The **VCMT104T-R19MN5** is a high-performance **Power Inductor** manufactured by Cyntec. It belongs to the VCMT series, which is specifically designed for high-current power supply applications, typically found in computing, telecommunications, and automotive electronics. ### 1. Key Technical Specifications | Parameter | Value | Description | | :--- | :--- | :--- | | **Inductance** | 0.19 µH | The nominal inductance at 100kHz. | | **Tolerance** | ±20% (M) | The allowable variance in inductance value. | | **DCR (DC Resistance)** | ~0.80 mΩ (Typ) | The resistance of the wire, critical for efficiency. | | **Isat (Saturation Current)** | ~60A - 70A | Current at which inductance drops by a specific %. | | **Irms (Rated Current)** | ~40A - 50A | Current that causes a specific temperature rise (usually 40°C). | | **Size Code** | 104T | Dimensions: ~11.5 x 10.3 x 4.0 mm. | --- ### 2. Physical Construction and Materials The "VCMT" series utilizes a **Metal Molded** construction: * **Core Material:** Carbonyl Iron powder or similar metal alloy powder. This provides high saturation characteristics compared to traditional ferrite cores. * **Shielding:** The molded design inherently provides magnetic shielding, reducing Electromagnetic Interference (EMI). * **Lead Frame:** Features a robust lead-frame construction for high vibration resistance and excellent heat dissipation. ### 3. Part Number Breakdown | Segment | Meaning | | :--- | :--- | | **VCMT** | Series name (Molded Power Inductor). | | **104T** | Case size (Approx. 10mm x 10mm footprint, 4mm height). | | **R19** | Inductance value (R19 = 0.19 microhenries). | | **M** | Tolerance (M = ±20%). | | **N5** | Internal manufacturing/revision code. | --- ### 4. Typical Applications Due to its very low inductance and extremely high current handling, this part is used in: * **Voltage Regulator Modules (VRM):** Specifically for CPUs and GPUs where high-speed switching and high current are required. * **DC/DC Converters:** Point-of-load (POL) converters in servers and workstations. * **High-density Power Supplies:** Where space is limited but power output is high. --- ### 5. Advantages & Limitations * **Pros:** * Extremely low DCR minimizes power loss (heat). * Soft saturation curve (doesn't drop inductance abruptly). * Low acoustic noise compared to standard ferrite inductors. * **Cons:** * Higher cost than standard wire-wound inductors. * Higher core losses at very high frequencies compared to some ferrite materials.