The part number **MF55-R100-DB25** refers to a high-precision metal film resistor. Below is a detailed breakdown of its electronic characteristics and specifications based on standard electronic component naming conventions (MIL-style or industry standard). --- ### 1. Part Number Deciphering The alphanumeric code provides specific details about the component's construction and performance: | Segment | Meaning | Description | | :--- | :--- | :--- | | **MF55** | Series / Body Size | Metal Film resistor, 1/4 Watt (0.25W) power rating. | | **R100** | Resistance Value | **0.100 Ohms** (The 'R' acts as a decimal point). | | **D** | Tolerance | **±0.5%** (Precision grade). | | **B** | Temp. Coefficient | **±10 ppm/°C** to **±25 ppm/°C** (indicates high stability). | | **25** | Packaging/TCR | Often refers to 25ppm Temperature Coefficient or specific lead spacing. | --- ### 2. Technical Specifications The **MF55** series is widely used in precision electronics where stability and low noise are critical. * **Type:** Metal Film (Fixed Resistor). * **Power Rating:** 0.25 Watts (1/4 W) at 70°C. * **Resistance:** 0.1 $\Omega$ (Current sensing/Shunt applications). * **Tolerance:** ±0.5% (Very high accuracy). * **Maximum Working Voltage:** Typically 200V - 250V. * **Operating Temperature Range:** -55°C to +155°C. --- ### 3. Key Features * **Low Noise:** Metal film construction offers significantly lower thermal noise compared to carbon composition resistors. * **High Stability:** Excellent resistance stability against temperature fluctuations and aging. * **Precision:** The 0.5% tolerance makes it suitable for bridge circuits and reference stages. * **Low Resistance:** At 0.1 Ohms, this is frequently used as a **Current Sense Resistor**. --- ### 4. Typical Applications Due to its low resistance and high precision, this part is commonly found in: 1. **Current Sensing:** Measuring current flow by monitoring the voltage drop across the 0.1 $\Omega$ resistance. 2. **Power Supplies:** Feedback loops and regulation. 3. **Audio Equipment:** High-fidelity signal paths where low noise is required. 4. **Instrumentation:** Precision measurement devices and calibration tools. ---