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. 167-3504
Mfr. Part No.3296Y-1-502LF
BrandBourns
R 23.774
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. 473-473
Mfr. Part No.CB10LV103M
R 6.088
Each (In a Pack of 5)
units
10 kΩ Through Hole 1 Top Adjust 3/20W CB10LV Pin 11mm ±20% - ±500ppm/°C - - -
RS stock no. 522-0215
Mfr. Part No.3296Y-1-502LF
BrandBourns
R 34.30
Each
units
5 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS stock no. 769-2182
Mfr. Part No.PV36W501C01B00
BrandBourns
R 28.84
Each
units
500 Ω Through Hole 25 Top Adjust 0.5W PV36 Solder Pin 9.6mm ±10% - ±100ppm/°C - - -
RS stock no. 167-5322
Mfr. Part No.PV36W501C01B00
BrandBourns
R 16.472
Each (In a Tube of 50)
units
500 Ω Through Hole 25 Top Adjust 0.5W PV36 Solder Pin 9.6mm ±10% - ±100ppm/°C - - -
RS stock no. 769-2167
Mfr. Part No.PV36W103C01B00
BrandBourns
R 28.87
Each
units
10 kΩ Through Hole 25 Top Adjust 0.5W PV36 Solder Pin 9.6mm ±10% - ±100ppm/°C - - -
RS stock no. 167-0112
Mfr. Part No.3224X-1-202E
BrandBourns
R 38.714
Each (On a Reel of 200)
units
2 kΩ Surface Mount 12 Top Adjust 0.25W 3224 Gull Wing 4.8mm ±10% - ±100ppm/°C - - -
RS stock no. 796-4894
Mfr. Part No.3224X-1-202E
BrandBourns
R 59.24
Each
units
2 kΩ Surface Mount 12 Top Adjust 0.25W 3224 Gull Wing 4.8mm ±10% - ±100ppm/°C - - -
RS stock no. 796-4875
Mfr. Part No.3224X-1-101E
BrandBourns
R 72.77
Each
units
100 Ω Surface Mount 12 Top Adjust 0.25W 3224 Gull Wing 4.8mm ±10% - ±100ppm/°C - - -
RS stock no. 167-0104
Mfr. Part No.3224X-1-101E
BrandBourns
R 39.254
Each (On a Reel of 200)
units
100 Ω Surface Mount 12 Top Adjust 0.25W 3224 Gull Wing 4.8mm ±10% - ±100ppm/°C - - -
RS stock no. 167-3480
Mfr. Part No.3386P-1-504LF
BrandBourns
R 17.397
Each (In a Tube of 50)
units
500 kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS stock no. 162-2500
Mfr. Part No.3306P-1-501
BrandBourns
R 4.489
Each (In a Bag of 200)
units
500 Ω Through Hole 1 Top Adjust 0.2W 3306 Pin 6.81mm ±25% - ±250ppm/°C - - -
RS stock no. 488-5293
Mfr. Part No.3306P-1-501
BrandBourns
R 6.811
Each (In a Pack of 10)
units
500 Ω Through Hole 1 Top Adjust 0.2W 3306 Pin 6.81mm ±25% - ±250ppm/°C - - -
RS stock no. 167-3378
Mfr. Part No.3296W-1-104LF
BrandBourns
R 23.846
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. 769-2195
Mfr. Part No.PV36W503C01B00
BrandBourns
R 22.42
Each
units
50 kΩ Through Hole 25 Top Adjust 0.5W PV36 Solder Pin 9.6mm ±10% - ±100ppm/°C - - -
RS stock no. 167-3377
Mfr. Part No.3296W-1-103LF
BrandBourns
R 24.013
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. 154-2022
Mfr. Part No.M64W102KB40
BrandVishay
R 38.78
Each
units
1 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. 521-9653
Mfr. Part No.3296W-1-104LF
BrandBourns
R 41.54
Each
units
100 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS stock no. 167-9960
Mfr. Part No.T93YB103KT20
BrandVishay
R 16.163
Each (In a Tube of 50)
units
10 kΩ Through Hole 21 (Electrical) Turns, 23 (Mechanical) Turns Top Adjust 0.5W T93 Pin 9.7mm ±10% - ±100ppm/°C - - -
RS stock no. 788-5114
Mfr. Part No.T93YB103KT20
BrandVishay
R 21.11
Each (In a Pack of 5)
units
10 kΩ Through Hole 21 (Electrical) Turns, 23 (Mechanical) Turns Top Adjust 0.5W T93 Pin 9.7mm ±10% - ±100ppm/°C - - -