SPIDER Automation | 20KΩ 500mW Cermet Trimming Potentiometer | Single-Turn Through-Hole PCB Trimpot
The 20KΩ Cermet Trimming Potentiometer is a compact adjustable resistor designed for setting and calibrating resistance values in electronic circuits. With a 500mW (0.5W) power rating and 10% resistance tolerance, it provides an adjustable resistance element for voltage-divider networks, signal conditioning, circuit calibration and electronic control applications. Its cermet resistive composition and sealed construction make it suitable for integration into PCB-based electronic assemblies.
The component incorporates a three-terminal through-hole configuration and a top-slot adjustment mechanism, allowing resistance adjustment through the accessible top surface during circuit configuration. Its specified operating temperature range of −55°C to +125°C and temperature coefficient of 100ppm/°C make it suitable for electronic designs requiring an adjustable resistance element across a broad range of operating temperatures. The package contains two 20kΩ trimmer potentiometers.
Product Overview & Functional Design
A trimming potentiometer, commonly called a trimpot, is an adjustable resistor used to establish or fine-tune electrical parameters within an electronic circuit. Unlike a conventional user-operated rotary potentiometer, a trimmer is generally adjusted during circuit assembly, commissioning, calibration or maintenance.
This model uses a cermet resistive element with a nominal resistance of 20kΩ. Its three terminals provide the electrical connections required for variable-resistance or potentiometric circuit configurations. The top-slot adjustment arrangement enables access to the adjustment mechanism after PCB installation, subject to the surrounding component layout and enclosure clearance.
Technical Features & Functional Characteristics
- Adjustable Resistance: Provides a nominal resistance of 20kΩ for setting circuit operating parameters and calibration values.
- Cermet Composition: Uses a ceramic-metal resistive material commonly employed in precision adjustment components.
- Power Dissipation: Features a rated power of 500mW (0.5W) for suitable low-power electronic circuit applications.
- Resistance Tolerance: The nominal resistance tolerance is 10%, defining the permitted initial resistance variation around the 20kΩ nominal value.
- Three-Terminal Configuration: Supports adjustable voltage-divider or variable-resistance arrangements according to the circuit connection.
- Top-Slot Access: Allows adjustment from the top of the component using a compatible adjustment tool.
- Sealed Construction: Incorporates an enclosed construction suitable for PCB-based electronic assemblies.
- Temperature Coefficient: The specified 100ppm/°C coefficient characterises resistance variation in response to temperature changes.
- Wide Operating Temperature Range: Supports operation across the specified −55°C to +125°C temperature range.
- Adjustment Cycle Rating: Provides a rotational life rating of 200 cycles for setup and periodic adjustment operations.
- Through-Hole Mounting: Uses three PCB terminals for installation in compatible through-hole circuit-board footprints.
Electrical Configuration & Circuit Integration
The three terminals provide the connections for the resistive element and its adjustable contact. Depending on the circuit design, the component can be connected as a variable voltage divider or as an adjustable two-terminal resistance. The selected connection determines how the trimmer influences the circuit’s electrical behaviour.
- Voltage-Divider Configuration: Connect the two end terminals across the intended reference or signal voltage, and use the adjustable terminal to obtain a variable output voltage.
- Variable-Resistance Configuration: Use the adjustable terminal together with one end terminal to obtain an adjustable resistance in the circuit.
- PCB Integration: Install the three terminals into matching through-hole PCB positions, ensuring the component orientation and terminal arrangement match the circuit layout.
- Calibration Access: Position the component so the top adjustment slot remains accessible when calibration is required after assembly.
Applications
The 20KΩ cermet trimmer potentiometer is suitable for electronic circuits where a manually adjustable resistance is required during configuration, calibration or maintenance.
- Voltage-Divider Circuits: Adjusts voltage levels in resistor-divider networks and reference-setting circuits.
- Sensor Signal Conditioning: Provides resistance adjustment for compatible sensor interface and signal-conditioning circuits.
- Analog Circuit Calibration: Supports adjustment of resistance-dependent parameters in analog electronic designs.
- Amplifier Bias Adjustment: Can be incorporated into suitable amplifier circuits for setting adjustable bias parameters.
- Reference Voltage Adjustment: Provides an adjustable resistance element in compatible reference-voltage networks.
- Threshold Setting Circuits: Supports adjustment of resistance-dependent switching thresholds in electronic control circuits.
- Embedded Control Boards: Integrates into microcontroller-based PCB assemblies where manual analog parameter adjustment is required.
- Instrumentation Electronics: Provides a trimming element for compatible measurement and signal-processing circuits.
- Power Supply Calibration: Can be used in suitable adjustable feedback or reference networks for setting circuit parameters.
- Electronic Prototyping & PCB Development: Supports resistance adjustment during circuit development, testing and board calibration.
Package Includes
- 2 × 20KΩ 500mW Cermet Trimming Potentiometer, 10% Tolerance, Three-Pin Through-Hole Type
Product Specifications
| Parameter | Specification |
|---|---|
| Product Type | Trimming Potentiometer (Trimpot) |
| Nominal Resistance | 20kΩ |
| Resistance Tolerance | 10% |
| Power Rating | 500mW (0.5W) |
| Adjustment Type | Top-Slot Adjustment |
| Number of Turns | 1 (Single-Turn) |
| Number of Terminals | 3 Pins |
| Mounting Type | Through-Hole PCB Mounting |
| Resistive Element Composition | Cermet |
| Construction | Sealed |
| Rotational Life | 200 Cycles |
| Temperature Coefficient | 100ppm/°C |
| Minimum Operating Temperature | −55°C |
| Maximum Operating Temperature | +125°C |
| Package Quantity | 2 Pieces |
Installation & Operating Recommendations
- PCB Mounting: Align all three terminals with the corresponding PCB holes and maintain the intended component orientation during installation.
- Soldering: Use controlled soldering conditions appropriate for through-hole electronic components. Avoid excessive heat exposure and unnecessary mechanical stress on the terminals.
- Adjustment Tool: Use a suitably sized adjustment tool that fits the top slot correctly to minimise wear or damage during calibration.
- Power Dissipation: Keep the operating power within the 500mW rating and consider the effect of ambient temperature and PCB thermal conditions.
- Resistance Configuration: Confirm the intended terminal connections against the circuit schematic before applying power, particularly when configuring the component as a voltage divider or variable resistor.
- Calibration: Make gradual adjustments while monitoring the relevant circuit output or measurement point to achieve the required setting.
- Temperature Conditions: Operate the component within its −55°C to +125°C specified temperature range.
- Mechanical Handling: Avoid excessive adjustment force and unnecessary repeated rotation during installation and calibration.
