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. 144-2098
Mfr. Part No.89PR20KLFTB
HK$8.232
Each (In a Tube of 25)
units
20 kΩ Through Hole 20 Side Adjust 0.75W 89 Solder Pin 19.05mm ±10% - ±100ppm/°C - - 200 V dc
RS Stock No. 144-2195
Mfr. Part No.64YR50KLF
HK$19.43
Each (In a Pack of 5)
units
50 kΩ Through Hole 12 Top Adjust 0.25 W @ 85 °C 64 Solder Pin 6.35mm ±10% - ±100ppm/°C - - 200 V dc
RS Stock No. 144-2231
Mfr. Part No.89PR1MEGLFTB
HK$12.782
Each (In a Pack of 5)
units
1 MΩ Through Hole 20 Side Adjust 0.75W 89 Solder Pin 19.05mm ±10% - ±100ppm/°C - - 200 V dc
RS Stock No. 144-2099
Mfr. Part No.64YR2KLF
HK$14.685
Each (In a Tube of 50)
units
2 kΩ Through Hole 12 Top Adjust 0.25 W @ 85 °C 64 Solder Pin 6.35mm ±10% - ±100ppm/°C - - 200 V dc
RS Stock No. 144-2184
Mfr. Part No.64YR10KLF
HK$19.43
Each (In a Pack of 5)
units
10 kΩ Through Hole 12 Top Adjust 0.25 W @ 85 °C 64 Solder Pin 6.35mm ±10% - ±100ppm/°C - - 200 V dc
RS Stock No. 144-2109
Mfr. Part No.64YR50KLF
HK$14.685
Each (In a Tube of 50)
units
50 kΩ Through Hole 12 Top Adjust 0.25 W @ 85 °C 64 Solder Pin 6.35mm ±10% - ±100ppm/°C - - 200 V dc
RS Stock No. 144-2069
Mfr. Part No.89PR500LFTB
HK$8.232
Each (In a Tube of 25)
units
500 Ω Through Hole 20 Side Adjust 0.75W 89 Solder Pin 19.05mm ±10% - ±100ppm/°C - - 200 V dc
RS Stock No. 144-2102
Mfr. Part No.44WR20KLFT7
HK$20.065
Each (On a Reel of 250)
units
20 kΩ Surface Mount 9 Top Adjust 0.25 W @ 85 °C 44 Solder Pin 4.83mm ±10% - ±100ppm/°C - - 300 V dc
RS Stock No. 144-2208
Mfr. Part No.64WR100LF
HK$16.88
Each (In a Pack of 5)
units
100 Ω Through Hole 12 Top Adjust 0.25 W @ 85 °C 64 Solder Pin 6.35mm ±10% - ±100ppm/°C - - 200 V dc
RS Stock No. 144-2196
Mfr. Part No.44WR5KLFT7
HK$32.13
Each
units
5 kΩ Surface Mount 9 Top Adjust 0.25 W @ 85 °C 44 Solder Pin 4.83mm ±10% - ±100ppm/°C - - 300 V dc
RS Stock No. 144-2232
Mfr. Part No.67PR10KLF
HK$13.64
Each (In a Pack of 5)
units
10 kΩ Through Hole 20 Side Adjust 0.5W 67 Solder Pin 9.53mm ±10% - ±100ppm/°C - - 200 V dc
RS Stock No. 144-2238
Mfr. Part No.89PR200KLFTB
HK$13.422
Each (In a Pack of 5)
units
200 kΩ Through Hole 20 Side Adjust 0.75W 89 Solder Pin 19.05mm ±10% - ±100ppm/°C - - 200 V dc
RS Stock No. 144-2250
Mfr. Part No.89PR20KLFTB
HK$12.782
Each (In a Pack of 5)
units
20 kΩ Through Hole 20 Side Adjust 0.75W 89 Solder Pin 19.05mm ±10% - ±100ppm/°C - - 200 V dc
RS Stock No. 144-2199
Mfr. Part No.64WR2KLF
HK$16.88
Each (In a Pack of 5)
units
2 kΩ Through Hole 12 Top Adjust 0.25 W @ 85 °C 64 Solder Pin 6.35mm ±10% - ±100ppm/°C - - 200 V dc
RS Stock No. 144-2225
Mfr. Part No.82PR100KLFTB
HK$9.034
Each (In a Pack of 5)
units
100 kΩ Through Hole 1 Top Adjust 0.5W 82 Solder Pin - ±10% - ±100ppm/°C - - 200 V dc
RS Stock No. 144-2185
Mfr. Part No.82PR10KLFTB
HK$10.39
Each (In a Pack of 5)
units
10 kΩ Through Hole 1 Top Adjust 0.5W 82 Solder Pin - ±10% - ±100ppm/°C - - 200 V dc
RS Stock No. 144-2186
Mfr. Part No.89PR500LFTB
HK$12.782
Each (In a Pack of 5)
units
500 Ω Through Hole 20 Side Adjust 0.75W 89 Solder Pin 19.05mm ±10% - ±100ppm/°C - - 200 V dc
RS Stock No. 144-2181
Mfr. Part No.64WR1KLF
HK$16.88
Each (In a Pack of 5)
units
1 kΩ Through Hole 12 Top Adjust 0.25 W @ 85 °C 64 Solder Pin 6.35mm ±10% - ±100ppm/°C - - 200 V dc
RS Stock No. 144-2111
Mfr. Part No.67PR20KLF
HK$10.403
Each (In a Box of 50)
units
20 kΩ Through Hole 20 Side Adjust 0.5W 67 Solder Pin 9.53mm ±10% - ±100ppm/°C - - 200 V dc
RS Stock No. 144-2117
Mfr. Part No.89PR1MEGLFTB
HK$9.563
Each (In a Tube of 25)
units
1 MΩ Through Hole 20 Side Adjust 0.75W 89 Solder Pin 19.05mm ±10% - ±100ppm/°C - - 200 V dc