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. 167-3241
Mfr. Part No.3006P-1-501LF
BrandBourns
€1.384
Each (In a Tube of 25)
units
500Ω Through Hole 15 Side Adjust 0.75W 3006 Pin 20.57mm ±10% - ±100ppm/°C - - -
RS Stock No. 162-215
Mfr. Part No.M43P202KB40
BrandVishay
€2.20
Each
units
2kΩ Through Hole 20 Side Adjust 1/2W 43P Pin 20.57mm ±10% 4.83mm ±100ppm/°C 6.35mm 20.57 x 4.83 x 6.35mm -
RS Stock No. 521-9120
Mfr. Part No.3006P-1-501LF
BrandBourns
€1.85
Each
units
500Ω Through Hole 15 Side Adjust 0.75W 3006 Pin 20.57mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9142
Mfr. Part No.3006P-1-503LF
BrandBourns
€1.87
Each
units
50kΩ Through Hole 15 Side Adjust 0.75W 3006 Pin 20.57mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-5208
Mfr. Part No.3006P-7-202LF
BrandBourns
€1.672
Each (In a Tube of 25)
units
2kΩ Through Hole 15 Side Adjust 0.75W 3006 Pin 19.05mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-0912
Mfr. Part No.3362P-1-105LF
BrandBourns
€1.13
Each
units
1MΩ Through Hole 1 Top Adjust 0.5W 3362 Pin 6.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 277-0199
Mfr. Part No.M43P502KB30T601
BrandVishay
€4.51
Each
units
5kΩ Panel Mount, Through Hole 20 Side Adjust 0.5W 43P Pin 27.81mm ±10% - ±100ppm/°C - - -
RS Stock No. 788-5047
Mfr. Part No.T93XB102KT20
BrandVishay
€1.202
Each (In a Pack of 5)
units
1kΩ Through Hole 21 Side Adjust 0.5W T93 Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 652-4243
Mfr. Part No.416MA504P
€0.228
Each (In a Pack of 10)
units
500kΩ Through Hole 1 Top Adjust 0.2W 416 Pin 6.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 167-3329
Mfr. Part No.3314G-1-504E
BrandBourns
€0.817
Each (On a Reel of 500)
units
500kΩ Surface Mount 1 Top Adjust 0.25W 3314 Gull Wing 5mm ±20% - ±100ppm/°C - - -
RS Stock No. 162-2453
Mfr. Part No.T93XB102KT20
BrandVishay
€0.519
Each (In a Tube of 50)
units
1kΩ Through Hole 21 Side Adjust 0.5W T93 Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 743-2338
Mfr. Part No.3296P-1-201LF
BrandBourns
€2.08
Each
units
200Ω Through Hole 25 Side Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 652-4760
Mfr. Part No.409VA502M
€0.438
Each (In a Pack of 5)
units
5kΩ Through Hole 1 Side Adjust 0.5W 409 Pin 9mm ±20% - ±250ppm/°C - - -
RS Stock No. 100-1234
Mfr. Part No.3314G-1-504E
BrandBourns
€1.198
Each (In a Pack of 10)
units
500kΩ Surface Mount 1 Top Adjust 0.25W 3314 Gull Wing 5mm ±20% - ±100ppm/°C - - -
RS Stock No. 167-3501
Mfr. Part No.3296W-1-501LF
BrandBourns
€1.429
Each (In a Tube of 50)
units
500Ω Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-9597
Mfr. Part No.M43P502KB30T601
BrandVishay
€2.448
Each (In a Box of 100)
units
5kΩ Panel Mount, Through Hole 20 Side Adjust 0.5W 43P Pin 27.81mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3256
Mfr. Part No.3362P-1-105LF
BrandBourns
€0.653
Each (In a Tube of 50)
units
1MΩ Through Hole 1 Top Adjust 0.5W 3362 Pin 6.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-5228
Mfr. Part No.3296P-1-201LF
BrandBourns
€1.429
Each (In a Tube of 50)
units
200Ω Through Hole 25 Side Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3236
Mfr. Part No.3006P-1-103LF
BrandBourns
€1.384
Each (In a Tube of 25)
units
10kΩ Through Hole 15 Side Adjust 0.75W 3006 Pin 20.57mm ±10% - ±100ppm/°C - - -
RS Stock No. 173-5338
Mfr. Part No.409VA502M
€0.399
Each (In a Box of 1000)
units
5kΩ Through Hole 1 Side Adjust 0.5W 409 Pin 9mm ±20% - ±250ppm/°C - - -
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