The **MA207HS-R100-Q** is a high-precision, high-stability metal film resistor. It belongs to a specialized class of resistors often used in instrumentation, medical electronics, and aerospace applications where accuracy and low thermal drift are critical. ### 1. Part Number Breakdown While nomenclature can vary slightly by manufacturer (such as Viking Tech or Susumu), the code generally breaks down as follows: | Segment | Meaning | Specification | | :--- | :--- | :--- | | **MA207** | Series/Size | Precision Metal Film (often MELF or Axial) | | **HS** | Type/Feature | High Stability / High Reliability | | **R100** | Resistance Value | 0.1 $\Omega$ (100 m$\Omega$) | | **Q** | Tolerance | $\pm$0.02% (Extremely High Precision) | --- ### 2. Key Technical Specifications These components are engineered to maintain a consistent resistance value even under fluctuating environmental conditions. * **Resistance:** 0.1 Ohms ($100 \text{ m}\Omega$). * **Tolerance:** $\pm$0.02%. This is a "Precision" grade part; standard consumer resistors are usually $\pm$1% or $\pm$5%. * **Temperature Coefficient (TCR):** Usually very low (e.g., $\pm$5 ppm/°C to $\pm$15 ppm/°C), meaning the resistance changes minimally as the temperature rises. * **Construction:** Metal film deposited on a ceramic substrate, often with a protective coating to prevent oxidation. --- ### 3. Applications and Usage Due to its low resistance value ($0.1 \Omega$) and high precision, this part is typically used for: 1. **Current Sensing:** Used as a shunt resistor to measure current flow by measuring the voltage drop across it ($V = I \times R$). 2. **Bridge Circuits:** Employed in Wheatstone bridges for sensitive sensor measurements. 3. **Medical Equipment:** Used in diagnostic devices where signal integrity is paramount. 4. **Calibration Standards:** Acting as a reference point for test and measurement equipment. --- ### 4. Comparison with Standard Resistors | Feature | Standard Resistor | MA207HS-R100-Q | | :--- | :--- | :--- | | **Accuracy** | Low (5%) | Ultra-High (0.02%) | | **Thermal Drift** | High (100+ ppm) | Very Low (<15 ppm) | | **Cost** | Negligible | Premium / Expensive | | **Noise** | Higher Thermal Noise | Low Noise Construction | ---