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Trimmer Resistors

What are trimmer potentiometers?


Trimmer potentiometers, sometimes referred to as trim pots or trimmer resistors are a type of adjustable potentiometer (variable resistor). They are used to calibrate and fine-tune circuits. Trimmer potentiometers are typically constructed from cermet or have a carbon composition. They can be mounted directly onto PCBs (printed circuit boards).


Trimmer potentiometers are not adjusted very frequently. You can think of them as a ’set and forget’ component. Trim pots let you set (or trim) the resistance to obtain a very precise current, output voltage or gain. Once the value has been set, it is unlikely that you’ll need to adjust the trimmer again unless you need to recalibrate the circuit.


Can I replace a normal potentiometer with a trimmer potentiometer?


Yes, you can. However, trimmer potentiometers are typically more expensive than standard potentiometers with a fixed resistance rating. It is also worth bearing in mind the difference in lifespan too. Many potentiometers have a lifespan that allows for hundreds of thousands of cycles. Trimmer potentiometers typically have a lifespan of a few hundred cycles (at best). Trim pots also tend to take up more space on a PCB than a standard potentiometer.


Do I need a single turn or multiturn trim pot?


This completely depends on the intended application of the trim pot. Multiturn trimmer pots tend to have a higher resolution than single turn models. A single turn trimmer potentiometer is ideal for applications where a resolution of one turn is enough.


Adjustment types


Trimmer potentiometers are normally adjusted by hand (you can turn the adjustment knob with your fingers), with a screwdriver or with a specialised adjustment tool designed for use with a particular model or series.

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Part Details Brand Stock Maximum Resistance Mounting Type Number of Turns Orientation Power Rating Series Termination Style Tolerance Depth Temperature Coefficient Height Maximum Voltage Rating Dimensions Length Shaft Diameter Diameter Minimum Operating Temperature Maximum Operating Temperature Mechanical Rotation
10kΩ SMD Trimmer Potentiometer 0.25W Top Adjust Bourns PVG3 Series
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Bourns 890 10kΩ Surface Mount 1 Top Adjust 0.25W PVG3 Solder ±20% - ±150ppm/°C - - - 3.6mm - - -55°C +125°C -
50kΩ SMD Trimmer Potentiometer 0.5W Top Adjust Bourns 3361 Series Bourns 690 50kΩ Surface Mount 1 Top Adjust 0.5W 3361 PC Pin ±10% - ±100ppm/°C - 300 V - 6.71mm - - -55°C +125°C -
100kΩ SMD Trimmer Potentiometer 0.5W Top Adjust Bourns 3361 Series Bourns 670 100kΩ Surface Mount 1 Top Adjust 0.5W 3361 PC Pin ±10% - ±100ppm/°C - 300 V - 6.71mm - - -55°C +125°C -
10kΩ SMD Trimmer Potentiometer 0.5W Top Adjust Bourns 3361 Series Bourns 490 10kΩ Surface Mount 1 Top Adjust 0.5W 3361 PC Pin ±10% - ±100ppm/°C - 300 V - 6.71mm - - -55°C +125°C -
100kΩ Through Hole Trimmer Potentiometer 0.5W Side Adjust Bourns 3362 Series Bourns 245 100kΩ Through Hole 1 Side Adjust 0.5W 3362 PC Pin ±10% - ±100ppm/°C - 300 V - 6.6mm - - -55°C +125°C -
5kΩ Through Hole Trimmer Potentiometer 0.5W Side Adjust Bourns PV36 Series Bourns 165 5kΩ Through Hole 25 Side Adjust 0.5W PV36 PC Pin ±10% - ±100ppm/°C - - - 9.53mm - - -55°C +125°C -
100kΩ Through Hole Trimmer Potentiometer 0.5W Top Adjust Bourns 3299 Series Bourns 130 100kΩ Through Hole 25 Top Adjust 0.5W 3299 PC Pin ±10% - ±100ppm/°C - 300 V - 9.53mm - - -55°C +125°C -
10kΩ Through Hole Trimmer Potentiometer 0.5W Top Adjust Bourns 3299 Series Bourns 130 10kΩ Through Hole 25 Top Adjust 0.5W 3299 PC Pin ±10% - ±100ppm/°C - 300 V - 9.53mm - - -55°C +125°C -
1kΩ Through Hole Trimmer Potentiometer 0.5W Top Adjust Bourns PV36 Series Bourns 95 1kΩ Through Hole 25 Top Adjust 0.5W PV36 PC Pin ±10% - ±100ppm/°C - - - 9.53mm - - -55°C +125°C -
100kΩ SMD Trimmer Potentiometer 0.25W Side Adjust Copal Electronics SM-42 Series Copal Electronics 0 100kΩ Surface Mount 11 Side Adjust 0.25W SM-42 Solder ±10% - ±100ppm/°C - 158 V - 4.8mm - - -65°C +150°C -
100kΩ SMD Trimmer Potentiometer 0.25W Side Adjust Copal Electronics SM-42 Series Copal Electronics 0 100kΩ Surface Mount 11 Side Adjust 0.25W SM-42 Solder ±10% - ±100ppm/°C - 158 V - 4.8mm - - -65°C +150°C -
100kΩ SMD Trimmer Potentiometer 0.5W Top Adjust Bourns 3361 Series Bourns 0 100kΩ Surface Mount 1 Top Adjust 0.5W 3361 PC Pin ±10% - ±100ppm/°C - 300 V - 6.71mm - - -55°C +125°C -
100kΩ Through Hole Trimmer Potentiometer 0.5W Side Adjust Bourns 3362 Series Bourns 0 100kΩ Through Hole 1 Side Adjust 0.5W 3362 PC Pin ±10% - ±100ppm/°C - 300 V - 6.6mm - - -55°C +125°C -
100kΩ Through Hole Trimmer Potentiometer 0.5W Top Adjust Bourns 3299 Series Bourns 0 100kΩ Through Hole 25 Top Adjust 0.5W 3299 PC Pin ±10% - ±100ppm/°C - 300 V - 9.53mm - - -55°C +125°C -
100kΩ Through Hole Trimmer Potentiometer 0.75W Side Adjust Copal Electronics RJ-13 Series Copal Electronics 0 100kΩ Through Hole 1 Side Adjust 0.75W RJ-13 Solder ±10% - ±100ppm/°C - 274 V - - - 12.5mm -55°C +120°C 270°
100kΩ Through Hole Trimmer Potentiometer 0.75W Side Adjust Copal Electronics RJ-13 Series Copal Electronics 0 100kΩ Through Hole 1 Side Adjust 0.75W RJ-13 Solder ±10% - ±100ppm/°C - 274 V - - - 12.5mm -55°C +120°C 270°
10kΩ SMD Trimmer Potentiometer 0.25W Top Adjust Bourns PVG3 Series Bourns 0 10kΩ Surface Mount 1 Top Adjust 0.25W PVG3 Solder ±20% - ±150ppm/°C - - - 3.6mm - - -55°C +125°C -
10kΩ SMD Trimmer Potentiometer 0.5W Top Adjust Bourns 3361 Series Bourns 0 10kΩ Surface Mount 1 Top Adjust 0.5W 3361 PC Pin ±10% - ±100ppm/°C - 300 V - 6.71mm - - -55°C +125°C -
10kΩ Through Hole Trimmer Potentiometer 0.5W Top Adjust Bourns 3299 Series Bourns 0 10kΩ Through Hole 25 Top Adjust 0.5W 3299 PC Pin ±10% - ±100ppm/°C - 300 V - 9.53mm - - -55°C +125°C -
1kΩ Through Hole Trimmer Potentiometer 0.5W Top Adjust Bourns PV36 Series Bourns 0 1kΩ Through Hole 25 Top Adjust 0.5W PV36 PC Pin ±10% - ±100ppm/°C - - - 9.53mm - - -55°C +125°C -
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