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. 521-9805
Mfr. Part No.3296W-1-503LF
BrandBourns
€1.94
Each
units
50 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 183-1209
Mfr. Part No.M63M202KB30T607
BrandVishay
€3.33
Each
units
2 kΩ Through Hole 1 Finger Adjust 1/2W 63M-T607 Pin 9.52mm ±10% 9.52mm ±100ppm/°C 10.41mm 9.52 x 9.52 x 10.41mm -
RS Stock No. 167-3259
Mfr. Part No.3362P-1-203LF
BrandBourns
€0.653
Each (In a Tube of 50)
units
20 kΩ Through Hole 1 Top Adjust 0.5W 3362 Pin 6.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-0300
Mfr. Part No.3299W-1-104LF
BrandBourns
€2.85
Each
units
100 kΩ Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 100-1240
Mfr. Part No.3314G-1-105E
BrandBourns
€1.218
Each (In a Pack of 10)
units
1 MΩ Surface Mount 1 Top Adjust 0.25W 3314 Gull Wing 5mm ±20% - ±100ppm/°C - - -
RS Stock No. 522-2328
Mfr. Part No.3386F-1-202TLF
BrandBourns
€2.15
Each
units
2 kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 743-2306
Mfr. Part No.3224X-1-103E
BrandBourns
€4.33
Each
units
10 kΩ Surface Mount 12 Top Adjust 0.25W 3224 Pin 3.5mm ±10% - ±100ppm/°C - - -
RS Stock No. 161-7054
Mfr. Part No.3006P-1-223LF
BrandBourns
€0.54
Each (In a Tube of 25)
units
22 kΩ Through Hole 15 Side Adjust 0.75W 3006 Pin 20.57mm ±10% - ±100ppm/°C - - -
RS Stock No. 691-7418
Mfr. Part No.3314J-1-501E
BrandBourns
€1.76
Each (In a Pack of 5)
units
500 Ω Surface Mount 1 Top Adjust 0.25W 3314 J-Hook 4.5mm ±20% - ±100ppm/°C - - -
RS Stock No. 169-2933
Mfr. Part No.SV01A103AEA01B00
BrandMurata
€1.131
Each (In a Bag of 50)
units
10 kΩ Surface Mount - Top Adjust - SV01 Gull Wing 11mm ±30% - ±500ppm/°C - - -
RS Stock No. 522-2542
Mfr. Part No.3386H-1-102LF
BrandBourns
€1.40
Each
units
1 kΩ Through Hole 1 Side Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-0726
Mfr. Part No.3329H-1-102LF
BrandBourns
€2.77
Each
units
1 kΩ Through Hole 1 Top Adjust 0.5W 3329 Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 167-3444
Mfr. Part No.3386H-1-102LF
BrandBourns
€1.03
Each (In a Tube of 50)
units
1 kΩ Through Hole 1 Side Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3547
Mfr. Part No.3214W-1-503E
BrandBourns
€1.761
Each (On a Reel of 250)
units
50 kΩ Surface Mount 5 Top Adjust 0.25W 3214 J-Hook 4.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9710
Mfr. Part No.3296W-1-203LF
BrandBourns
€2.05
Each
units
20 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 796-4995
Mfr. Part No.3299P-1-103LF
BrandBourns
€1.36
Each
units
10 kΩ Through Hole 25 Side Adjust 0.5W 3299 Solder Pin 10.03mm ±10% - ±100ppm/°C - - -
RS Stock No. 787-0752
Mfr. Part No.3006P-1-253LF
BrandBourns
€1.81
Each
units
25 kΩ Through Hole 15 Side Adjust 0.75W 3006 Pin 20.57mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-5244
Mfr. Part No.3386X-1-102LF
BrandBourns
€1.03
Each (In a Tube of 50)
units
1 kΩ Through Hole 1 Side Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3238
Mfr. Part No.3006P-1-201LF
BrandBourns
€1.384
Each (In a Tube of 25)
units
200 Ω Through Hole 15 Side Adjust 0.75W 3006 Pin 20.57mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-5203
Mfr. Part No.3006P-7-103LF
BrandBourns
€1.694
Each (In a Tube of 25)
units
10 kΩ Through Hole 15 Side Adjust 0.75W 3006 Pin 19.05mm ±10% - ±100ppm/°C - - -
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