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. 743-2417
Mfr. Part No.3361P-1-502GLF
BrandBourns
€1.21
Each
units
5kΩ Surface Mount 1 Top Adjust 0.5W 3361 Pin 6.71mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3563
Mfr. Part No.3314J-2-204E
BrandBourns
€0.827
Each (On a Reel of 500)
units
200kΩ Surface Mount 1 Top Adjust 0.25W 3314 J-Hook 4.5mm ±20% - ±100ppm/°C - - -
RS Stock No. 785-9865
Mfr. Part No.3296Z-1-503LF
BrandBourns
€2.08
Each
units
50kΩ Through Hole 25 Side Adjust 0.5W 3296 Solder Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 619-7790
Mfr. Part No.SV01L103AEA11T00
BrandMurata
€1.65
Each
units
10kΩ Through Hole - Top Adjust - SV01 Pin 11mm ±30% - ±500ppm/°C - - -
RS Stock No. 754-2122
Mfr. Part No.3203X203P
€2.28
Each
units
20kΩ Surface Mount 1 Top Adjust 0.05W 3203 Tab 3.4mm ±20% - ±100ppm/°C - - -
RS Stock No. 796-4844
Mfr. Part No.3329H-1-471LF
BrandBourns
€0.60
Each
units
470Ω Through Hole 1 Top Adjust 0.5W 3329 Solder Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 167-9367
Mfr. Part No.T7YA223MT20
BrandVishay
€0.876
Each (In a Tube of 50)
units
22kΩ Through Hole 1 Top Adjust 0.5W T7 Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 167-5281
Mfr. Part No.3314G-2-203E
BrandBourns
€0.775
Each (On a Reel of 500)
units
20kΩ Surface Mount 1 Top Adjust 0.25W 3314 Gull Wing 5mm ±20% - ±100ppm/°C - - -
RS Stock No. 154-1962
Mfr. Part No.M64W100KB40
BrandVishay
€0.79
Each
units
10Ω Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 1/2W 64W Pin 9.7mm ±10% 5mm 0 → +200ppm/°C 11.1mm 9.7 x 5 x 11.1mm -
RS Stock No. 748-1355
Mfr. Part No.3306W-1-502
BrandBourns
€0.144
Each (In a Pack of 10)
units
5kΩ Through Hole 1 Side Adjust 0.2W 3306 Pin 6.81mm ±25% - ±250ppm/°C - - -
RS Stock No. 522-0013
Mfr. Part No.3296X-1-504LF
BrandBourns
€2.03
Each
units
500kΩ Through Hole 25 Side Adjust 0.5W 3296 Pin 11.05mm ±10% - ±100ppm/°C - - -
RS Stock No. 169-3103
Mfr. Part No.M64Y502KB40
BrandVishay
€1.245
Each (In a Box of 200)
units
5kΩ Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 0.5W 64Y Pin 9.7mm ±10% - - - - -
RS Stock No. 166-9923
Mfr. Part No.3224J-1-101E
BrandBourns
€2.781
Each (On a Reel of 500)
units
100Ω Surface Mount 12 Side Adjust 0.25W 3224 J-Hook 4.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-0112
Mfr. Part No.3224X-1-202E
BrandBourns
€2.297
Each (On a Reel of 200)
units
2kΩ Surface Mount 12 Top Adjust 0.25W 3224 Gull Wing 4.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 796-4951
Mfr. Part No.3214J-1-202E
BrandBourns
€3.44
Each
units
2kΩ Surface Mount 5 Side Adjust 0.25W 3214 J-Hook 4.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-9377
Mfr. Part No.T7YB222MT20
BrandVishay
€0.781
Each (In a Tube of 50)
units
2.2kΩ Through Hole 1 Top Adjust 0.5W T7 Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 162-2564
Mfr. Part No.3266X-1-101LF
BrandBourns
€1.062
Each (In a Tube of 50)
units
100Ω Through Hole 12 Side Adjust 0.25W 3266 Pin 7.73mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3437
Mfr. Part No.3386G-1-105LF
BrandBourns
€1.019
Each (In a Tube of 50)
units
1MΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 743-2293
Mfr. Part No.3224J-1-501E
BrandBourns
€4.33
Each
units
500Ω Surface Mount 12 Side Adjust 0.25W 3224 J-Hook 4.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 374-6793
Mfr. Part No.T7YA223MT20
BrandVishay
€1.686
Each (In a Pack of 5)
units
22kΩ Through Hole 1 Top Adjust 0.5W T7 Pin - ±10% - ±100ppm/°C - - -
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