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. 788-5022
Mfr. Part No.T93XA501KT20
BrandVishay
$2.926
Each (In a Pack of 5)
units
500Ω Through Hole 21 (Electrical) Turns, 23 (Mechanical) Turns Side Adjust 0.5W T93 Pin 9.7mm ±10% - - - - -
RS Stock No. 161-6879
Mfr. Part No.93R1A-R22-A12L
BrandBourns
$8.03
Each (In a Tray of 45)
units
2.5kΩ Panel Mount, Through Hole 1 Side Adjust 2W 93 Pin 34.7mm ±10% - ±150ppm/°C - - -
RS Stock No. 154-2022
Mfr. Part No.M64W102KB40
BrandVishay
$4.79
Each
units
1kΩ Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 1/2W 64W Pin 9.7mm ±10% 5mm ±100ppm/°C 11.1mm 9.7 x 5 x 11.1mm -
RS Stock No. 850-9704
Mfr. Part No.T93YA100KT20
BrandVishay
$2.75
Each
units
10Ω Through Hole 21 (Electrical), 23 (Mechanical) Top Adjust 0.5W T93 PC Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 162-2450
Mfr. Part No.T93XA501KT20
BrandVishay
$2.376
Each (In a Tube of 50)
units
500Ω Through Hole 21 (Electrical) Turns, 23 (Mechanical) Turns Side Adjust 0.5W T93 Pin 9.7mm ±10% - - - - -
RS Stock No. 169-3076
Mfr. Part No.M64W102KB40
BrandVishay
$3.663
Each (In a Box of 200)
units
1kΩ Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 0.5W 64W Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9293
Mfr. Part No.3266W-1-503LF
BrandBourns
$7.23
Each
units
50kΩ Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-1038
Mfr. Part No.3362W-1-104LF
BrandBourns
$1.72
Each
units
100kΩ Through Hole 1 Side Adjust 0.5W 3362 Pin 6.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3358
Mfr. Part No.3266W-1-503LF
BrandBourns
$5.148
Each (In a Tube of 50)
units
50kΩ Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
RS Stock No. 769-2186
Mfr. Part No.PV36W502C01B00
BrandBourns
$2.49
Each
units
5kΩ Through Hole 25 Top Adjust 0.5W PV36 Solder Pin 9.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 161-7084
Mfr. Part No.3386G-1-502LF
BrandBourns
$2.16
Each (In a Tube of 50)
units
5kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 748-1352
Mfr. Part No.3306W-1-504
BrandBourns
$0.627
Each (In a Pack of 10)
units
500kΩ Through Hole 1 Side Adjust 0.2W 3306 Pin 6.81mm ±25% - ±250ppm/°C - - -
RS Stock No. 167-3268
Mfr. Part No.3362W-1-104LF
BrandBourns
$1.309
Each (In a Tube of 50)
units
100kΩ Through Hole 1 Side Adjust 0.5W 3362 Pin 6.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 161-6781
Mfr. Part No.3306W-1-504
BrandBourns
$0.544
Each (In a Bag of 200)
units
500kΩ Through Hole 1 Side Adjust 0.2W 3306 Pin 6.81mm ±25% - ±250ppm/°C - - -
RS Stock No. 167-5323
Mfr. Part No.PV36W502C01B00
BrandBourns
$4.07
Each (In a Tube of 50)
units
5kΩ Through Hole 25 Top Adjust 0.5W PV36 Solder Pin 9.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3624
Mfr. Part No.93R1A-R22-A25L
BrandBourns
$8.03
Each (In a Tray of 45)
units
1MΩ Panel Mount, Through Hole 1 Side Adjust 2W 93 Pin 34.7mm ±10% - ±150ppm/°C - - -
RS Stock No. 522-5361
Mfr. Part No.93R1A-R22-A25L
BrandBourns
$10.24
Each
units
1MΩ Panel Mount, Through Hole 1 Side Adjust 2W 93 Pin 34.7mm ±10% - ±150ppm/°C - - -
RS Stock No. 743-2439
Mfr. Part No.3386G-1-502LF
BrandBourns
$2.86
Each
units
5kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°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. 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 - - -
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