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. 521-9647
Mfr. Part No.3296W-1-103LF
BrandBourns
HK$27.78
Each
units
10 kΩ 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
HK$19.583
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. 167-3265
Mfr. Part No.3362P-1-504LF
BrandBourns
HK$7.004
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. 521-9798
Mfr. Part No.3296W-1-502LF
BrandBourns
HK$27.78
Each
units
5 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3491
Mfr. Part No.3296W-1-502LF
BrandBourns
HK$19.583
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. 691-6951
Mfr. Part No.3312J-1-202E
BrandBourns
HK$21.39
Each
units
2 kΩ Surface Mount 1 Top Adjust 0.1W 3312 J-Hook 2.5mm ±20% - ±100ppm/°C - - -
RS Stock No. 167-4457
Mfr. Part No.3312J-1-202E
BrandBourns
HK$12.222
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. 522-1000
Mfr. Part No.3362P-1-504LF
BrandBourns
HK$9.86
Each
units
500 kΩ Through Hole 1 Top Adjust 0.5W 3362 Pin 6.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3411
Mfr. Part No.3299W-1-202LF
BrandBourns
HK$22.032
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. 521-9287
Mfr. Part No.3266W-1-502LF
BrandBourns
HK$37.38
Each
units
5 kΩ Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
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. 461-7258
Mfr. Part No.TC33X-2-104E
BrandBourns
HK$1.922
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. 167-3384
Mfr. Part No.3296W-1-202LF
BrandBourns
HK$16.265
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. 167-3454
Mfr. Part No.3386F-1-202TLF
BrandBourns
HK$16.895
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. 521-9704
Mfr. Part No.3296W-1-202LF
BrandBourns
HK$22.55
Each
units
2 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3430
Mfr. Part No.3329H-1-102LF
BrandBourns
HK$21.389
Each (In a Tube of 50)
units
1 kΩ Through Hole 1 Top Adjust 0.5W 3329 Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 522-0726
Mfr. Part No.3329H-1-102LF
BrandBourns
HK$27.68
Each
units
1 kΩ Through Hole 1 Top Adjust 0.5W 3329 Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 167-3357
Mfr. Part No.3266W-1-502LF
BrandBourns
HK$27.489
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. 167-3376
Mfr. Part No.3296W-1-102LF
BrandBourns
HK$19.583
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. 167-5319
Mfr. Part No.PV36W203C01B00
BrandBourns
HK$22.13
Each (In a Tube of 50)
units
20 kΩ Through Hole 25 Top Adjust 0.5W PV36 Solder Pin 9.6mm ±10% - ±100ppm/°C - - -