The **3314-R** refers to a specific series of **surface-mount (SMD) cermet trimming potentiometers** (trimmers) manufactured primarily by **Bourns**. These components are widely used in electronic circuits to adjust resistance for calibration and tuning purposes. --- ### 1. Key Technical Specifications The "3314" designates the physical series, while the "R" typically refers to the **terminal style** or **packaging type** (often indicating a specific lead orientation for surface mounting). | Feature | Specification | | :--- | :--- | | **Element Type** | Cermet (Ceramic/Metal composite) | | **Size** | 4 mm Square | | **Power Rating** | 0.25 Watts at 70°C | | **Resistance Range** | 10 Ohms to 2 Megohms | | **Tolerance** | ±20% (Standard) | | **Temperature Coefficient** | ±100 ppm/°C | | **Rotation Angle** | 210° (Mechanical) | --- ### 2. Physical Characteristics The 3314-R series is designed for automated assembly processes. Its small footprint makes it ideal for high-density circuit boards. * **Construction:** The cermet element provides high stability and low noise compared to carbon-based trimmers. * **Sealing:** Most models are **sealed** to withstand board washing processes and harsh environments (IP67 rated). * **Adjustment:** Top-adjust or side-adjust slots are available, designed for use with a miniature screwdriver. --- ### 3. Application Use Cases These parts are used wherever precise voltage or current adjustment is required after the circuit is manufactured. 1. **Calibration:** Adjusting the gain of an operational amplifier. 2. **Sensors:** Fine-tuning the threshold of a sensor circuit. 3. **Power Supplies:** Setting the exact output voltage of a DC-DC converter. 4. **LCD Contrast:** Controlling the brightness or contrast levels of small display modules. --- ### 4. Part Numbering Example When ordering a 3314-R part, the full suffix determines the resistance and packaging: ```text 3314J-1-502E | | | | | | | | | +-- Packaging (E = Embossed Tape) | | | +----- Resistance Code (502 = 5,000 Ohms) | | +-------- Standard Product Indicator | +---------- Terminal Style (J, G, R, etc.) +-------------- Model Series (4mm Square) ```