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. 850-9659
Mfr. Part No.T73YP102KT20
BrandVishay
$1.25
Each
units
1kΩ Through Hole 1 Top Adjust 0.5W T73 PC Pin 6.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 186-031
Mfr. Part No.M70Y202KB25
BrandVishay
$27.96
Each
units
2kΩ Through Hole 20 Side Adjust 0.5W 70Y Pin 33.53mm ±10% - ±100ppm/°C - - -
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. 521-9158
Mfr. Part No.3006P-1-504LF
BrandBourns
$3.50
Each
units
500kΩ Through Hole 15 Side Adjust 0.75W 3006 Pin 20.57mm ±10% - ±100ppm/°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. 521-9221
Mfr. Part No.3266W-1-201LF
BrandBourns
$7.00
Each
units
200Ω Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
RS Stock No. 168-0375
Mfr. Part No.416XA204P
$0.673
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. 177-302
Mfr. Part No.3314J-2-201E
BrandBourns
$3.498
Each (In a Pack of 5)
units
200Ω Surface Mount 1 Top Adjust 0.25W 3314 J-Hook 4.5mm ±20% - ±100ppm/°C - - -
RS Stock No. 474-6980
Mfr. Part No.CT-6EP 5k Ohm
$2.112
Each (In a Pack of 5)
units
5kΩ Through Hole 1 Top Adjust 0.5W CT-6 Pin 7mm ±10% - ±100ppm/°C - - -
RS Stock No. 186-148
Mfr. Part No.PC910 470R RS
$21.20
Each
units
470Ω Through Hole 1 Top Adjust 1W PC910 Pin - ±20% - - - - -
RS Stock No. 167-5239
Mfr. Part No.3386G-1-101LF
BrandBourns
$2.16
Each (In a Tube of 50)
units
100Ω Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 172-8308
Mfr. Part No.PC910 470R RS
$17.851
Each (In a Box of 300)
units
- Through Hole 1 Top Adjust 1W PC910 Pin - ±20% - - - - -
RS Stock No. 522-2334
Mfr. Part No.3386F-1-203LF
BrandBourns
$2.79
Each
units
20kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3556
Mfr. Part No.3314J-2-201E
BrandBourns
$1.914
Each (On a Reel of 500)
units
200Ω Surface Mount 1 Top Adjust 0.25W 3314 J-Hook 4.5mm ±20% - ±100ppm/°C - - -
RS Stock No. 521-9344
Mfr. Part No.3266X-1-104LF
BrandBourns
$7.00
Each
units
100kΩ Through Hole 12 Side Adjust 0.25W 3266 Pin 7.73mm ±10% - ±100ppm/°C - - -
RS Stock No. 743-2432
Mfr. Part No.3386G-1-101LF
BrandBourns
$2.86
Each
units
100Ω Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 652-4439
Mfr. Part No.416XA204P
$1.04
Each (In a Pack of 10)
units
200kΩ Through Hole 1 Side Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°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. 522-2340
Mfr. Part No.3386F-1-203TLF
BrandBourns
$3.71
Each
units
20kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 851-7483
Mfr. Part No.RJ24FW103
BrandBourns
$9.36
Each
units
10kΩ Panel Mount 25 - 0.5W RJ24 PC Pin 11.55mm ±10% - - - - -
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