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. 522-0401
Mfr. Part No.3299W-1-503LF
BrandBourns
SGD5.28
Each
units
50kΩ Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 169-3076
Mfr. Part No.M64W102KB40
BrandVishay
SGD3.058
Each (In a Box of 200)
units
1kΩ Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 0.5W 64W Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 240-1562
Mfr. Part No.3214W-1-103E
BrandBourns
SGD4.014
Each (In a Pack of 5)
units
10kΩ Surface Mount 5 Top Adjust 0.25W 3214 J-Hook 4.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3545
Mfr. Part No.3214W-1-103E
BrandBourns
SGD2.732
Each (On a Reel of 250)
units
10kΩ Surface Mount 5 Top Adjust 0.25W 3214 J-Hook 4.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-0013
Mfr. Part No.3296X-1-504LF
BrandBourns
SGD2.97
Each
units
500kΩ Through Hole 25 Side Adjust 0.5W 3296 Pin 11.05mm ±10% - ±100ppm/°C - - -
RS Stock No. 161-9911
Mfr. Part No.416MA102P
SGD0.432
Each (In a Bag of 500)
units
1kΩ Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 167-3457
Mfr. Part No.3386H-1-501LF
BrandBourns
SGD1.587
Each (In a Tube of 50)
units
500Ω Through Hole 1 Side Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 154-2022
Mfr. Part No.M64W102KB40
BrandVishay
SGD3.39
Each
units
1kΩ 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. 154-2549
Mfr. Part No.M63M103KB30T607
BrandVishay
SGD4.56
Each
units
10kΩ Through Hole 1 Top Adjust 0.5W 63M Pin 9.52mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-9658
Mfr. Part No.M63M502KB30T607
BrandVishay
SGD3.309
Each (In a Box of 400)
units
5kΩ Through Hole 1 Top Adjust 0.5W 63M Pin 9.52mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-9649
Mfr. Part No.M63M103KB30T607
BrandVishay
SGD3.282
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. 167-3357
Mfr. Part No.3266W-1-502LF
BrandBourns
SGD3.863
Each (In a Tube of 50)
units
5kΩ Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
RS Stock No. 474-9276
Mfr. Part No.RJ-13PR 2k Ohm (202)
SGD8.77
Each
units
2kΩ Through Hole 1 - 0.75W - Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 154-2533
Mfr. Part No.M63M502KB30T607
BrandVishay
SGD4.10
Each
units
5kΩ Through Hole 1 Top Adjust 0.5W 63M Pin 9.52mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9287
Mfr. Part No.3266W-1-502LF
BrandBourns
SGD6.16
Each
units
5kΩ Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
RS Stock No. 652-4164
Mfr. Part No.416MA102P
SGD0.756
Each (In a Pack of 10)
units
1kΩ Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 521-9704
Mfr. Part No.3296W-1-202LF
BrandBourns
SGD3.58
Each
units
2kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3423
Mfr. Part No.3299W-1-503LF
BrandBourns
SGD3.158
Each (In a Tube of 50)
units
50kΩ Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3384
Mfr. Part No.3296W-1-202LF
BrandBourns
SGD2.284
Each (In a Tube of 50)
units
2kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3398
Mfr. Part No.3296X-1-504LF
BrandBourns
SGD2.311
Each (In a Tube of 50)
units
500kΩ Through Hole 25 Side Adjust 0.5W 3296 Pin 11.05mm ±10% - ±100ppm/°C - - -
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