Based on the component identifier **MHO+18FDG-R**, this refers to a specific series of **Metal Oxide Film Resistors**, typically manufactured by companies like *Multi-Hole* or specific industrial electronics suppliers. Below is a detailed breakdown of the electronic specifications and characteristics of this part. ### 1. Component Overview The **MHO** series stands for Metal Oxide (High-power) resistors. These are designed to handle higher temperatures and power loads compared to standard carbon film resistors. | Feature | Specification (Typical) | | :--- | :--- | | **Type** | Metal Oxide Film Resistor | | **Power Rating** | 1/8W (0.125W) | | **Mounting Type** | Through-hole (Axial Lead) | | **Coating** | Flameproof Silicone/Ceramic | | **Resistance Range** | Usually 0.1Ω to 1MΩ (Specific to -R suffix) | --- ### 2. Part Number Breakdown (MHO+18FDG-R) The alphanumeric string follows a standard industrial coding system for passive components: * **MHO**: **Series Identifier.** Indicates a Metal Oxide Film construction. These are known for high stability and reliability under overload conditions. * **18**: **Power Rating.** Corresponds to **1/8 Watt**. This indicates the maximum continuous power the resistor can dissipate at room temperature. * **F**: **Tolerance.** "F" typically represents **±1%** precision. * **DG**: **Packaging/Forming Code.** Often refers to "Dipped" coating or a specific lead forming style (e.g., Taped in Box or G-form leads). * **-R**: **RoHS Compliance.** Indicates that the part is lead-free and meets environmental safety standards. --- ### 3. Key Electronic Characteristics #### A. Temperature Performance Metal oxide resistors have an excellent **Temperature Coefficient of Resistance (TCR)**, usually ranging between **±200ppm/°C to ±350ppm/°C**. They remain stable even as the component heats up. #### B. Flameproof Properties Unlike carbon resistors which may catch fire during a catastrophic failure, the MHO series uses a **flameproof coating**. If the power exceeds the 1/8W rating significantly, the resistor will open (act like a fuse) without emitting flames or excessive smoke. #### C. Electrical Noise They provide much lower thermal noise compared to carbon composition resistors, making them suitable for audio processing or sensitive signal paths. --- ### 4. Comparison Table: Metal Oxide vs. Other Types | Property | Metal Oxide (MHO) | Carbon Film | Metal Film | | :--- | :--- | :--- | :--- | | **Tolerance** | Good (±1% to ±5%) | Poor (±5%) | Excellent (±0.1% to ±1%) | | **Heat Resistance**| High | Moderate | Moderate | | **Noise Level** | Low | High | Very Low | | **Surge Handling** | Excellent | Moderate | Poor | --- ### 5. Common Applications * **Power Supplies:** Used as bleeder resistors or in voltage dividers. * **Automotive Electronics:** Due to high-temperature stability. * **Industrial Control:** Where reliability in harsh environments is required. * **Consumer Electronics:** General purpose current limiting where flameproofing is a safety requirement.