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. 167-3470
Mfr. Part No.3386P-1-103LF
BrandBourns
$2.08
Each (In a Tube of 50)
units
10kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-5327
Mfr. Part No.PV36W504C01B00
BrandBourns
$1.91
Each (In a Tube of 50)
units
500kΩ Through Hole 25 Top Adjust 0.5W PV36 Solder Pin 9.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 163-8560
Mfr. Part No.PC910 4K7 RS
$11.518
Each (In a Box of 100)
units
4.7kΩ Through Hole 1 Top Adjust 1W PC910 Pin - ±20% - - - - -
RS Stock No. 154-2022
Mfr. Part No.M64W102KB40
BrandVishay
$4.65
Each
units
1kΩ 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. 375-562
Mfr. Part No.3386X-1-103LF
BrandBourns
$2.70
Each
units
10kΩ Through Hole 1 Side 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
4.7kΩ Through Hole 1 Top Adjust 1W PC910 Pin - ±20% - - - - -
RS Stock No. 294-3577
Mfr. Part No.M43P203KB30T601
BrandVishay
$7.28
Each
units
20kΩ Panel Mount, Through Hole 20 Side Adjust 0.5W 43P Pin 27.81mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3497
Mfr. Part No.3296W-1-101LF
BrandBourns
$3.68
Each (In a Tube of 50)
units
100Ω Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-2693
Mfr. Part No.3386P-1-103LF
BrandBourns
$2.70
Each
units
10kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 154-2072
Mfr. Part No.M64W104KB40
BrandVishay
$4.93
Each
units
100kΩ 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. 167-3378
Mfr. Part No.3296W-1-104LF
BrandBourns
$3.68
Each (In a Tube of 50)
units
100kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 850-9643
Mfr. Part No.T73YE103KT20
BrandVishay
$1.25
Each
units
10kΩ Through Hole 1 Top Adjust 0.5W T73 PC Pin 6.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-9954
Mfr. Part No.T93YA104KT20
BrandVishay
$2.35
Each (In a Tube of 50)
units
100kΩ Through Hole 21 Top Adjust 0.5W T93 Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-0316
Mfr. Part No.3299W-1-200LF
BrandBourns
$5.73
Each
units
20Ω Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 277-0183
Mfr. Part No.M43P102KB30T601
BrandVishay
$8.54
Each
units
1kΩ Panel Mount, Through Hole 20 Side Adjust 0.5W 43P Pin 27.81mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9625
Mfr. Part No.3296W-1-101LF
BrandBourns
$4.85
Each
units
100Ω Through Hole 25 Top Adjust 0.5W 3296 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
100kΩ Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 0.5W 64W Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 788-5094
Mfr. Part No.T93YA104KT20
BrandVishay
$2.81
Each (In a Pack of 5)
units
100kΩ Through Hole 21 Top Adjust 0.5W T93 Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3469
Mfr. Part No.3386P-1-102LF
BrandBourns
$2.08
Each (In a Tube of 50)
units
1kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 374-6917
Mfr. Part No.T7YB472MT20
BrandVishay
$2.664
Each (In a Pack of 5)
units
4.7kΩ Through Hole 1 Top Adjust 0.5W T7 Pin - ±10% - ±100ppm/°C - - -
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