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. 162-1634
Mfr. Part No.CB10LV105M
MYR0.741
Each (In a Box of 1000)
units
1MΩ Through Hole 1 Top Adjust 0.15W CB10 Pin 11mm ±20% - - - - -
RS Stock No. 473-578
Mfr. Part No.CB10LV105M
MYR1.06
Each (In a Pack of 5)
units
1MΩ Through Hole 1 Top Adjust 0.15W CB10 Pin 11mm ±20% - - - - -
RS Stock No. 163-9529
Mfr. Part No.416MA103P
MYR2.45
Each (In a Box of 500)
units
10kΩ Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 753-6809
Mfr. Part No.3142W103P
MYR7.24
Each
units
10kΩ Surface Mount 1 Top Adjust 0.15W 3142 Tab 4mm ±25% - ±250ppm/°C - - -
RS Stock No. 652-4170
Mfr. Part No.416MA103P
MYR3.996
Each (In a Pack of 10)
units
10kΩ Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 164-3578
Mfr. Part No.3142W103P
MYR4.468
Each (On a Reel of 800)
units
10kΩ Surface Mount 1 Top Adjust 0.15W 3142 Tab 4mm ±25% - ±250ppm/°C - - -
RS Stock No. 473-574
Mfr. Part No.CB10LV474M
MYR1.60
Each (In a Pack of 5)
units
470kΩ Through Hole 1 Top Adjust 0.15W CB10 Pin 11mm ±20% - - - - -
RS Stock No. 753-6812
Mfr. Part No.3142W203P
MYR6.21
Each
units
20kΩ Surface Mount 1 Top Adjust 0.15W 3142 Tab 4mm ±25% - ±250ppm/°C - - -
RS Stock No. 652-4697
Mfr. Part No.409VA103M
MYR2.62
Each
units
10kΩ Through Hole 1 Side Adjust 0.5W 409 Pin 9mm ±20% - ±250ppm/°C - - -
RS Stock No. 163-9532
Mfr. Part No.416PA502M
MYR2.417
Each (In a Bag of 500)
units
5kΩ Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±20% - ±250ppm/°C - - -
RS Stock No. 652-4372
Mfr. Part No.416PA502M
MYR2.836
Each (In a Pack of 10)
units
5kΩ Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±20% - ±250ppm/°C - - -
RS Stock No. 168-0248
Mfr. Part No.409VA105M
MYR2.856
Each (In a Box of 200)
units
1MΩ Through Hole 1 Side Adjust 0.5W 409 Pin 9mm ±20% - ±250ppm/°C - - -
RS Stock No. 168-0367
Mfr. Part No.416MA204P
MYR1.795
Each (On a Reel of 1000)
units
200kΩ Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 164-3582
Mfr. Part No.3142W203P
MYR4.572
Each (On a Reel of 800)
units
20kΩ Surface Mount 1 Top Adjust 0.15W 3142 Tab 4mm ±25% - ±250ppm/°C - - -
RS Stock No. 652-4221
Mfr. Part No.416MA204P
MYR2.836
Each (In a Pack of 10)
units
200kΩ Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 652-4631
Mfr. Part No.409VA105M
MYR2.94
Each
units
1MΩ Through Hole 1 Side Adjust 0.5W 409 Pin 9mm ±20% - ±250ppm/°C - - -
RS Stock No. 168-0257
Mfr. Part No.409VA103M
MYR1.877
Each (On a Reel of 1000)
units
10kΩ Through Hole 1 Side Adjust 0.5W 409 Pin 9mm ±20% - ±250ppm/°C - - -
RS Stock No. 161-4844
Mfr. Part No.CB10LH473M
MYR0.655
Each (In a Box of 500)
units
47kΩ Through Hole 1 Side Adjust 0.15W CB10 Pin 9.8mm ±20% - ±500ppm/°C - - -
RS Stock No. 473-518
Mfr. Part No.CB10LH473M
MYR0.858
Each (In a Pack of 5)
units
47kΩ Through Hole 1 Side Adjust 0.15W CB10 Pin 9.8mm ±20% - ±500ppm/°C - - -
RS Stock No. 652-4518
Mfr. Part No.416XA203P
MYR2.591
Each (In a Pack of 10)
units
20kΩ Through Hole 1 Side Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -