The **CVR1-3A-R/CE** is a specific type of electronic component known as a **Trimmer Potentiometer** (or Variable Resistor). It is primarily used for fine-tuning circuits during manufacturing or calibration. --- ## 1. Component Identification This part belongs to a class of surface-mount devices (SMD) designed for space-constrained PCB applications. | Feature | Specification | | :--- | :--- | | **Component Type** | Chip Trimmer Potentiometer | | **Mounting Type** | Surface Mount (SMD/SMT) | | **Adjustment Slot** | Cross-shaped (Phillips) for automated adjustment | | **Terminal Finish** | Lead-free (RoHS Compliant) | | **Resistance Range** | Typically available from 100Ω to 1MΩ | --- ## 2. Technical Characteristics Understanding the "3A" and "R/CE" suffixes is crucial for matching the part to its datasheet: ### Physical Structure * **Open Frame Design:** Unlike sealed potentiometers, this is an "open" type, meaning the internal resistive element is visible. This makes it cost-effective but sensitive to dust and moisture. * **Size:** Generally follows a standard footprint (often 3mm x 3mm), allowing for high-density board placement. ### Electrical Performance * **Tolerance:** Usually ±25%. * **Power Rating:** Low power, typically around 0.1W at 70°C. * **Rotation Angle:** Mechanical rotation is usually around 240° to 270°. --- ## 3. Part Number Breakdown (Typical for CVR series) While nomenclature varies slightly by manufacturer (like Kyocera or Hokuriku), it generally follows this logic: 1. **CVR:** Chip Variable Resistor. 2. **1:** Size code (indicates specific dimensions). 3. **3A:** Refers to the style of the adjustment head and terminal layout. 4. **R:** Tape and Reel packaging. 5. **CE:** Standard series identifier for specific electrical/environmental tolerances. --- ## 4. Common Applications Since these parts are designed for infrequent adjustments, they are found in: * **LCD Contrast Control:** Adjusting the clarity of small screens. * **Sensor Calibration:** Zeroing out a sensor signal. * **Audio Equipment:** Setting gain levels or volume limits within a circuit. * **Power Supplies:** Fine-tuning output voltage levels.