The **MHO+35FBD-R** is a specific series code typically associated with **MHO (Metal House/Housing) Power Resistors**, often manufactured by companies like *Ohmite* or *TE Connectivity* under specific high-power resistor lines. Below is a breakdown of the electronic characteristics and specifications typical of this part family. --- ### 1. General Specifications These components are high-power, metal-housed resistors designed for chassis mounting to facilitate heat dissipation. | Feature | Description | | :--- | :--- | | **Component Type** | Metal Housed / Wirewound Power Resistor | | **Series** | MHO Series | | **Mounting Style** | Chassis Mount (Bolted to a heat sink) | | **Termination** | Radial / Flexible Leads (indicated by "FBD") | | **Tolerance** | Usually ±1% or ±5% (Standard Precision) | --- ### 2. Part Number Breakdown (Typical) While naming conventions can vary slightly by manufacturer, the code usually follows this logic: * **MHO:** Metal House series (Aluminum housed for high heat dissipation). * **35:** Often refers to the **Power Rating** (e.g., 35 Watts when mounted on a proper heat sink). * **FBD:** Refers to the **Terminal Type** (Fast-on/Flexible leads or specific Bushing Dimensions). * **R:** Indicates the resistance value (if followed by numbers) or "RoHS Compliant" status. --- ### 3. Key Electronic Characteristics #### A. Thermal Management The primary feature of the MHO series is its **Aluminum Housing**. Because wirewound resistors generate significant heat, the metal casing acts as a conduit to transfer heat to an external metal plate or chassis. * **Derating:** The 35W rating is only achievable if the unit is mounted to a specific size heat sink. Without a heat sink, the power capacity drops significantly (often to 25-40% of rated power). #### B. Construction * **Resistive Element:** High-stability wirewound element. * **Insulation:** High-temperature molding compound or silicone-based filling to protect the internal wire from moisture and vibration. * **Inductance:** Being wirewound, these components have inherent inductance. They are generally not used for high-frequency switching unless specified as "Non-Inductive" (Ayrton-Perry winding). --- ### 4. Common Applications Due to their durability and high power-to-size ratio, these parts are found in: 1. **Motor Control:** Current sensing and braking resistors. 2. **Power Supplies:** Load testing and voltage dropping. 3. **Automotive:** LED load resistors (to prevent hyper-flashing) and heater circuits. 4. **Industrial:** Dynamic braking for small motors. --- ### 5. Installation Note > **Caution:** When installing the MHO+35FBD-R, it is highly recommended to use **Thermal Grease** (Heat Sink Compound) between the bottom of the resistor and the mounting surface to ensure maximum heat transfer efficiency.