The **MA207-R100-Q** is a high-precision, industrial-grade metal film resistor. It belongs to the **MA series** (often associated with manufacturers like Vishay/Beyschlag or Alpha Electronics), which is designed for applications requiring extreme stability, low noise, and tight tolerances. --- ### 1. Part Number Breakdown The nomenclature typically follows this structure: | Component Segment | Value/Description | Meaning | |:--- |:--- |:--- | | **MA207** | Series Model | Precision Metal Film Resistor (Axial Lead) | | **R100** | Resistance Value | **0.100 Ohms** (100 mΩ) | | **Q** | Tolerance | **±0.02%** (High Precision) | --- ### 2. Technical Specifications Below are the typical electrical characteristics for this class of component: | Parameter | Specification | |:--- |:--- | | **Resistance** | 0.1 Ω (100 mΩ) | | **Power Rating** | Generally 0.25W to 0.5W (depending on ambient temp) | | **Tolerance** | ±0.02% | | **Temperature Coefficient (TCR)** | Often ±5 ppm/°C or ±10 ppm/°C | | **Construction** | Metal film on high-grade ceramic core | | **Package Type** | Axial Leaded (Through-hole) | --- ### 3. Key Features * **High Stability:** The metal film technology ensures that the resistance remains constant despite aging or environmental changes. * **Low Inductance:** Ideal for high-frequency or rapid pulse applications where wire-wound resistors would cause signal distortion. * **Thermal Performance:** Designed to minimize the "Seebeck effect" (thermal EMF), which is critical when measuring very low resistances like 0.1Ω. * **Low Noise:** Metal film offers significantly lower thermal noise compared to carbon composition resistors. --- ### 4. Common Applications Due to its low resistance (0.1Ω) and high precision (0.02%), this part is primarily used in: 1. **Current Sensing:** Measuring current flow by monitoring the voltage drop across the resistor ($V = I \times R$). 2. **Instrumentation:** Used in high-end multimeters, medical equipment, and laboratory scales. 3. **Bridge Circuits:** Balancing sensitive Wheatstone bridge configurations. 4. **Feedback Loops:** In precision power supplies to maintain stable output voltages. ---