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. 522-2693
Mfr. Part No.3386P-1-103LF
BrandBourns
$2.79
Each
units
10kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 168-0375
Mfr. Part No.416XA204P
$0.754
Each (On a Reel of 1000)
units
200kΩ Through Hole 1 Side Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 488-5300
Mfr. Part No.3306P-1-102
BrandBourns
$0.605
Each (In a Pack of 10)
units
1kΩ Through Hole 1 Top Adjust 0.2W 3306 Pin 6.81mm ±25% - ±250ppm/°C - - -
RS Stock No. 162-2386
Mfr. Part No.M70Y202KB25
BrandVishay
$19.338
Each (In a Box of 50)
units
2kΩ Through Hole 20 Side Adjust 0.5W 70Y Pin 33.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3244
Mfr. Part No.3006P-1-504LF
BrandBourns
$2.761
Each (In a Tube of 25)
units
500kΩ Through Hole 15 Side Adjust 0.75W 3006 Pin 20.57mm ±10% - ±100ppm/°C - - -
RS Stock No. 474-7703
Mfr. Part No.CT-94EX 5k Ohm
$6.13
Each
units
5kΩ Through Hole 18 Side Adjust 0.5W CT-94 Pin 9.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 163-9530
Mfr. Part No.416MA501P
$0.876
Each (In a Box of 500)
units
500Ω Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 154-2410
Mfr. Part No.M64Y502KB40
BrandVishay
$4.98
Each
units
5kΩ Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 1/2W 64Y Pin 9.7mm ±10% 5mm - 11.1mm 9.7 x 5 x 11.1mm -
RS Stock No. 167-3347
Mfr. Part No.3306P-1-103
BrandBourns
$0.544
Each (In a Bag of 200)
units
10kΩ Through Hole 1 Top Adjust 0.2W 3306 Pin 6.81mm ±25% - ±250ppm/°C - - -
RS Stock No. 154-2533
Mfr. Part No.M63M502KB30T607
BrandVishay
$3.74
Each
units
5kΩ 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. 169-3103
Mfr. Part No.M64Y502KB40
BrandVishay
$3.19
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. 167-3493
Mfr. Part No.3266X-1-202LF
BrandBourns
$5.148
Each (In a Tube of 50)
units
2kΩ Through Hole 12 Side Adjust 0.25W 3266 Pin 7.73mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-9367
Mfr. Part No.T7YA223MT20
BrandVishay
$1.905
Each (In a Tube of 50)
units
22kΩ Through Hole 1 Top Adjust 0.5W T7 Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 474-9254
Mfr. Part No.RJ-13PR 500 Ohm (501)
$11.81
Each
units
500Ω Through Hole 1 - 0.75W - Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 167-9656
Mfr. Part No.M63M102KB30T607
BrandVishay
$5.159
Each (In a Box of 400)
units
1kΩ Through Hole 1 Top Adjust 0.5W 63M Pin 9.52mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-0085
Mfr. Part No.3296Y-1-104LF
BrandBourns
$4.98
Each
units
100kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-5349
Mfr. Part No.93R1A-R22-A22L
BrandBourns
$10.24
Each
units
250kΩ Panel Mount, Through Hole 1 Side Adjust 2W 93 Pin 34.7mm ±10% - ±150ppm/°C - - -
RS Stock No. 522-0215
Mfr. Part No.3296Y-1-502LF
BrandBourns
$5.01
Each
units
5kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-2889
Mfr. Part No.3386W-1-203LF
BrandBourns
$2.79
Each
units
20kΩ Through Hole 1 Side Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3504
Mfr. Part No.3296Y-1-502LF
BrandBourns
$3.784
Each (In a Tube of 50)
units
5kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -