3314G-1-503E

The 3314G-1-503E is a high-quality single-turn trimming potentiometer from Bourns’ Trimpot 3314 series, designed for precision circuit adjustment applications in surface-mount electronic assemblies. With a resistance value of 50kOhms and a compact 4.5mm x 4.5mm square footprint, this device combines space-saving design with reliable performance. The ‘G’ style features gull-wing terminations that provide robust solder joints and excellent mechanical stability on the PCB, while the top-adjust configuration allows easy access for calibration and adjustment after assembly. The cermet resistive element, composed of a ceramic-metal composite, offers superior stability, wear resistance, and temperature performance compared to carbon-based alternatives. With a temperature coefficient of ±100 ppm/°C and a wide operating temperature range of -55°C to +125°C, the 3314G-1-503E maintains consistent resistance values across extreme environmental conditions. The sealed construction with O-ring protection prevents moisture ingress and contamination, ensuring long-term reliability in harsh environments. This device is AEC-Q200 qualified (Grade 1), making it suitable for automotive applications where reliability and durability under demanding conditions are essential. The 0.25W power rating and 210-degree adjustment angle provide a good balance between power handling and adjustment range for most trimming applications. The 3314G-1-503E is compatible with standard surface-mount manufacturing processes including vacuum pick-and-place equipment and reflow soldering. It is supplied in tape and reel packaging with 500 pieces per 7-inch reel, suitable for automated assembly. With its MSL-1 moisture sensitivity level, the device has unlimited shelf life without requiring dry storage. The 3314 series trimmers are widely used in consumer electronics, automotive systems, industrial controls, telecommunications equipment, power supplies, and medical devices for circuit calibration, gain adjustment, voltage trimming, and sensor signal conditioning applications.

A potentiometer is a three-terminal variable resistor where the third terminal (wiper) makes electrical contact with the resistive element at an adjustable position, creating a variable voltage divider. The 3314G-1-503E uses a cermet resistive element, which is a composite material made of ceramic and metal particles sintered onto a ceramic substrate. Cermet provides excellent stability, low noise, and resistance to wear compared to other resistive materials. The wiper, typically made of a precious metal alloy, makes contact with the cermet element and moves along its surface as the adjustment screw is turned. In the 3314 series, the wiper is driven by a direct-drive mechanism where a slotted rotor turns to move the wiper contact along the circular resistive element path. The adjustment angle is 210 degrees, which is less than a full 360-degree turn, providing electrical stops at both ends of the travel. When a voltage is applied across the two end terminals of the potentiometer, the wiper terminal outputs a voltage proportional to its position along the resistive element. This makes potentiometers useful for voltage division, signal level adjustment, biasing, and calibration purposes. The contact resistance variation (CRV) specification of 3% or 3Ω maximum indicates the amount of resistance variation that occurs as the wiper moves across the element due to the contact interface. The infinite resolution specification means there is theoretically no minimum step size in the resistance adjustment – it is continuously variable throughout its range. The sealed construction with O-ring seal protects the internal resistive element and wiper from environmental contaminants, moisture, and soldering flux residues during manufacturing.

• Power supply output voltage adjustment and current limit trimming
• Audio equipment gain control and bias adjustment
• Sensor calibration and signal conditioning circuits
• Automotive electronics (AEC-Q200 qualified) – sensor trimming, control unit calibration
• Telecommunication equipment circuit calibration
• Industrial control and instrumentation circuits
• Medical device calibration and precision adjustment
• Display and backlighting brightness adjustment
• RF circuit impedance matching and tuning