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. 788-5063
Mfr. Part No.T93YA501KT20
BrandVishay
MYR6.50
Each (In a Pack of 5)
units
500 Ω Through Hole 21 Top Adjust 0.5W T93 Pin 9.7mm ±10% - - - - -
RS Stock No. 167-9946
Mfr. Part No.T93YA501KT20
BrandVishay
MYR4.652
Each (In a Tube of 50)
units
500 Ω Through Hole 21 Top Adjust 0.5W T93 Pin 9.7mm ±10% - - - - -
RS Stock No. 167-9373
Mfr. Part No.T7YB101MT20
BrandVishay
MYR5.311
Each (In a Tube of 50)
units
100 Ω Through Hole 1 Top Adjust 0.5W T7 Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 374-6866
Mfr. Part No.T7YB101MT20
BrandVishay
MYR4.144
Each (In a Pack of 5)
units
100 Ω Through Hole 1 Top Adjust 0.5W T7 Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 522-2788
Mfr. Part No.3386P-1-503LF
BrandBourns
MYR6.54
Each
units
50 kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-0259
Mfr. Part No.3299W-1-100LF
BrandBourns
MYR8.06
Each
units
10 Ω Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 183-1344
Mfr. Part No.M63M103KB40
BrandVishay
MYR10.28
Each
units
10 kΩ Through Hole 1 Top Adjust 0.5W 63M Pin 9.52mm ±10% - ±100ppm/°C - - -
RS Stock No. 161-7068
Mfr. Part No.3299W-1-101LF
BrandBourns
MYR5.279
Each (In a Tube of 50)
units
100 Ω Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-9958
Mfr. Part No.T93YB102KT20
BrandVishay
MYR4.652
Each (In a Tube of 50)
units
1 kΩ Through Hole 21 Top Adjust 0.5W T93 Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-0710
Mfr. Part No.3329H-1-101LF
BrandBourns
MYR6.89
Each
units
100 Ω Through Hole 1 Top Adjust 0.5W 3329 Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 167-3386
Mfr. Part No.3299W-1-100LF
BrandBourns
MYR9.669
Each (In a Tube of 50)
units
10 Ω Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3428
Mfr. Part No.3329H-1-101LF
BrandBourns
MYR6.726
Each (In a Tube of 50)
units
100 Ω Through Hole 1 Top Adjust 0.5W 3329 Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 169-3140
Mfr. Part No.T63YB103KT20
BrandVishay
MYR7.73
Each (In a Tube of 50)
units
10 kΩ Through Hole 14 Top Adjust 0.25W T63 Pin 6.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 154-2246
Mfr. Part No.M64X103KB40
BrandVishay
MYR7.39
Each
units
10 kΩ Through Hole 19 (Electrical), 22 (Mechanical) Side Adjust 1/2W 64X Pin 11mm ±10% 5mm ±100ppm/°C 9.8mm 11 x 5 x 9.8mm -
RS Stock No. 169-3093
Mfr. Part No.M64X103KB40
BrandVishay
MYR7.285
Each (In a Box of 200)
units
10 kΩ Through Hole 19 (Electrical), 22 (Mechanical) Side Adjust 0.5W 64X Pin 11mm ±10% - ±100ppm/°C - - -
RS Stock No. 169-3117
Mfr. Part No.M63M103KB40
BrandVishay
MYR7.69
Each (In a Box of 200)
units
10 kΩ Through Hole 1 Top Adjust 0.5W 63M Pin 9.52mm ±10% - ±100ppm/°C - - -
RS Stock No. 788-5108
Mfr. Part No.T93YB102KT20
BrandVishay
MYR5.896
Each (In a Pack of 5)
units
1 kΩ Through Hole 21 Top Adjust 0.5W T93 Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 374-7077
Mfr. Part No.T63YB103KT20
BrandVishay
MYR9.00
Each
units
10 kΩ Through Hole 14 Top Adjust 0.25W T63 Pin 6.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-0265
Mfr. Part No.3299W-1-101LF
BrandBourns
MYR13.87
Each
units
100 Ω Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 154-2050
Mfr. Part No.M64W103KB40
BrandVishay
MYR9.90
Each
units
10 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 -
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