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. 167-9660
Mfr. Part No.M63M202KB30T607
BrandVishay
HK$18.136
Each (In a Box of 400)
units
2 kΩ Through Hole 1 Top Adjust 0.5W 63M Pin 9.52mm ±10% - ±100ppm/°C - - -
RS Stock No. 474-9305
Mfr. Part No.RJ-13PR 10k Ohm (103)
HK$53.22
Each
units
10 kΩ Through Hole 1 - 0.75W - Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 154-2016
Mfr. Part No.M64W501KB40
BrandVishay
HK$24.39
Each
units
500 Ω 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. 522-0726
Mfr. Part No.3329H-1-102LF
BrandBourns
HK$26.87
Each
units
1 kΩ Through Hole 1 Top Adjust 0.5W 3329 Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 154-2044
Mfr. Part No.M64W502KB40
BrandVishay
HK$28.38
Each
units
5 kΩ 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. 183-1209
Mfr. Part No.M63M202KB30T607
BrandVishay
HK$34.94
Each
units
2 kΩ Through Hole 1 Finger Adjust 1/2W 63M-T607 Pin 9.52mm ±10% 9.52mm ±100ppm/°C 10.41mm 9.52 x 9.52 x 10.41mm -
RS Stock No. 522-0344
Mfr. Part No.3299W-1-202LF
BrandBourns
HK$29.88
Each
units
2 kΩ Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 769-2170
Mfr. Part No.PV36W203C01B00
BrandBourns
HK$20.71
Each
units
20 kΩ Through Hole 25 Top Adjust 0.5W PV36 Solder Pin 9.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 169-3078
Mfr. Part No.M64W502KB40
BrandVishay
HK$19.00
Each (In a Box of 200)
units
5 kΩ Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 0.5W 64W Pin 9.7mm ±10% - - - - -
RS Stock No. 167-5319
Mfr. Part No.PV36W203C01B00
BrandBourns
HK$10.661
Each (In a Tube of 50)
units
20 kΩ Through Hole 25 Top Adjust 0.5W PV36 Solder Pin 9.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3376
Mfr. Part No.3296W-1-102LF
BrandBourns
HK$18.65
Each (In a Tube of 50)
units
1 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3384
Mfr. Part No.3296W-1-202LF
BrandBourns
HK$15.49
Each (In a Tube of 50)
units
2 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 851-7483
Mfr. Part No.RJ24FW103
BrandBourns
HK$47.93
Each
units
10 kΩ Panel Mount 25 - 0.5W RJ24 PC Pin 11.55mm ±10% - - - - -
RS Stock No. 167-3430
Mfr. Part No.3329H-1-102LF
BrandBourns
HK$20.37
Each (In a Tube of 50)
units
1 kΩ Through Hole 1 Top Adjust 0.5W 3329 Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 167-3550
Mfr. Part No.TC33X-2-104E
BrandBourns
HK$1.061
Each (On a Reel of 2500)
units
100 kΩ Surface Mount 1 Top Adjust 0.1W TC33 Solder Pad 3mm ±25% - ±250ppm/°C - - -
RS Stock No. 521-9287
Mfr. Part No.3266W-1-502LF
BrandBourns
HK$35.60
Each
units
5 kΩ Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
RS Stock No. 850-9643
Mfr. Part No.T73YE103KT20
BrandVishay
HK$8.88
Each
units
10 kΩ Through Hole 1 Top Adjust 0.5W T73 PC Pin 6.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3454
Mfr. Part No.3386F-1-202TLF
BrandBourns
HK$16.09
Each (In a Tube of 50)
units
2 kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9631
Mfr. Part No.3296W-1-102LF
BrandBourns
HK$25.30
Each
units
1 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3497
Mfr. Part No.3296W-1-101LF
BrandBourns
HK$18.65
Each (In a Tube of 50)
units
100 Ω Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -