The part number **47LAC-202B-R** refers to a high-precision **trimmer potentiometer** (variable resistor), typically manufactured by companies like Copal Electronics (Nidec). These components are designed for fine-tuning resistance levels within a circuit. --- ### 1. Component Specifications The alphanumeric code provides specific details about the component's electrical and physical properties: | Parameter | Specification | Details | | :--- | :--- | :--- | | **Series** | 47LAC | Multi-turn cermet trimmer series | | **Resistance Value** | 202 (2.0 kΩ) | "20" followed by "2" zeros (2000 Ohms) | | **Tolerance** | B (±10%) | Standard precision tolerance | | **Packaging** | -R | RoHS Compliant / Tape & Reel (typically) | | **Adjustment Type** | Top/Side Actuated | Depends on specific housing orientation | --- ### 2. Key Features * **Multi-turn Adjustment:** Unlike standard single-turn potentiometers, this part requires multiple rotations (often 12 to 20 turns) to move the wiper from 0 to the maximum resistance. This allows for extremely high resolution and precise calibration. * **Cermet Element:** The resistive material is made of "Ceramic-Metal" (Cermet), which offers excellent stability, low noise, and a long life span compared to carbon-based elements. * **Sealed Construction:** Most units in this series are sealed to withstand industrial cleaning processes (wave soldering/washing) and to prevent environmental contamination. --- ### 3. Pinout and Circuit Representation The component typically features three terminals. Below is a simplified representation of its function: ```text Terminal 1 (CW) ----\ \ Terminal 2 (Wiper) ---[====] (Internal Resistive Track) / Terminal 3 (CCW) ----/ ``` ### 4. Common Applications * **Voltage Regulation:** Fine-tuning the output voltage of a DC-DC converter or power supply. * **Sensor Calibration:** Zeroing out offsets in operational amplifiers or bridge sensors. * **Timing Circuits:** Adjusting the RC time constant in precision oscillators. * **LCD Contrast:** Setting the bias voltage for industrial display modules. ---