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. 474-6996
Mfr. Part No.CT-6EP 10k Ohm
SGD2.164
Each (In a Pack of 5)
units
10kΩ Through Hole 1 Top Adjust 0.5W CT-6 Pin 7mm ±10% - ±100ppm/°C - - -
RS Stock No. 474-9276
Mfr. Part No.RJ-13PR 2k Ohm (202)
SGD6.02
Each
units
2kΩ Through Hole 1 - 0.75W - Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 474-7006
Mfr. Part No.CT-6EP 20k Ohm
SGD1.46
Each (In a Pack of 5)
units
20kΩ Through Hole 1 Top Adjust 0.5W CT-6 Pin 7mm ±10% - ±100ppm/°C - - -
RS Stock No. 474-7191
Mfr. Part No.CT-6ES 500k Ohm
SGD1.46
Each (In a Pack of 5)
units
500kΩ Through Hole 1 Side Adjust 0.5W CT-6 Pin 7mm ±10% - ±100ppm/°C - - -
RS Stock No. 474-8150
Mfr. Part No.ST-4EB 10k Ohm
SGD1.80
Each (In a Pack of 5)
units
10kΩ Surface Mount 1 Top Adjust 0.25W ST-4 Gull Wing 5mm ±20% - ±100ppm/°C - - -
RS Stock No. 474-9169
Mfr. Part No.RJ-13S 10k Ohm (103)
SGD4.93
Each
units
10kΩ Through Hole 1 Side Adjust 0.75W RJ-13 Pin 12.5mm ±10% - ±100ppm/°C - - -
RS Stock No. 474-6851
Mfr. Part No.RJ-4EWS 10k Ohm
SGD4.01
Each
units
10kΩ Through Hole 1 Side Adjust 0.5W RJ-4 Pin 5mm ±10% - ±100ppm/°C - - -
RS Stock No. 474-6980
Mfr. Part No.CT-6EP 5k Ohm
SGD1.46
Each (In a Pack of 5)
units
5kΩ Through Hole 1 Top Adjust 0.5W CT-6 Pin 7mm ±10% - ±100ppm/°C - - -
RS Stock No. 474-8712
Mfr. Part No.ST-32EB 5k Ohm
SGD2.678
Each (In a Pack of 5)
units
5kΩ Surface Mount 1 Top Adjust 0.125W ST-32 Gull Wing 3.4mm ±20% - ±100ppm/°C - - -
RS Stock No. 602-4901
Mfr. Part No.SM-42W 500 Ohm
SGD5.994
Each (In a Pack of 5)
units
500Ω Surface Mount 11 Top Adjust 0.25W SM-42 J-Hook 4.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 474-9002
Mfr. Part No.RJ-13P 5k Ohm (502)
SGD4.93
Each
units
5kΩ Through Hole 1 Top Adjust 0.75W RJ-13 Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 474-6867
Mfr. Part No.RJ-4EWS 20k Ohm
SGD5.04
Each
units
20kΩ Through Hole 1 Side Adjust 0.5W RJ-4 Pin 5mm ±10% - ±100ppm/°C - - -
RS Stock No. 474-8144
Mfr. Part No.ST-4EB 5k Ohm
SGD2.126
Each (In a Pack of 5)
units
5kΩ Surface Mount 1 Top Adjust 0.25W ST-4 Gull Wing 5mm ±20% - ±100ppm/°C - - -
RS Stock No. 474-7517
Mfr. Part No.CT-94EW 200 Ohm
SGD1.98
Each
units
200Ω Through Hole 18 Top Adjust 0.5W CT-94 Pin 9.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 602-4692
Mfr. Part No.SM-42B 10k Ohm
SGD5.076
Each (In a Pack of 5)
units
10kΩ Surface Mount 11 Top Adjust 0.25W SM-42 Gull Wing 4.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 474-7854
Mfr. Part No.CT-94EP 5k Ohm
SGD3.44
Each
units
5kΩ Through Hole 18 Side Adjust 0.5W CT-94 Pin 9.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 474-7034
Mfr. Part No.CT-6EP 200k Ohm
SGD1.46
Each (In a Pack of 5)
units
200kΩ Through Hole 1 Top Adjust 0.5W CT-6 Pin 7mm ±10% - ±100ppm/°C - - -
RS Stock No. 474-7028
Mfr. Part No.CT-6EP 100k Ohm
SGD1.46
Each (In a Pack of 5)
units
100kΩ Through Hole 1 Top Adjust 0.5W CT-6 Pin 7mm ±10% - ±100ppm/°C - - -
RS Stock No. 474-7719
Mfr. Part No.CT-94EX 10k Ohm
SGD3.44
Each
units
10kΩ Through Hole 18 Side Adjust 0.5W CT-94 Pin 9.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 475-5956
Mfr. Part No.RJ-13SR 100k Ohm (104)
SGD7.53
Each
units
100kΩ Through Hole 1 Side Adjust 0.75W RJ-13 Pin 12.5mm ±10% - ±100ppm/°C - - -