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. 522-0293
Mfr. Part No.3299W-1-103LF
BrandBourns
MYR13.87
Each
units
10kΩ Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3388
Mfr. Part No.3299W-1-103LF
BrandBourns
MYR9.476
Each (In a Tube of 50)
units
10kΩ Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3399
Mfr. Part No.3296Y-1-100LF
BrandBourns
MYR7.20
Each (In a Tube of 50)
units
10Ω Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-0035
Mfr. Part No.3296Y-1-100LF
BrandBourns
MYR7.30
Each
units
10Ω Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9619
Mfr. Part No.3296W-1-100LF
BrandBourns
MYR6.53
Each
units
10Ω Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3368
Mfr. Part No.3296W-1-100LF
BrandBourns
MYR6.87
Each (In a Tube of 50)
units
10Ω Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3378
Mfr. Part No.3296W-1-104LF
BrandBourns
MYR7.519
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. 788-5069
Mfr. Part No.T93YA101KT20
BrandVishay
MYR6.58
Each (In a Pack of 5)
units
100Ω Through Hole 21 Top Adjust 0.5W T93 Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-9990
Mfr. Part No.T93YA101KT20
BrandVishay
MYR4.652
Each (In a Tube of 50)
units
100Ω Through Hole 21 Top Adjust 0.5W T93 Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 154-2555
Mfr. Part No.M63M104KB30T607
BrandVishay
MYR14.60
Each
units
100kΩ 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. 521-9653
Mfr. Part No.3296W-1-104LF
BrandBourns
MYR9.54
Each
units
100kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-9650
Mfr. Part No.M63M104KB30T607
BrandVishay
MYR10.657
Each (In a Box of 400)
units
100kΩ Through Hole 1 Top Adjust 0.5W 63M Pin 9.52mm ±10% - ±100ppm/°C - - -
RS Stock No. 787-0500
Mfr. Part No.3266W-1-254LF
BrandBourns
MYR19.06
Each
units
250kΩ Through Hole 12 Top Adjust 0.25W 3266 Solder Pin 6.71mm ±10% - ±100ppm/°C - - -
RS Stock No. 743-2350
Mfr. Part No.3306F-1-103
BrandBourns
MYR1.76
Each
units
10kΩ Through Hole 1 Top Adjust 0.2W 3306 Pin 6.81mm ±25% - ±250ppm/°C - - -
RS Stock No. 167-5408
Mfr. Part No.3306F-1-103
BrandBourns
MYR1.28
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. 521-9647
Mfr. Part No.3296W-1-103LF
BrandBourns
MYR9.93
Each
units
10kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3377
Mfr. Part No.3296W-1-103LF
BrandBourns
MYR7.519
Each (In a Tube of 50)
units
10kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3478
Mfr. Part No.3386P-1-503LF
BrandBourns
MYR4.468
Each (In a Tube of 50)
units
50kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3497
Mfr. Part No.3296W-1-101LF
BrandBourns
MYR7.519
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. 522-2788
Mfr. Part No.3386P-1-503LF
BrandBourns
MYR6.54
Each
units
50kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -