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. 168-0257
Mfr. Part No.409VA103M
HK$6.23
Each (On a Reel of 1000)
units
10 kΩ Through Hole 1 Side Adjust 0.5W 409 Pin 9mm ±20% - ±250ppm/°C - - -
RS Stock No. 652-4697
Mfr. Part No.409VA103M
HK$12.49
Each
units
10 kΩ Through Hole 1 Side Adjust 0.5W 409 Pin 9mm ±20% - ±250ppm/°C - - -
RS Stock No. 168-0369
Mfr. Part No.416PA101M
HK$3.34
Each (On a Reel of 1000)
units
100 Ω Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±20% - ±250ppm/°C - - -
RS Stock No. 652-4259
Mfr. Part No.416PA101M
HK$5.19
Each (In a Pack of 10)
units
100 Ω Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±20% - ±250ppm/°C - - -
RS Stock No. 168-0233
Mfr. Part No.409VA501M
HK$8.51
Each (In a Box of 100)
units
500 Ω Through Hole 1 Side Adjust 0.5W 409 Pin 9mm ±20% - ±250ppm/°C - - -
RS Stock No. 500-2770
Mfr. Part No.3204X103P
HK$17.63
Each (In a Pack of 5)
units
10 kΩ Surface Mount 1 Top Adjust 0.1W 3204 J-Hook 5mm ±25% - ±250ppm/°C - - -
RS Stock No. 164-8610
Mfr. Part No.3204X103P
HK$9.33
Each (On a Reel of 500)
units
10 kΩ Surface Mount 1 Top Adjust 0.1W 3204 J-Hook 5mm ±25% - ±250ppm/°C - - -
RS Stock No. 173-5287
Mfr. Part No.CB10V 10M
HK$1.808
Each (In a Box of 4000)
units
10 MΩ Through Hole 1 Top Adjust 0.15W CB10 Pin 9.8mm ±30% - ±500ppm/°C - - -
RS Stock No. 442-3839
Mfr. Part No.CB10V 10M
HK$2.736
Each (In a Pack of 5)
units
10 MΩ Through Hole 1 Top Adjust 0.15W CB10 Pin 9.8mm ±30% - ±500ppm/°C - - -
RS Stock No. 163-8560
Mfr. Part No.PC910 4K7 RS
HK$61.821
Each (In a Box of 100)
units
4.7 kΩ Through Hole 1 Top Adjust 1W PC910 Pin - ±20% - - - - -
RS Stock No. 162-1633
Mfr. Part No.CB10LV471M
HK$2.11
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. 168-0375
Mfr. Part No.416XA204P
HK$3.42
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. 652-4445
Mfr. Part No.416XA503P
HK$5.21
Each (In a Pack of 10)
units
50 kΩ Through Hole 1 Side Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 652-4849
Mfr. Part No.3213X105M
HK$15.40
Each (In a Pack of 5)
units
1 MΩ Surface Mount 1 Top Adjust 0.125W 3213 J-Hook 3.4mm ±20% - ±100ppm/°C - - -
RS Stock No. 168-0952
Mfr. Part No.416MA104P
HK$2.80
Each (On a Reel of 1000)
units
100 kΩ Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 163-9455
Mfr. Part No.3213X501M
HK$10.01
Each (On a Reel of 500)
units
500 Ω Surface Mount 1 Top Adjust 0.125W 3213 J-Hook 3.4mm ±20% - ±100ppm/°C - - -
RS Stock No. 161-4844
Mfr. Part No.CB10LH473M
HK$1.32
Each (In a Box of 500)
units
47 kΩ Through Hole 1 Side Adjust 0.15W CB10 Pin 9.8mm ±20% - ±500ppm/°C - - -
RS Stock No. 652-4782
Mfr. Part No.3213X501M
HK$15.40
Each (In a Pack of 5)
units
500 Ω Surface Mount 1 Top Adjust 1/8W 3213 J-Hook 3.4mm ±20% - ±100ppm/°C - - -
RS Stock No. 186-154
Mfr. Part No.PC910 1K RS
HK$103.68
Each
units
1 kΩ Through Hole 1 Top Adjust 1W PC910 Pin - ±20% - - - - -
RS Stock No. 652-4518
Mfr. Part No.416XA203P
HK$5.21
Each (In a Pack of 10)
units
20 kΩ Through Hole 1 Side Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -