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. 522-2700
Mfr. Part No.3386P-1-104LF
BrandBourns
$2.70
Each
units
100 kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-9951
Mfr. Part No.T93YA503KT20
BrandVishay
$1.76
Each (In a Tube of 50)
units
50 kΩ Through Hole 21 Top Adjust 0.5W T93 Pin 9.7mm ±10% - - - - -
RS Stock No. 167-4404
Mfr. Part No.3313S-1-502E
BrandBourns
$2.59
Each (On a Reel of 200)
units
5 kΩ Surface Mount 1 Side Adjust 0.125W 3313 J-Hook 3.61mm ±20% - ±100ppm/°C - - -
RS Stock No. 167-3236
Mfr. Part No.3006P-1-103LF
BrandBourns
$2.59
Each (In a Tube of 25)
units
10 kΩ Through Hole 15 Side Adjust 0.75W 3006 Pin 20.57mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-5311
Mfr. Part No.93R1A-R22-A17L
BrandBourns
$10.60
Each
units
25 kΩ Panel Mount, Through Hole 1 Side Adjust 2W 93 Pin 34.7mm ±10% - ±150ppm/°C - - -
RS Stock No. 521-9631
Mfr. Part No.3296W-1-102LF
BrandBourns
$4.85
Each
units
1 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 691-7409
Mfr. Part No.3314J-1-103E
BrandBourns
$3.52
Each (In a Pack of 5)
units
10 kΩ Surface Mount 1 Top Adjust 0.25W 3314 J-Hook 4.5mm ±20% - ±100ppm/°C - - -
RS Stock No. 167-3376
Mfr. Part No.3296W-1-102LF
BrandBourns
$3.68
Each (In a Tube of 50)
units
1 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 748-1342
Mfr. Part No.3306W-1-203
BrandBourns
$0.608
Each (In a Pack of 10)
units
20 kΩ Through Hole 1 Side Adjust 0.2W 3306 Pin 6.81mm ±25% - ±250ppm/°C - - -
RS Stock No. 522-2772
Mfr. Part No.3386P-1-502LF
BrandBourns
$2.70
Each
units
5 kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 294-3577
Mfr. Part No.M43P203KB30T601
BrandVishay
$7.28
Each
units
20 kΩ Panel Mount, Through Hole 20 Side Adjust 0.5W 43P Pin 27.81mm ±10% - ±100ppm/°C - - -
RS Stock No. 163-8560
Mfr. Part No.PC910 4K7 RS
$11.518
Each (In a Box of 100)
units
4.7 kΩ Through Hole 1 Top Adjust 1W PC910 Pin - ±20% - - - - -
RS Stock No. 167-3470
Mfr. Part No.3386P-1-103LF
BrandBourns
$2.08
Each (In a Tube of 50)
units
10 kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 169-3082
Mfr. Part No.M64W104KB40
BrandVishay
$3.92
Each (In a Box of 200)
units
100 kΩ Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 0.5W 64W Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 154-2072
Mfr. Part No.M64W104KB40
BrandVishay
$4.93
Each
units
100 kΩ Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 1/2W 64W Pin 9.7mm ±10% 5mm ±100ppm/°C 11.1mm 9.7 x 5 x 11.1mm -
RS Stock No. 167-5408
Mfr. Part No.3306F-1-103
BrandBourns
$0.477
Each (In a Bag of 200)
units
10 kΩ Through Hole 1 Top Adjust 0.2W 3306 Pin 6.81mm ±25% - ±250ppm/°C - - -
RS Stock No. 169-3076
Mfr. Part No.M64W102KB40
BrandVishay
$3.68
Each (In a Box of 200)
units
1 kΩ Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 0.5W 64W Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 374-6917
Mfr. Part No.T7YB472MT20
BrandVishay
$2.664
Each (In a Pack of 5)
units
4.7 kΩ Through Hole 1 Top Adjust 0.5W T7 Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 743-2448
Mfr. Part No.3386G-1-503LF
BrandBourns
$2.70
Each
units
50 kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 186-176
Mfr. Part No.PC910 4K7 RS
$17.32
Each
units
4.7 kΩ Through Hole 1 Top Adjust 1W PC910 Pin - ±20% - - - - -
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