The **T225G-R100-KB** refers to a specific series of high-precision, wirewound potentiometers (frequently associated with brands like Tokyo Cosmos Electric - TOCOS). These components are primarily used for precise resistance adjustment in industrial and laboratory equipment. --- ## 1. Technical Specifications Below is a breakdown of the typical electronic characteristics for this part number: | Parameter | Specification | | :--- | :--- | | **Component Type** | Multi-turn Wirewound Potentiometer | | **Resistance Value** | 100 $\Omega$ (indicated by "R100") | | **Resistance Tolerance** | ±5% (Standard) | | **Power Rating** | 2.0 Watts (at 40°C) | | **Rotational Life** | ~1,000,000 cycles | | **Number of Turns** | 10 Turns | | **Temperature Coefficient** | ±20 ppm/°C | --- ## 2. Part Number Breakdown Understanding the nomenclature helps in identifying its specific physical and electrical build: * **T225G**: The series designation. "22" usually indicates a 22mm diameter body. The "G" often signifies a specific bushing or shaft style (usually a metal threaded bushing). * **R100**: The resistance value. "R" acts as the decimal or multiplier; in this context, it represents **100 Ohms**. * **KB**: This suffix typically denotes the **Linearity Tolerance** (B = ±0.25% or similar) and the **Taper Type** (Linear). --- ## 3. Key Electronic Features ### Wirewound Element Unlike carbon film potentiometers, this device uses a resistive wire (often Nichrome) wound around an insulated core. * **Pro:** Excellent power handling and thermal stability. * **Con:** Higher inductance, making it less suitable for high-frequency RF applications. ### 10-Turn Precision The internal mechanism requires 10 full 360° rotations to move the wiper from 0$\Omega$ to 100$\Omega$. This provides extremely high resolution, allowing a user to set a resistance value with minute accuracy (e.g., increments of 0.1$\Omega$). ### Mechanical Construction * **Housing:** Usually glass-filled nylon or aluminum. * **Terminals:** Gold-plated or tin-plated brass terminals for reliable soldering. * **Shaft:** Stainless steel or nickel-plated brass to prevent corrosion. --- ## 4. Typical Applications Because of its durability and precision, the T225G-R100-KB is commonly found in: 1. **Medical Equipment:** Adjusting sensitive sensor calibrations. 2. **Industrial Controls:** Setting motor speeds or voltage thresholds in power supplies. 3. **Test & Measurement:** Used in bridge circuits or as a variable load in laboratories. 4. **Avionics:** Cockpit instrumentation adjustments. ---