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. 521-9782
Mfr. Part No.3296W-1-501LF
BrandBourns
HK$20.21
Each
units
500 Ω Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9653
Mfr. Part No.3296W-1-104LF
BrandBourns
HK$24.07
Each
units
100 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3501
Mfr. Part No.3296W-1-501LF
BrandBourns
HK$15.347
Each (In a Tube of 50)
units
500 Ω Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-9379
Mfr. Part No.T7YB103MT20
BrandVishay
HK$10.99
Each (In a Tube of 50)
units
10 kΩ Through Hole 1 Top Adjust 0.5W T7 Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 167-9940
Mfr. Part No.T93XA102KT20
BrandVishay
HK$11.829
Each (In a Tube of 50)
units
1 kΩ Through Hole 21 Side Adjust 0.5W T93 Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 169-3081
Mfr. Part No.M64W503KB40
BrandVishay
HK$16.101
Each (In a Box of 200)
units
50 kΩ Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 0.5W 64W Pin 9.7mm ±10% - - - - -
RS Stock No. 652-4697
Mfr. Part No.409VA103M
HK$5.48
Each
units
10 kΩ Through Hole 1 Side Adjust 0.5W 409 Pin 9mm ±20% - ±250ppm/°C - - -
RS Stock No. 769-2195
Mfr. Part No.PV36W503C01B00
BrandBourns
HK$12.79
Each
units
50 kΩ Through Hole 25 Top Adjust 0.5W PV36 Solder Pin 9.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3238
Mfr. Part No.3006P-1-201LF
BrandBourns
HK$13.75
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. 168-0257
Mfr. Part No.409VA103M
HK$3.744
Each (On a Reel of 1000)
units
10 kΩ Through Hole 1 Side Adjust 0.5W 409 Pin 9mm ±20% - ±250ppm/°C - - -
RS Stock No. 743-2252
Mfr. Part No.3006P-7-103LF
BrandBourns
HK$27.25
Each
units
10 kΩ Through Hole 15 Side Adjust 0.75W 3006 Pin 19.05mm ±10% - ±100ppm/°C - - -
RS Stock No. 619-7778
Mfr. Part No.SV01A103AEA01B00
BrandMurata
HK$18.79
Each
units
10 kΩ Surface Mount - Top Adjust - SV01 Gull Wing 11mm ±30% - ±500ppm/°C - - -
RS Stock No. 277-0212
Mfr. Part No.M43P103KB30T601
BrandVishay
HK$25.87
Each
units
10 kΩ Panel Mount, Through Hole 20 Side Adjust 0.5W 43P Pin 27.81mm ±10% - ±100ppm/°C - - -
RS Stock No. 850-9693
Mfr. Part No.T7YB103KT20
BrandVishay
HK$25.58
Each
units
10 kΩ Through Hole - Top Adjust 0.5W T7 PC Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 167-3494
Mfr. Part No.3296P-1-503LF
BrandBourns
HK$15.347
Each (In a Tube of 50)
units
50 kΩ Through Hole 25 Side Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-2744
Mfr. Part No.3386P-1-203LF
BrandBourns
HK$13.42
Each
units
20 kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 161-7067
Mfr. Part No.3296Y-1-505LF
BrandBourns
HK$15.347
Each (In a Tube of 50)
units
5 MΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 763-7157
Mfr. Part No.Y405310K0000J0L
HK$239.40
Each
units
10 kΩ Through Hole 21 Top Adjust 0.25W 1240 Solder Pin 6.35mm ±5% - ±10ppm/°C - - -
RS Stock No. 521-9041
Mfr. Part No.3006P-1-103LF
BrandBourns
HK$17.73
Each
units
10 kΩ Through Hole 15 Side Adjust 0.75W 3006 Pin 20.57mm ±10% - ±100ppm/°C - - -
RS Stock No. 154-2404
Mfr. Part No.M64Y202KB40
BrandVishay
HK$18.03
Each
units
2 kΩ Through Hole 21 (Electrical), 23 (Mechanical) Top Adjust 1/2W 64Y Pin 9.7mm ±10% 5mm ±100ppm/°C 11.1mm 9.7 x 5 x 11.1mm -
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