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. 896-7156
Mfr. Part No.CT-6EV 200kR
€0.908
Each (In a Bag of 5)
units
200kΩ Through Hole 1 Top Adjust 0.5W CT6 Solder Pin 7mm ±10% - ±100ppm/°C - - 200 V
RS Stock No. 896-7055
Mfr. Part No.ST-4EA 100R
€1.188
Each (In a Bag of 5)
units
100Ω Surface Mount 1 Top Adjust 0.25W ST-4 Solder Pin 5mm ±20% - ±100ppm/°C - - 5 V
RS Stock No. 896-7150
Mfr. Part No.CT-6EV 200R
€0.908
Each (In a Bag of 5)
units
200Ω Through Hole 1 Top Adjust 0.5W CT6 Solder Pin 7mm ±10% - ±100ppm/°C - - 10 V
RS Stock No. 896-7128
Mfr. Part No.ST-32EA 500kR
€1.212
Each (In a Bag of 5)
units
500kΩ Surface Mount 1 Top Adjust 0.125W ST-32 Solder Pin 3.4mm ±20% - ±100ppm/°C - - 200 V
RS Stock No. 896-7125
Mfr. Part No.ST-32EA 2kR
€1.188
Each (In a Bag of 5)
units
2kΩ Surface Mount 1 Top Adjust 0.125W ST-32 Solder Pin 3.4mm ±20% - ±100ppm/°C - - 15.8 V
RS Stock No. 182-5699
Mfr. Part No.SM-42A 100K ohm(104)
€11.97
Each
units
100kΩ Surface Mount 11 Side Adjust 0.25W SM-42 Solder 4.8mm ±10% - ±100ppm/°C - - 158 V
RS Stock No. 896-7087
Mfr. Part No.ST-4EA 50kR
€1.188
Each (In a Bag of 5)
units
50kΩ Surface Mount 1 Top Adjust 0.25W ST-4 Solder Pin 5mm ±20% - ±100ppm/°C - - 112 V
RS Stock No. 896-7147
Mfr. Part No.CT-6EV 100R
€0.908
Each (In a Bag of 5)
units
100Ω Through Hole 1 Top Adjust 0.5W CT6 Solder Pin 7mm ±10% - ±100ppm/°C - - 7.07 V
RS Stock No. 896-7144
Mfr. Part No.CT-6EV 1kR
€0.908
Each (In a Bag of 5)
units
1kΩ Through Hole 1 Top Adjust 0.5W CT6 Solder Pin 7mm ±10% - ±100ppm/°C - - 22.4 V
RS Stock No. 896-7213
Mfr. Part No.CT-6EX 500R
€0.908
Each (In a Bag of 5)
units
500Ω Through Hole 1 Side Adjust 0.5W CT6 Solder Pin 7mm ±10% - ±100ppm/°C - - 15.8 V
RS Stock No. 896-7166
Mfr. Part No.CT-6EV 500kR
€0.908
Each (In a Bag of 5)
units
500kΩ Through Hole 1 Top Adjust 0.5W CT6 Solder Pin 7mm ±10% - ±100ppm/°C - - 200 V
RS Stock No. 896-7112
Mfr. Part No.ST-32EA 200R
€1.188
Each (In a Bag of 5)
units
200Ω Surface Mount 1 Top Adjust 0.125W ST-32 Solder Pin 3.4mm ±20% - ±100ppm/°C - - 5 V
RS Stock No. 896-7116
Mfr. Part No.ST-32EA 20kR
€1.212
Each (In a Bag of 5)
units
20kΩ Surface Mount 1 Top Adjust 0.125W ST-32 Solder Pin 3.4mm ±20% - ±100ppm/°C - - 50 V
RS Stock No. 182-5623
Mfr. Part No.SM-42A 100K ohm(104)
€2.275
Each (In a Bag of 100)
units
100kΩ Surface Mount 11 Side Adjust 0.25W SM-42 Solder 4.8mm ±10% - ±100ppm/°C - - 158 V
RS Stock No. 896-7122
Mfr. Part No.ST-32EA 500R
€1.188
Each (In a Bag of 5)
units
500Ω Surface Mount 1 Top Adjust 0.125W ST-32 Solder Pin 3.4mm ±20% - ±100ppm/°C - - 7.91 V
RS Stock No. 896-7162
Mfr. Part No.CT-6EV 2kR
€0.908
Each (In a Bag of 5)
units
2kΩ Through Hole 1 Top Adjust 0.5W CT6 Solder Pin 7mm ±10% - ±100ppm/°C - - 31.6 V
RS Stock No. 896-7061
Mfr. Part No.ST-4EA 1MR
€1.188
Each (In a Bag of 5)
units
1MΩ Surface Mount 1 Top Adjust 0.25W ST-4 Solder Pin 5mm ±20% - ±100ppm/°C - - 200 V
RS Stock No. 896-7175
Mfr. Part No.CT-6EV 500R
€0.908
Each (In a Bag of 5)
units
500Ω Through Hole 1 Top Adjust 0.5W CT6 Solder Pin 7mm ±10% - ±100ppm/°C - - 15.8 V
RS Stock No. 896-7217
Mfr. Part No.CT-6EX 50kR
€0.908
Each (In a Bag of 5)
units
50kΩ Through Hole 1 Side Adjust 0.5W CT6 Solder Pin 7mm ±10% - ±100ppm/°C - - 158 V
RS Stock No. 896-7065
Mfr. Part No.ST-4EA 200kR
€1.212
Each (In a Bag of 5)
units
200kΩ Surface Mount 1 Top Adjust 0.25W ST-4 Solder Pin 5mm ±20% - ±100ppm/°C - - 200 V