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. 522-0259
Mfr. Part No.3299W-1-100LF
BrandBourns
$5.73
Each
units
10Ω Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3362
Mfr. Part No.3266W-1-103LF
BrandBourns
$5.17
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. 167-3504
Mfr. Part No.3296Y-1-502LF
BrandBourns
$3.68
Each (In a Tube of 50)
units
5kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 169-3094
Mfr. Part No.M64X203KB40
BrandVishay
$2.48
Each (In a Box of 200)
units
20kΩ Through Hole 19 (Electrical), 22 (Mechanical) Side Adjust 0.5W 64X Pin 11mm ±10% - - - - -
RS Stock No. 522-0085
Mfr. Part No.3296Y-1-104LF
BrandBourns
$4.85
Each
units
100kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-5341
Mfr. Part No.3296W-1-472LF
BrandBourns
$3.03
Each (In a Tube of 50)
units
4.7kΩ Through Hole 25 Top Adjust 0.5W 3296 Solder Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-4678
Mfr. Part No.3314J-1-503E
BrandBourns
$1.74
Each (On a Reel of 500)
units
50kΩ Surface Mount 1 Top Adjust 0.25W 3314 J-Hook 4.5mm ±20% - ±100ppm/°C - - -
RS Stock No. 169-3078
Mfr. Part No.M64W502KB40
BrandVishay
$3.75
Each (In a Box of 200)
units
5kΩ Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 0.5W 64W Pin 9.7mm ±10% - - - - -
RS Stock No. 522-0215
Mfr. Part No.3296Y-1-502LF
BrandBourns
$4.87
Each
units
5kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 850-9625
Mfr. Part No.T73XX103KT20
BrandVishay
$1.55
Each
units
10kΩ Through Hole 1 Side Adjust 0.5W T73 PC Pin 6.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 785-9755
Mfr. Part No.3296W-1-472LF
BrandBourns
$3.97
Each
units
4.7kΩ Through Hole 25 Top Adjust 0.5W 3296 Solder Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-4461
Mfr. Part No.3223J-1-105E
BrandBourns
$2.94
Each (On a Reel of 500)
units
1MΩ Surface Mount 11 Side Adjust 0.125W 3223 J-Hook 3.9mm ±20% - ±100ppm/°C - - -
RS Stock No. 521-9192
Mfr. Part No.3266W-1-103LF
BrandBourns
$7.03
Each
units
10kΩ Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-2429
Mfr. Part No.3386F-1-502TLF
BrandBourns
$3.92
Each
units
5kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3464
Mfr. Part No.3386F-1-502TLF
BrandBourns
$3.18
Each (In a Tube of 50)
units
5kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 154-2044
Mfr. Part No.M64W502KB40
BrandVishay
$5.44
Each
units
5kΩ Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 1/2W 64W Pin 9.7mm ±10% 5mm - 11.1mm 9.7 x 5 x 11.1mm -
RS Stock No. 169-3080
Mfr. Part No.M64W103KB40
BrandVishay
$3.35
Each (In a Box of 200)
units
10kΩ 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
$4.09
Each
units
10kΩ 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. 691-2454
Mfr. Part No.3223J-1-105E
BrandBourns
$7.58
Each
units
1MΩ Surface Mount 11 Side Adjust 0.125W 3223 J-Hook 3.9mm ±20% - ±100ppm/°C - - -
RS Stock No. 785-9767
Mfr. Part No.3296Y-1-222LF
BrandBourns
$3.97
Each
units
2.2kΩ Through Hole 25 Top Adjust 0.5W 3296 Solder Pin 9.53mm ±10% - ±100ppm/°C - - -
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