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. 172-8307
Mfr. Part No.PC910 220R RS
$17.446
Each (In a Box of 300)
units
- Through Hole 1 Top Adjust 1W PC910 Pin - ±20% - - - - -
RS Stock No. 186-132
Mfr. Part No.PC910 220R RS
$21.57
Each
units
220 Ω Through Hole 1 Top Adjust 1W PC910 Pin - ±20% - - - - -
RS Stock No. 168-0375
Mfr. Part No.416XA204P
$0.757
Each (On a Reel of 1000)
units
200 kΩ Through Hole 1 Side Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 172-8308
Mfr. Part No.PC910 470R RS
$13.835
Each (In a Box of 300)
units
- Through Hole 1 Top Adjust 1W PC910 Pin - ±20% - - - - -
RS Stock No. 652-4439
Mfr. Part No.416XA204P
$1.11
Each (In a Pack of 10)
units
200 kΩ Through Hole 1 Side Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 186-148
Mfr. Part No.PC910 470R RS
$21.20
Each
units
470 Ω Through Hole 1 Top Adjust 1W PC910 Pin - ±20% - - - - -
RS Stock No. 652-4388
Mfr. Part No.416XA101P
$1.16
Each (In a Pack of 10)
units
100 Ω Through Hole 1 Side Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 168-0374
Mfr. Part No.416XA101P
$0.747
Each (On a Reel of 1000)
units
100 Ω Through Hole 1 Side Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 652-4215
Mfr. Part No.416MA501P
$1.07
Each (In a Pack of 10)
units
500 Ω Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 163-9530
Mfr. Part No.416MA501P
$0.88
Each (In a Box of 500)
units
500 Ω Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 652-4372
Mfr. Part No.416PA502M
$1.172
Each (In a Pack of 10)
units
5 kΩ Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±20% - ±250ppm/°C - - -
RS Stock No. 473-578
Mfr. Part No.CB10LV105M
$0.458
Each (In a Pack of 5)
units
1 MΩ Through Hole 1 Top Adjust 0.15W CB10 Pin 11mm ±20% - - - - -
RS Stock No. 161-5461
Mfr. Part No.416PA102M
$0.922
Each (In a Bag of 500)
units
1 kΩ Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±20% - ±250ppm/°C - - -
RS Stock No. 163-8560
Mfr. Part No.PC910 4K7 RS
$15.877
Each (In a Box of 100)
units
4.7 kΩ Through Hole 1 Top Adjust 1W PC910 Pin - ±20% - - - - -
RS Stock No. 161-9911
Mfr. Part No.416MA102P
$0.503
Each (In a Bag of 500)
units
1 kΩ Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 162-1634
Mfr. Part No.CB10LV105M
$0.304
Each (In a Box of 1000)
units
1 MΩ Through Hole 1 Top Adjust 0.15W CB10 Pin 11mm ±20% - - - - -
RS Stock No. 162-1633
Mfr. Part No.CB10LV471M
$0.432
Each (In a Box of 1000)
units
470 Ω Through Hole 1 Top Adjust 0.15W CB10 Pin 11mm ±20% - ±500ppm/°C - - -
RS Stock No. 652-4287
Mfr. Part No.416PA102M
$1.10
Each (In a Pack of 10)
units
1 kΩ Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±20% - ±250ppm/°C - - -
RS Stock No. 652-4164
Mfr. Part No.416MA102P
$0.558
Each (In a Pack of 10)
units
1 kΩ Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 186-176
Mfr. Part No.PC910 4K7 RS
$19.52
Each
units
4.7 kΩ Through Hole 1 Top Adjust 1W PC910 Pin - ±20% - - - - -