The **MHO+15FBG-R** is a specific part number typically associated with **MHO (Metal House-Resistor)** power resistors, often manufactured by companies like **Futaba** or specialized power resistor brands. It is a high-power, flameproof metal oxide film resistor housed in a rectangular ceramic or metal case. --- ### 1. Part Number Breakdown While naming conventions can vary slightly by manufacturer, here is the standard breakdown for this series: | Segment | Meaning | Description | | :--- | :--- | :--- | | **MHO** | Series Name | Metal House/Oxide high-power series. | | **15** | Power Rating | Indicates a **15 Watt** power dissipation capacity. | | **F** | Tolerance | Indicates **±1%** precision (standard for high-end power resistors). | | **B** | Packaging/Form | Often refers to "Bulk" or a specific Lead/Case shape. | | **G** | Resistance Code | Part of the value multiplier (often indicates Giga-ohms or a specific range). | | **R** | Unit | Ohms ($\Omega$). | --- ### 2. Technical Specifications These resistors are designed for industrial applications where heat dissipation and stability are critical. * **Rated Power:** 15 Watts (at $70^\circ C$). * **Dielectric Strength:** High (usually $1000V+$) due to the ceramic housing. * **Core Material:** Metal Oxide Film or Wirewound (depending on the exact resistance value). * **Coating:** Flameproof silicone or ceramic encapsulation. * **Operating Temperature:** $-55^\circ C$ to $+200^\circ C$. --- ### 3. Key Features * **Excellent Heat Dissipation:** The rectangular "House" style casing allows for better surface area contact and airflow. * **Flameproof Construction:** The materials used ensure that the resistor will not catch fire even under extreme overload conditions (it will open like a fuse instead). * **High Stability:** Metal oxide film provides better long-term stability than standard carbon film resistors. * **Low Inductance:** Typically designed to minimize inductive effects, making them suitable for high-frequency switching power supplies. --- ### 4. Common Applications Due to the 15W power rating, these parts are used in "heavy-duty" electronic circuits: 1. **Inrush Current Limiters:** Protecting circuits from the initial surge when power is turned on. 2. **Snubber Circuits:** Used in motor controllers to absorb voltage spikes. 3. **Power Supplies:** Used as a bleeder resistor or load resistor. 4. **Audio Amplifiers:** High-power output stages where precision and heat management are required.