The **CVR1-HA-R** is a specific electronic component belonging to the family of **Surface Mount (SMT) Trimmer Potentiometers** (variable resistors). These are used for fine-tuning circuit parameters like voltage levels, gain, or timing during the manufacturing process. --- ### 1. Key Technical Specifications The part number follows a specific nomenclature used by manufacturers (commonly associated with brands like **Copal Electronics** or **Kyocera**). Below are the typical specifications for this series: | Parameter | Specification | | :--- | :--- | | **Component Type** | Cermet Trimmer Potentiometer | | **Mounting Type** | Surface Mount (SMD) | | **Size/Package** | 3mm (Ultra-miniature) | | **Adjustment Slot** | Single-turn, Cross-slot | | **Resistive Material** | Cermet (Ceramic/Metal composite) | | **Termination Style** | J-Hook or Gull-wing (R-suffix denotes packaging style) | | **Power Rating** | ~0.1W to 0.15W at 70°C | --- ### 2. Physical Characteristics * **Dimensions:** Its small footprint (typically $3.2 \times 3.0 \times 1.5$ mm) makes it ideal for high-density PCBs. * **Construction:** The "Cermet" element ensures high stability and low noise compared to carbon-based potentiometers. * **Sealing:** These parts are usually open-frame (non-sealed) to reduce costs, though they are designed to withstand standard reflow soldering temperatures. --- ### 3. Part Number Breakdown While manufacturer codes vary slightly, the "CVR1-HA-R" generally breaks down as follows: * **CVR:** Product series prefix (Chip Variable Resistor). * **1:** Size code (often denotes the 3mm series). * **HA:** Specific height/terminal configuration (Top-adjust). * **R:** Taping/Packaging code (Tape & Reel for automated pick-and-place). --- ### 4. Typical Applications The CVR1-HA-R is used in circuits where manual calibration is required once before shipping the product: 1. **LCD Contrast Adjustment:** Setting the bias voltage for small displays. 2. **Sensor Calibration:** Zeroing out the offset in analog sensor modules. 3. **Communication Devices:** Tuning frequency or gain in RF circuits. 4. **Power Supplies:** Fine-tuning output voltage limits. --- ### 5. Schematic Symbol In a circuit diagram, it is represented as a three-terminal resistor with an arrow: ```text (Terminal 1) ---[ Resistor ]--- (Terminal 3) ^ | (Terminal 2 - Wiper) ```