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. 167-3422
Mfr. Part No.3299W-1-502LF
BrandBourns
€1.849
Each (In a Tube of 50)
units
5 kΩ Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-0394
Mfr. Part No.3299W-1-502LF
BrandBourns
€2.96
Each
units
5 kΩ Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9990
Mfr. Part No.3296X-1-502LF
BrandBourns
€2.02
Each
units
5 kΩ Through Hole 25 Side Adjust 0.5W 3296 Pin 11.05mm ±10% - ±100ppm/°C - - -
RS Stock No. 154-3031
Mfr. Part No.21A11B010
BrandVishay
€2.96
Each
units
50 kΩ Through Hole 1 Top Adjust 0.5W 63P Pin 9.52mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-9654
Mfr. Part No.21A11B010
BrandVishay
€1.463
Each (In a Box of 400)
units
50 kΩ Through Hole 1 Top Adjust 0.5W 63P Pin 9.52mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3502
Mfr. Part No.3296X-1-502LF
BrandBourns
€1.417
Each (In a Tube of 50)
units
5 kΩ Through Hole 25 Side Adjust 0.5W 3296 Pin 11.05mm ±10% - ±100ppm/°C - - -
RS Stock No. 162-209
Mfr. Part No.M43P102KB40
BrandVishay
€2.36
Each
units
1 kΩ Through Hole 20 Side Adjust 1/2W 43P Pin 20.57mm ±10% 4.83mm ±100ppm/°C 6.35mm 20.57 x 4.83 x 6.35mm -
RS Stock No. 167-9368
Mfr. Part No.T7YA473MT20
BrandVishay
€0.876
Each (In a Tube of 50)
units
47 kΩ Through Hole 1 Top Adjust 0.5W T7 Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 374-6800
Mfr. Part No.T7YA473MT20
BrandVishay
€2.608
Each (In a Pack of 5)
units
47 kΩ Through Hole 1 Top Adjust 0.5W T7 Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 154-2044
Mfr. Part No.M64W502KB40
BrandVishay
€2.38
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. 169-3021
Mfr. Part No.M43P102KB40
BrandVishay
€1.149
Each (In a Box of 200)
units
1 kΩ Through Hole 20 Side Adjust 0.5W 43P Pin 20.57mm ±10% - ±100ppm/°C - - -
RS Stock No. 169-3078
Mfr. Part No.M64W502KB40
BrandVishay
€1.202
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. 162-215
Mfr. Part No.M43P202KB40
BrandVishay
€2.20
Each
units
2 kΩ Through Hole 20 Side Adjust 1/2W 43P Pin 20.57mm ±10% 4.83mm ±100ppm/°C 6.35mm 20.57 x 4.83 x 6.35mm -
RS Stock No. 850-9643
Mfr. Part No.T73YE103KT20
BrandVishay
€1.13
Each
units
10 kΩ Through Hole 1 Top Adjust 0.5W T73 PC Pin 6.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-9961
Mfr. Part No.T93YB202KT20
BrandVishay
€0.988
Each (In a Tube of 50)
units
2 kΩ Through Hole 21 Top Adjust 0.5W T93 Pin 9.7mm ±10% - - - - -
RS Stock No. 167-3388
Mfr. Part No.3299W-1-103LF
BrandBourns
€1.927
Each (In a Tube of 50)
units
10 kΩ Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-5208
Mfr. Part No.3006P-7-202LF
BrandBourns
€1.672
Each (In a Tube of 25)
units
2 kΩ Through Hole 15 Side Adjust 0.75W 3006 Pin 19.05mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3241
Mfr. Part No.3006P-1-501LF
BrandBourns
€1.384
Each (In a Tube of 25)
units
500 Ω Through Hole 15 Side Adjust 0.75W 3006 Pin 20.57mm ±10% - ±100ppm/°C - - -
RS Stock No. 743-2268
Mfr. Part No.3006P-7-202LF
BrandBourns
€3.12
Each
units
2 kΩ Through Hole 15 Side Adjust 0.75W 3006 Pin 19.05mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9142
Mfr. Part No.3006P-1-503LF
BrandBourns
€1.87
Each
units
50 kΩ Through Hole 15 Side Adjust 0.75W 3006 Pin 20.57mm ±10% - ±100ppm/°C - - -
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