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. 167-5199
Mfr. Part No.3059Y-1-101LF
BrandBourns
MYR24.42
Each (In a Tube of 10)
units
100 Ω Through Hole 22 Side Adjust 1W 3059 Pin 31.75mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3353
Mfr. Part No.3266W-1-202LF
BrandBourns
MYR11.225
Each (In a Tube of 50)
units
2 kΩ Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
RS Stock No. 154-2353
Mfr. Part No.M64Y101KB40
BrandVishay
MYR6.78
Each
units
100 Ω Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 1/2W 64Y Pin 9.7mm ±10% 5mm ±100ppm/°C 11.1mm 9.7 x 5 x 11.1mm -
RS Stock No. 167-3470
Mfr. Part No.3386P-1-103LF
BrandBourns
MYR4.255
Each (In a Tube of 50)
units
10 kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 796-4829
Mfr. Part No.3329H-1-253LF
BrandBourns
MYR5.28
Each
units
25 kΩ Through Hole 1 Top Adjust 0.5W 3329 Solder Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 162-2618
Mfr. Part No.3329H-1-253LF
BrandBourns
MYR3.672
Each (In a Tube of 50)
units
25 kΩ Through Hole 1 Top Adjust 0.5W 3329 Solder Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 743-2280
Mfr. Part No.3059Y-1-101LF
BrandBourns
MYR28.51
Each
units
100 Ω Through Hole 22 Side Adjust 1W 3059 Pin 31.75mm ±10% - ±100ppm/°C - - -
RS Stock No. 169-3096
Mfr. Part No.M64X104KB40
BrandVishay
MYR7.285
Each (In a Box of 200)
units
100 kΩ Through Hole 19 (Electrical), 22 (Mechanical) Side Adjust 0.5W 64X Pin 11mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-9959
Mfr. Part No.T93YB502KT20
BrandVishay
MYR4.652
Each (In a Tube of 50)
units
5 kΩ Through Hole 21 Top Adjust 0.5W T93 Pin 9.7mm ±10% - - - - -
RS Stock No. 521-9243
Mfr. Part No.3266W-1-202LF
BrandBourns
MYR16.83
Each
units
2 kΩ Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
RS Stock No. 602-4440
Mfr. Part No.SM-3W 1k Ohm
MYR13.50
Each (In a Pack of 5)
units
1 kΩ Surface Mount 11 Top Adjust 0.125W SM-3 J-Hook 3.9mm ±20% - ±100ppm/°C - - -
RS Stock No. 167-3364
Mfr. Part No.3296W-1-503LF
BrandBourns
MYR7.20
Each (In a Tube of 50)
units
50 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-2693
Mfr. Part No.3386P-1-103LF
BrandBourns
MYR6.54
Each
units
10 kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9805
Mfr. Part No.3296W-1-503LF
BrandBourns
MYR9.45
Each
units
50 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 154-2274
Mfr. Part No.M64X104KB40
BrandVishay
MYR7.83
Each
units
100 kΩ Through Hole 19 (Electrical), 22 (Mechanical) Side Adjust 1/2W 64X Pin 11mm ±10% 5mm ±100ppm/°C 9.8mm 11 x 5 x 9.8mm -
RS Stock No. 154-2050
Mfr. Part No.M64W103KB40
BrandVishay
MYR9.90
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. 169-3080
Mfr. Part No.M64W103KB40
BrandVishay
MYR7.285
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. 788-5110
Mfr. Part No.T93YB502KT20
BrandVishay
MYR4.804
Each (In a Pack of 5)
units
5 kΩ Through Hole 21 Top Adjust 0.5W T93 Pin 9.7mm ±10% - - - - -
RS Stock No. 850-9729
Mfr. Part No.T93YA500KT20
BrandVishay
MYR6.95
Each
units
50 Ω Through Hole 21 (Electrical), 23 (Mechanical) Top Adjust 0.5W T93 PC Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 748-1333
Mfr. Part No.3306W-1-103
BrandBourns
MYR1.47
Each (In a Pack of 10)
units
10 kΩ Through Hole 1 Side Adjust 0.2W 3306 Pin 6.81mm ±25% - ±250ppm/°C - - -
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