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. 167-3377
Mfr. Part No.3296W-1-103LF
BrandBourns
HK$18.65
Each (In a Tube of 50)
units
10 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9647
Mfr. Part No.3296W-1-103LF
BrandBourns
HK$25.30
Each
units
10 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 169-3080
Mfr. Part No.M64W103KB40
BrandVishay
HK$16.94
Each (In a Box of 200)
units
10 kΩ Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 0.5W 64W Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 154-2050
Mfr. Part No.M64W103KB40
BrandVishay
HK$21.33
Each
units
10 kΩ Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 1/2W 64W Pin 9.7mm ±10% 5mm ±100ppm/°C 11.1mm 9.7 x 5 x 11.1mm -
RS Stock No. 522-1000
Mfr. Part No.3362P-1-504LF
BrandBourns
HK$8.99
Each
units
500 kΩ Through Hole 1 Top Adjust 0.5W 3362 Pin 6.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3491
Mfr. Part No.3296W-1-502LF
BrandBourns
HK$18.65
Each (In a Tube of 50)
units
5 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 850-9625
Mfr. Part No.T73XX103KT20
BrandVishay
HK$8.64
Each
units
10 kΩ Through Hole 1 Side Adjust 0.5W T73 PC Pin 6.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-4457
Mfr. Part No.3312J-1-202E
BrandBourns
HK$11.72
Each (On a Reel of 500)
units
2 kΩ Surface Mount 1 Top Adjust 0.1W 3312 J-Hook 2.5mm ±20% - ±100ppm/°C - - -
RS Stock No. 521-9798
Mfr. Part No.3296W-1-502LF
BrandBourns
HK$25.30
Each
units
5 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3265
Mfr. Part No.3362P-1-504LF
BrandBourns
HK$6.67
Each (In a Tube of 50)
units
500 kΩ Through Hole 1 Top Adjust 0.5W 3362 Pin 6.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 691-6951
Mfr. Part No.3312J-1-202E
BrandBourns
HK$21.31
Each
units
2 kΩ Surface Mount 1 Top Adjust 0.1W 3312 J-Hook 2.5mm ±20% - ±100ppm/°C - - -
RS Stock No. 521-9704
Mfr. Part No.3296W-1-202LF
BrandBourns
HK$20.54
Each
units
2 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-2328
Mfr. Part No.3386F-1-202TLF
BrandBourns
HK$21.22
Each
units
2 kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3411
Mfr. Part No.3299W-1-202LF
BrandBourns
HK$21.39
Each (In a Tube of 50)
units
2 kΩ Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 162-2466
Mfr. Part No.T7YB102MT20
BrandVishay
HK$8.149
Each (In a Tube of 50)
units
1 kΩ Through Hole 1 Top Adjust 0.5W T7 Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 374-6894
Mfr. Part No.T7YB102MT20
BrandVishay
HK$14.298
Each (In a Pack of 5)
units
1 kΩ Through Hole 1 Top Adjust 0.5W T7 Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 167-3357
Mfr. Part No.3266W-1-502LF
BrandBourns
HK$26.18
Each (In a Tube of 50)
units
5 kΩ Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9625
Mfr. Part No.3296W-1-101LF
BrandBourns
HK$25.30
Each
units
100 Ω Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 461-7258
Mfr. Part No.TC33X-2-104E
BrandBourns
HK$1.76
Each (In a Pack of 50)
units
100 kΩ Surface Mount 1 Top Adjust 0.1W TC33 Solder Pad 3mm ±25% - ±250ppm/°C - - -
RS Stock No. 169-3075
Mfr. Part No.M64W501KB40
BrandVishay
HK$15.66
Each (In a Box of 200)
units
500 Ω Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 0.5W 64W Pin 9.7mm ±10% - - - - -
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