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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Beskrivning Pris Maximum Resistance Mounting Type Number of Turns Orientation Power Rating Series Termination Style Length Tolerance Depth Temperature Coefficient Height Dimensions Maximum Voltage Rating
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5kΩ Through Hole 25 Side Adjust 0.5W 3296 Pin 11.05mm ±10% - ±100ppm/°C - - -
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5kΩ Through Hole 25 Side Adjust 0.5W 3296 Pin 11.05mm ±10% - ±100ppm/°C - - -
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100Ω Through Hole 1 Top Adjust 0.5W T7 Pin - ±10% - ±100ppm/°C - - -
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100Ω Through Hole 1 Top Adjust 0.5W T7 Pin - ±10% - ±100ppm/°C - - -
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100Ω Through Hole 1 Top Adjust 0.5W 3329 Pin - ±10% - ±100ppm/°C - - -
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100kΩ Through Hole 1 Side Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
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50kΩ Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
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50kΩ Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
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100Ω Through Hole 1 Top Adjust 0.5W 3329 Pin - ±10% - ±100ppm/°C - - -
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Tillv. art.nr3386X-1-104LF
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100kΩ Through Hole 1 Side Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
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Tillv. art.nr3386X-1-503LF
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50kΩ Through Hole 1 Side Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
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50kΩ Through Hole 1 Side Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
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20Ω Through Hole 1 Top Adjust 0.5W 3329 Pin - ±10% - ±100ppm/°C - - -
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Tillv. art.nr3329H-1-200LF
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20Ω Through Hole 1 Top Adjust 0.5W 3329 Pin - ±10% - ±100ppm/°C - - -
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Tillv. art.nr3339P-1-101LF
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100Ω Through Hole 4 Top Adjust 0.5W 3339 Pin - ±10% - ±100ppm/°C - - -
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100Ω Through Hole 4 Top Adjust 0.5W 3339 Pin - ±10% - ±100ppm/°C - - -
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100Ω Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
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