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. 788-4105
Mfr. Part No.PVA2A104A01R00
BrandMurata
TWD8.00
Each
units
100 kΩ Surface Mount 1 - 0.1W PVA2 Solder Pad 2.2mm ±25% - ±250ppm/°C - - -
RS Stock No. 166-9612
Mfr. Part No.SV01A103AEA01R00
BrandMurata
TWD32.70
Each (On a Reel of 1000)
units
10 kΩ Surface Mount - Top Adjust - SV01 Gull Wing 11mm ±30% - ±500ppm/°C - - -
RS Stock No. 332-760
Mfr. Part No.PVG3A502C01
BrandMurata
TWD29.00
Each (In a Pack of 5)
units
5 kΩ Surface Mount 1 - 1/4W - J-Hook 3.6mm ±20% - ±150ppm/°C - - -
RS Stock No. 169-2933
Mfr. Part No.SV01A103AEA01B00
BrandMurata
TWD46.40
Each (In a Bag of 50)
units
10 kΩ Surface Mount - Top Adjust - SV01 Gull Wing 11mm ±30% - ±500ppm/°C - - -
RS Stock No. 725-0075
Mfr. Part No.PVG3G203C01R00
BrandMurata
TWD31.00
Each
units
20 kΩ Surface Mount 1 Top Adjust 1/4W PVG3 Gull Wing 3.6mm ±20% - ±150ppm/°C - - -
RS Stock No. 788-4307
Mfr. Part No.PV12P204A01B00
BrandMurata
TWD237.00
Each
units
200 kΩ Through Hole 4 Top Adjust 0.5W PV12 Solder Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 333-202
Mfr. Part No.PV32R103A01
BrandMurata
TWD103.00
Each (In a Pack of 5)
units
10 kΩ Through Hole 1 - 0.5W - Pin - ±20% - ±100ppm/°C - - -
RS Stock No. 619-7784
Mfr. Part No.SV01A103AEA01R00
BrandMurata
TWD85.00
Each
units
10 kΩ Surface Mount 1 Top Adjust - SV01 Gull Wing 11mm ±30% - ±500ppm/°C - - -
RS Stock No. 788-4293
Mfr. Part No.PVZ3K102E01R00
BrandMurata
TWD45.00
Each
units
1 kΩ Surface Mount 1 Top Adjust 0.1W PVZ3 Gull Wing 3.1mm ±30% - ±500ppm/°C - - -
RS Stock No. 619-7778
Mfr. Part No.SV01A103AEA01B00
BrandMurata
TWD78.00
Each
units
10 kΩ Surface Mount - Top Adjust - SV01 Gull Wing 11mm ±30% - ±500ppm/°C - - -