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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Description Price Maximum Resistance Mounting Type Number of Turns Orientation Power Rating Series Termination Style Length Tolerance Depth Temperature Coefficient Height Dimensions Maximum Voltage Rating
RS stock no. 652-4912
Mfr. Part No.416MA104P
R 7.561
Each (In a Pack of 10)
units
100 kΩ Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS stock no. 168-0952
Mfr. Part No.416MA104P
R 4.94
Each (On a Reel of 1000)
units
100 kΩ Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS stock no. 161-5566
Mfr. Part No.PC910 1K RS
R 119.814
Each (In a Box of 100)
units
1 kΩ Through Hole 1 Top Adjust 1W PC910 Pin - ±20% - - - - -
RS stock no. 186-154
Mfr. Part No.PC910 1K RS
R 222.90
Each
units
1 kΩ Through Hole 1 Top Adjust 1W PC910 Pin - ±20% - - - - -
RS stock no. 652-4322
Mfr. Part No.416PA501M
R 5.136
Each (In a Pack of 10)
units
500 Ω Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±20% - ±250ppm/°C - - -
RS stock no. 163-9529
Mfr. Part No.416MA103P
R 11.181
Each (In a Box of 500)
units
10 kΩ Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS stock no. 652-4259
Mfr. Part No.416PA101M
R 3.995
Each (In a Pack of 10)
units
100 Ω Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±20% - ±250ppm/°C - - -
RS stock no. 652-4164
Mfr. Part No.416MA102P
R 5.003
Each (In a Pack of 10)
units
1 kΩ Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS stock no. 161-9911
Mfr. Part No.416MA102P
R 4.554
Each (In a Bag of 500)
units
1 kΩ Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS stock no. 168-0369
Mfr. Part No.416PA101M
R 3.907
Each (On a Reel of 1000)
units
100 Ω Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±20% - ±250ppm/°C - - -
RS stock no. 652-4170
Mfr. Part No.416MA103P
R 12.647
Each (In a Pack of 10)
units
10 kΩ Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS stock no. 163-9455
Mfr. Part No.3213X501M
R 18.451
Each (On a Reel of 500)
units
500 Ω Surface Mount 1 Top Adjust 0.125W 3213 J-Hook 3.4mm ±20% - ±100ppm/°C - - -
RS stock no. 473-534
Mfr. Part No.CB10LV471M
R 7.116
Each (In a Pack of 5)
units
470 Ω Through Hole 1 Top Adjust 0.15W CB10 Pin 11mm ±20% - ±500ppm/°C - - -
RS stock no. 168-0398
Mfr. Part No.409VA503M
R 6.43
Each (On a Reel of 1000)
units
50 kΩ Through Hole 1 Side Adjust 0.5W 409 Pin 9mm ±20% - ±250ppm/°C - - -
RS stock no. 161-5586
Mfr. Part No.416XA203P
R 5.574
Each (In a Box of 500)
units
20 kΩ Through Hole 1 Side Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS stock no. 652-4350
Mfr. Part No.416XA102P
R 6.137
Each (In a Pack of 10)
units
1 kΩ Through Hole 1 Side Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS stock no. 652-4754
Mfr. Part No.409VA504M
R 6.098
Each (In a Pack of 5)
units
500 kΩ Through Hole 1 Side Adjust 0.5W 409 Pin 9mm ±20% - ±250ppm/°C - - -
RS stock no. 168-0373
Mfr. Part No.416XA102P
R 5.213
Each (On a Reel of 1000)
units
1 kΩ Through Hole 1 Side Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS stock no. 168-0248
Mfr. Part No.409VA105M
R 10.497
Each (In a Box of 200)
units
1 MΩ Through Hole 1 Side Adjust 0.5W 409 Pin 9mm ±20% - ±250ppm/°C - - -
RS stock no. 652-4631
Mfr. Part No.409VA105M
R 12.31
Each
units
1 MΩ Through Hole 1 Side Adjust 0.5W 409 Pin 9mm ±20% - ±250ppm/°C - - -