (µH) | | **M** | Tolerance | ±20% | | **S** | Special Feature | Specific internal construction or material | --- ## 2. Technical Specifications The "R22" indicates a very low inductance, which is designed for high-frequency switching and high current output. ### Electrical Characteristics * **Inductance:** 0.22 µH * **DC Resistance (DCR):** Extremely low (typically < 1.0 mΩ), which minimizes power loss and heat. * **Saturation Current ($I_{sat}$):** High (typically > 40A). This is the current at which inductance drops by a specific percentage. * **Rated Current ($I_{rms}$):** High (typically > 30A). The current that causes a specific temperature rise (usually 40°C). ### Physical Characteristics * **Material:** Carbonyl iron powder core (Molded construction). * **Shielding:** Shielded construction (Low EMI interference). * **Operating Temperature:** Generally ranges from -55°C to +125°C. --- ## 3. Key Features & Benefits 1. **High Power Density:** Because it uses a molded metal powder core, it can handle much higher currents than traditional ferrite inductors of the same size. 2. **Soft Saturation:** Unlike ferrite inductors that "crash" (lose inductance suddenly) when overloaded, this part has a gradual saturation curve. 3. **Low Buzz Noise:** The molded structure encapsulates the coil, significantly reducing acoustic noise caused by magnetostriction. 4. **Excellent Temperature Stability:** Inductance remains relatively stable across a wide temperature range. --- ## 4. Common Applications Due to its high current handling and low profile, the PCMB104T-R22MS is found in: * **Motherboards & Servers:** CPU/GPU core power supplies (VRMs). * **Graphic Cards:** High-end GPUs requiring high-current DC-DC conversion. * **Laptops:** Compact power circuits for processors. * **Network Equipment:** High-speed routers and switches. ---