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. 474-6996
Mfr. Part No.CT-6EP 10k Ohm
$1.638
Each (In a Pack of 5)
units
10 kΩ Through Hole 1 Top Adjust 0.5W CT-6 Pin 7mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-0293
Mfr. Part No.3299W-1-103LF
BrandBourns
$5.73
Each
units
10 kΩ Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-0265
Mfr. Part No.3299W-1-101LF
BrandBourns
$5.73
Each
units
100 Ω Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 769-2167
Mfr. Part No.PV36W103C01B00
BrandBourns
$2.37
Each
units
10 kΩ Through Hole 25 Top Adjust 0.5W PV36 Solder Pin 9.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 161-7068
Mfr. Part No.3299W-1-101LF
BrandBourns
$4.23
Each (In a Tube of 50)
units
100 Ω Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±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. 167-3337
Mfr. Part No.3314G-1-103E
BrandBourns
$1.74
Each (On a Reel of 500)
units
10 kΩ Surface Mount 1 Top Adjust 0.25W 3314 Gull Wing 5mm ±20% - ±100ppm/°C - - -
RS Stock No. 521-9041
Mfr. Part No.3006P-1-103LF
BrandBourns
$3.52
Each
units
10 kΩ Through Hole 15 Side Adjust 0.75W 3006 Pin 20.57mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3477
Mfr. Part No.3386P-1-502LF
BrandBourns
$2.08
Each (In a Tube of 50)
units
5 kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°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. 177-481
Mfr. Part No.3224W-1-103E
BrandBourns
$8.47
Each (In a Pack of 5)
units
10 kΩ Surface Mount 12 Top Adjust 0.25W 3224 J-Hook 4.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-5363
Mfr. Part No.3306W-1-203
BrandBourns
$0.477
Each (In a Bag of 200)
units
20 kΩ Through Hole 1 Side Adjust 0.2W 3306 Pin 6.81mm ±25% - ±250ppm/°C - - -
RS Stock No. 167-3623
Mfr. Part No.93R1A-R22-A17L
BrandBourns
$8.33
Each (In a Tray of 45)
units
25 kΩ Panel Mount, Through Hole 1 Side Adjust 2W 93 Pin 34.7mm ±10% - ±150ppm/°C - - -
RS Stock No. 161-6780
Mfr. Part No.3306W-1-202
BrandBourns
$0.477
Each (In a Bag of 200)
units
2 kΩ Through Hole 1 Side Adjust 0.2W 3306 Pin 6.81mm ±25% - ±250ppm/°C - - -
RS Stock No. 100-1177
Mfr. Part No.3314G-1-103E
BrandBourns
$2.65
Each (In a Pack of 10)
units
10 kΩ Surface Mount 1 Top Adjust 0.25W 3314 Gull Wing 5mm ±20% - ±100ppm/°C - - -
RS Stock No. 788-5085
Mfr. Part No.T93YA503KT20
BrandVishay
$2.10
Each (In a Pack of 5)
units
50 kΩ Through Hole 21 Top Adjust 0.5W T93 Pin 9.7mm ±10% - - - - -
RS Stock No. 691-7392
Mfr. Part No.3313S-1-502E
BrandBourns
$3.23
Each
units
5 kΩ Surface Mount 1 Side Adjust 0.125W 3313 J-Hook 3.61mm ±20% - ±100ppm/°C - - -
RS Stock No. 167-3471
Mfr. Part No.3386P-1-104LF
BrandBourns
$2.08
Each (In a Tube of 50)
units
100 kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 474-9305
Mfr. Part No.RJ-13PR 10k Ohm (103)
$9.92
Each
units
10 kΩ Through Hole 1 - 0.75W - Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 167-3531
Mfr. Part No.3224W-1-103E
BrandBourns
$5.54
Each (On a Reel of 250)
units
10 kΩ Surface Mount 12 Top Adjust 0.25W 3224 J-Hook 4.8mm ±10% - ±100ppm/°C - - -
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