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. 522-0287
Mfr. Part No.3299W-1-102LF
BrandBourns
£2.72
Each
Units
1kΩ Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3497
Mfr. Part No.3296W-1-101LF
BrandBourns
£1.24
Each (In a Tube of 50)
Units
100Ω Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9625
Mfr. Part No.3296W-1-101LF
BrandBourns
£2.07
Each
Units
100Ω Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3387
Mfr. Part No.3299W-1-102LF
BrandBourns
£1.66
Each (In a Tube of 50)
Units
1kΩ Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 461-7135
Mfr. Part No.TC33X-2-103E
BrandBourns
£0.162
Each (In a Pack of 50)
Units
10kΩ Surface Mount 1 Top Adjust 0.1W TC33 Solder Pad 3mm ±25% - ±250ppm/°C - - -
RS Stock No. 522-0063
Mfr. Part No.3296Y-1-102LF
BrandBourns
£2.07
Each
Units
1kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 154-2066
Mfr. Part No.M64W503KB40
BrandVishay
£2.02
Each
Units
50kΩ 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. 167-3549
Mfr. Part No.TC33X-2-103E
BrandBourns
£0.093
Each (On a Reel of 2500)
Units
10kΩ Surface Mount 1 Top Adjust 0.1W TC33 Solder Pad 3mm ±25% - ±250ppm/°C - - -
RS Stock No. 169-3104
Mfr. Part No.M64Y103KB40
BrandVishay
£0.97
Each (In a Box of 200)
Units
10kΩ Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 0.5W 64Y Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 154-2432
Mfr. Part No.M64Y103KB40
BrandVishay
£1.98
Each
Units
10kΩ 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. 167-3404
Mfr. Part No.3296Y-1-102LF
BrandBourns
£1.24
Each (In a Tube of 50)
Units
1kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 169-3081
Mfr. Part No.M64W503KB40
BrandVishay
£1.32
Each (In a Box of 200)
Units
50kΩ Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 0.5W 64W Pin 9.7mm ±10% - - - - -
RS Stock No. 169-3140
Mfr. Part No.T63YB103KT20
BrandVishay
£1.43
Each (In a Tube of 50)
Units
10kΩ Through Hole 14 Top Adjust 0.25W T63 Pin 6.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 851-7483
Mfr. Part No.RJ24FW103
BrandBourns
£4.11
Each
Units
10kΩ Panel Mount 25 - 0.5W RJ24 PC Pin 11.55mm ±10% - - - - -
RS Stock No. 167-9598
Mfr. Part No.M43P103KB30T601
BrandVishay
£2.15
Each (In a Box of 100)
Units
10kΩ Panel Mount, Through Hole 20 Side Adjust 0.5W 43P Pin 27.81mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9704
Mfr. Part No.3296W-1-202LF
BrandBourns
£1.86
Each
Units
2kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3384
Mfr. Part No.3296W-1-202LF
BrandBourns
£1.40
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. 374-7077
Mfr. Part No.T63YB103KT20
BrandVishay
£2.26
Each
Units
10kΩ Through Hole 14 Top Adjust 0.25W T63 Pin 6.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 277-0212
Mfr. Part No.M43P103KB30T601
BrandVishay
£4.16
Each
Units
10kΩ Panel Mount, Through Hole 20 Side Adjust 0.5W 43P Pin 27.81mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3465
Mfr. Part No.3386F-1-504LF
BrandBourns
£0.774
Each (In a Tube of 50)
Units
500kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
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