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
$4.92
Each
units
10kΩ 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
$3.05
Each (In a Tube of 50)
units
10kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 748-1333
Mfr. Part No.3306W-1-103
BrandBourns
$0.617
Each (In a Pack of 10)
units
10kΩ Through Hole 1 Side Adjust 0.2W 3306 Pin 6.81mm ±25% - ±250ppm/°C - - -
RS Stock No. 167-5361
Mfr. Part No.3306W-1-103
BrandBourns
$0.484
Each (In a Bag of 200)
units
10kΩ Through Hole 1 Side Adjust 0.2W 3306 Pin 6.81mm ±25% - ±250ppm/°C - - -
RS Stock No. 167-5362
Mfr. Part No.3306W-1-104
BrandBourns
$0.437
Each (In a Bag of 200)
units
100kΩ Through Hole 1 Side Adjust 0.2W 3306 Pin 6.81mm ±25% - ±250ppm/°C - - -
RS Stock No. 748-1336
Mfr. Part No.3306W-1-104
BrandBourns
$0.504
Each (In a Pack of 10)
units
100kΩ Through Hole 1 Side Adjust 0.2W 3306 Pin 6.81mm ±25% - ±250ppm/°C - - -
RS Stock No. 748-1355
Mfr. Part No.3306W-1-502
BrandBourns
$0.504
Each (In a Pack of 10)
units
5kΩ Through Hole 1 Side Adjust 0.2W 3306 Pin 6.81mm ±25% - ±250ppm/°C - - -
RS Stock No. 167-5365
Mfr. Part No.3306W-1-502
BrandBourns
$0.437
Each (In a Bag of 200)
units
5kΩ Through Hole 1 Side Adjust 0.2W 3306 Pin 6.81mm ±25% - ±250ppm/°C - - -
RS Stock No. 154-1271
Mfr. Part No.M64W203KB40
BrandVishay
$4.09
Each
units
20kΩ 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. 169-3069
Mfr. Part No.M64W203KB40
BrandVishay
$3.25
Each (In a Box of 200)
units
20kΩ Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 0.5W 64W Pin 9.7mm ±10% - - - - -
RS Stock No. 162-2606
Mfr. Part No.3299P-1-100LF
BrandBourns
$3.67
Each (In a Tube of 50)
units
10Ω Through Hole 25 Top Adjust 0.5W 3299 Solder Pin 10.03mm ±10% - ±100ppm/°C - - -
RS Stock No. 796-4989
Mfr. Part No.3299P-1-100LF
BrandBourns
$6.12
Each
units
10Ω Through Hole 25 Side Adjust 0.5W 3229 Solder Pin 10.03mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9805
Mfr. Part No.3296W-1-503LF
BrandBourns
$3.96
Each
units
50kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3364
Mfr. Part No.3296W-1-503LF
BrandBourns
$2.46
Each (In a Tube of 50)
units
50kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-9963
Mfr. Part No.T93YB203KT20
BrandVishay
$1.54
Each (In a Tube of 50)
units
20kΩ Through Hole 21 (Electrical) Turns, 23 (Mechanical) Turns Top Adjust 0.5W T93 Pin 9.7mm ±10% - - - - -
RS Stock No. 154-2549
Mfr. Part No.M63M103KB30T607
BrandVishay
$4.91
Each
units
10kΩ Through Hole 1 Top Adjust 0.5W 63M Pin 9.52mm ±10% - ±100ppm/°C - - -
RS Stock No. 474-7589
Mfr. Part No.CT-94EW 20k Ohm
$5.80
Each
units
20kΩ Through Hole 18 Top Adjust 0.5W CT-94 Pin 9.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-9649
Mfr. Part No.M63M103KB30T607
BrandVishay
$4.599
Each (In a Box of 400)
units
10kΩ Through Hole 1 Top Adjust 0.5W 63M Pin 9.52mm ±10% - ±100ppm/°C - - -
RS Stock No. 788-5123
Mfr. Part No.T93YB203KT20
BrandVishay
$2.294
Each (In a Pack of 5)
units
20kΩ Through Hole 21 (Electrical) Turns, 23 (Mechanical) Turns Top Adjust 0.5W T93 Pin 9.7mm ±10% - - - - -
RS Stock No. 167-3259
Mfr. Part No.3362P-1-203LF
BrandBourns
$1.429
Each (In a Tube of 50)
units
20kΩ Through Hole 1 Top Adjust 0.5W 3362 Pin 6.6mm ±10% - ±100ppm/°C - - -
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