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. 652-4697
Mfr. Part No.409VA103M
HK$11.87
Each
units
10 kΩ Through Hole 1 Side Adjust 0.5W 409 Pin 9mm ±20% - ±250ppm/°C - - -
RS Stock No. 183-1350
Mfr. Part No.M63M203KB40
BrandVishay
HK$78.94
Each
units
20 kΩ Through Hole 1 Top Adjust 0.5W 63M Pin 9.52mm ±10% - ±100ppm/°C - - -
RS Stock No. 743-2372
Mfr. Part No.3314J-1-105E
BrandBourns
HK$17.80
Each (In a Pack of 5)
units
1 MΩ Surface Mount 1 Top Adjust 0.25W 3314 J-Hook 4.5mm ±20% - ±100ppm/°C - - -
RS Stock No. 521-9091
Mfr. Part No.3006P-1-203LF
BrandBourns
HK$16.91
Each
units
20 kΩ Through Hole 15 Side Adjust 0.75W 3006 Pin 20.57mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9164
Mfr. Part No.3266W-1-101LF
BrandBourns
HK$36.67
Each
units
100 Ω Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3361
Mfr. Part No.3266W-1-102LF
BrandBourns
HK$24.871
Each (In a Tube of 50)
units
1 kΩ Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-0350
Mfr. Part No.3299W-1-203LF
BrandBourns
HK$27.56
Each
units
20 kΩ Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3553
Mfr. Part No.3266W-1-101LF
BrandBourns
HK$26.18
Each (In a Tube of 50)
units
100 Ω Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
RS Stock No. 374-6923
Mfr. Part No.T7YB103MT20
BrandVishay
HK$16.414
Each (In a Pack of 5)
units
10 kΩ Through Hole 1 Top Adjust 0.5W T7 Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 521-9710
Mfr. Part No.3296W-1-203LF
BrandBourns
HK$25.30
Each
units
20 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-5452
Mfr. Part No.3314J-1-105E
BrandBourns
HK$9.75
Each (On a Reel of 500)
units
1 MΩ Surface Mount 1 Top Adjust 0.25W 3314 J-Hook 4.5mm ±20% - ±100ppm/°C - - -
RS Stock No. 769-2176
Mfr. Part No.PV36W202C01B00
BrandBourns
HK$14.55
Each
units
2 kΩ Through Hole 25 Top Adjust 0.5W PV36 Solder Pin 9.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 785-9767
Mfr. Part No.3296Y-1-222LF
BrandBourns
HK$19.10
Each
units
2.2 kΩ Through Hole 25 Top Adjust 0.5W 3296 Solder Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-5321
Mfr. Part No.PV36W202C01B00
BrandBourns
HK$10.135
Each (In a Tube of 50)
units
2 kΩ Through Hole 25 Top Adjust 0.5W PV36 Solder Pin 9.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9192
Mfr. Part No.3266W-1-103LF
BrandBourns
HK$26.46
Each
units
10 kΩ Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
RS Stock No. 474-6946
Mfr. Part No.CT-6EP 500 Ohm
HK$9.264
Each (In a Pack of 5)
units
500 Ω Through Hole 1 Top Adjust 0.5W CT-6 Pin 7mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9653
Mfr. Part No.3296W-1-104LF
BrandBourns
HK$25.30
Each
units
100 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3378
Mfr. Part No.3296W-1-104LF
BrandBourns
HK$17.718
Each (In a Tube of 50)
units
100 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3405
Mfr. Part No.3296Y-1-103LF
BrandBourns
HK$15.66
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. 788-5025
Mfr. Part No.T93XA102KT20
BrandVishay
HK$15.686
Each (In a Pack of 5)
units
1 kΩ Through Hole 21 Side Adjust 0.5W T93 Pin 9.7mm ±10% - ±100ppm/°C - - -
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