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. 154-2432
Mfr. Part No.M64Y103KB40
BrandVishay
SGD4.21
Each
units
10kΩ Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 1/2W 64Y Pin 9.7mm ±10% 5mm ±100ppm/°C 11.1mm 9.7 x 5 x 11.1mm -
RS Stock No. 169-3104
Mfr. Part No.M64Y103KB40
BrandVishay
SGD2.426
Each (In a Box of 200)
units
10kΩ Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 0.5W 64Y Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-9659
Mfr. Part No.M63M104KB40
BrandVishay
SGD4.045
Each (In a Box of 400)
units
100kΩ Through Hole 1 Top Adjust 0.5W 63M Pin 9.52mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9192
Mfr. Part No.3266W-1-103LF
BrandBourns
SGD6.16
Each
units
10kΩ Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3353
Mfr. Part No.3266W-1-202LF
BrandBourns
SGD4.528
Each (In a Tube of 50)
units
2kΩ Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9243
Mfr. Part No.3266W-1-202LF
BrandBourns
SGD6.10
Each
units
2kΩ Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
RS Stock No. 183-1372
Mfr. Part No.M63M104KB40
BrandVishay
SGD3.69
Each
units
100kΩ Through Hole 1 Top Adjust 0.5W 63M Pin 9.52mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9647
Mfr. Part No.3296W-1-103LF
BrandBourns
SGD3.59
Each
units
10kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3377
Mfr. Part No.3296W-1-103LF
BrandBourns
SGD2.426
Each (In a Tube of 50)
units
10kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 474-6996
Mfr. Part No.CT-6EP 10k Ohm
SGD2.164
Each (In a Pack of 5)
units
10kΩ Through Hole 1 Top Adjust 0.5W CT-6 Pin 7mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3362
Mfr. Part No.3266W-1-103LF
BrandBourns
SGD3.863
Each (In a Tube of 50)
units
10kΩ Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3469
Mfr. Part No.3386P-1-102LF
BrandBourns
SGD1.587
Each (In a Tube of 50)
units
1kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-2687
Mfr. Part No.3386P-1-102LF
BrandBourns
SGD2.37
Each
units
1kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-2255
Mfr. Part No.3386F-1-104TLF
BrandBourns
SGD3.78
Each
units
100kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3450
Mfr. Part No.3386F-1-103TLF
BrandBourns
SGD2.752
Each (In a Tube of 50)
units
10kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-5333
Mfr. Part No.93R1A-R22-A20L
BrandBourns
SGD9.40
Each
units
100kΩ Panel Mount, Through Hole 1 Side Adjust 2W 93 Pin 34.7mm ±10% - ±150ppm/°C - - -
RS Stock No. 522-2233
Mfr. Part No.3386F-1-103TLF
BrandBourns
SGD3.68
Each
units
10kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3451
Mfr. Part No.3386F-1-104TLF
BrandBourns
SGD2.425
Each (In a Tube of 50)
units
100kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 161-6881
Mfr. Part No.93R1A-R22-A20L
BrandBourns
SGD7.30
Each (In a Tray of 45)
units
100kΩ Panel Mount, Through Hole 1 Side Adjust 2W 93 Pin 34.7mm ±10% - ±150ppm/°C - - -
RS Stock No. 521-9085
Mfr. Part No.3006P-1-202LF
BrandBourns
SGD3.36
Each
units
2kΩ Through Hole 15 Side Adjust 0.75W 3006 Pin 20.57mm ±10% - ±100ppm/°C - - -
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