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. 167-3475
Mfr. Part No.3386P-1-203LF
BrandBourns
SGD1.587
Each (In a Tube of 50)
units
20kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 486-7548
Mfr. Part No.TS53YL503MR10
BrandVishay
SGD2.25
Each (In a Pack of 5)
units
50kΩ Surface Mount 1 Top Adjust 0.25W TS53 Gull Wing 5mm ±20% - ±100ppm/°C - - -
RS Stock No. 521-9041
Mfr. Part No.3006P-1-103LF
BrandBourns
SGD2.56
Each
units
10kΩ Through Hole 15 Side Adjust 0.75W 3006 Pin 20.57mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9186
Mfr. Part No.3266W-1-102LF
BrandBourns
SGD6.16
Each
units
1kΩ Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9798
Mfr. Part No.3296W-1-502LF
BrandBourns
SGD3.13
Each
units
5kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 154-2353
Mfr. Part No.M64Y101KB40
BrandVishay
SGD2.84
Each
units
100Ω 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. 167-3236
Mfr. Part No.3006P-1-103LF
BrandBourns
SGD2.073
Each (In a Tube of 25)
units
10kΩ Through Hole 15 Side Adjust 0.75W 3006 Pin 20.57mm ±10% - ±100ppm/°C - - -
RS Stock No. 169-3098
Mfr. Part No.M64Y101KB40
BrandVishay
SGD2.128
Each (In a Box of 200)
units
100Ω Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 0.5W 64Y Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3491
Mfr. Part No.3296W-1-502LF
BrandBourns
SGD2.426
Each (In a Tube of 50)
units
5kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-2744
Mfr. Part No.3386P-1-203LF
BrandBourns
SGD2.02
Each
units
20kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-0394
Mfr. Part No.3299W-1-502LF
BrandBourns
SGD4.18
Each
units
5kΩ Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 374-7005
Mfr. Part No.T63YB101KT20
BrandVishay
SGD5.26
Each
units
100Ω Through Hole 14 Top Adjust 0.25W T63 Pin 6.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 162-625
Mfr. Part No.M43P504KB40
BrandVishay
SGD2.93
Each
units
500kΩ 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. 691-7415
Mfr. Part No.3314J-1-203E
BrandBourns
SGD3.116
Each (In a Pack of 5)
units
20kΩ Surface Mount 1 Top Adjust 0.25W 3314 J-Hook 4.5mm ±20% - ±100ppm/°C - - -
RS Stock No. 521-9631
Mfr. Part No.3296W-1-102LF
BrandBourns
SGD3.13
Each
units
1kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 486-7627
Mfr. Part No.TS53YJ103MR10
BrandVishay
SGD1.588
Each (In a Pack of 5)
units
10kΩ Surface Mount 1 Top Adjust 0.25W TS53 J-Hook 5mm ±20% - ±100ppm/°C - - -
RS Stock No. 169-3030
Mfr. Part No.M43P504KB40
BrandVishay
SGD2.313
Each (In a Box of 200)
units
500kΩ Through Hole 20 Side Adjust 0.5W 43P Pin 20.57mm ±10% - ±100ppm/°C - - -
RS Stock No. 788-5038
Mfr. Part No.T93XA103KT20
BrandVishay
SGD2.458
Each (In a Pack of 5)
units
10kΩ Through Hole 21 Side Adjust 0.5W T93 Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 169-3137
Mfr. Part No.T63YB101KT20
BrandVishay
SGD3.998
Each (In a Tube of 50)
units
100Ω Through Hole 14 Top Adjust 0.25W T63 Pin 6.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3376
Mfr. Part No.3296W-1-102LF
BrandBourns
SGD2.426
Each (In a Tube of 50)
units
1kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
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