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. 167-3477
Mfr. Part No.3386P-1-502LF
BrandBourns
MYR4.468
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. 169-3078
Mfr. Part No.M64W502KB40
BrandVishay
MYR7.649
Each (In a Box of 200)
units
5kΩ Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 0.5W 64W Pin 9.7mm ±10% - - - - -
RS Stock No. 522-2227
Mfr. Part No.3386F-1-103LF
BrandBourns
MYR6.54
Each
units
10kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3501
Mfr. Part No.3296W-1-501LF
BrandBourns
MYR7.48
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. 896-7172
Mfr. Part No.CT-6EV 5kR
MYR5.538
Each (In a Bag of 5)
units
5kΩ Through Hole 1 Top Adjust 0.5W CT6 Solder Pin 7mm ±10% - ±100ppm/°C - - 50 V
RS Stock No. 167-3492
Mfr. Part No.3266X-1-105LF
BrandBourns
MYR11.449
Each (In a Tube of 50)
units
1MΩ Through Hole 12 Side Adjust 0.25W 3266 Pin 7.73mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3255
Mfr. Part No.3362P-1-104LF
BrandBourns
MYR3.19
Each (In a Tube of 50)
units
100kΩ Through Hole 1 Top Adjust 0.5W 3362 Pin 6.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 851-7483
Mfr. Part No.RJ24FW103
BrandBourns
MYR25.80
Each
units
10kΩ Panel Mount 25 - 0.5W RJ24 PC Pin 11.55mm ±10% - - - - -
RS Stock No. 167-3543
Mfr. Part No.3214W-1-202E
BrandBourns
MYR8.67
Each (On a Reel of 250)
units
2kΩ Surface Mount 5 Top Adjust 0.25W 3214 J-Hook 4.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-5117
Mfr. Part No.TC33X-2-101E
BrandBourns
MYR0.495
Each (On a Reel of 2500)
units
100Ω Surface Mount 1 Top Adjust 0.1W TC33 Solder Pad 3.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 167-3491
Mfr. Part No.3296W-1-502LF
BrandBourns
MYR7.519
Each (In a Tube of 50)
units
5kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9782
Mfr. Part No.3296W-1-501LF
BrandBourns
MYR9.86
Each
units
500Ω Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 169-3082
Mfr. Part No.M64W104KB40
BrandVishay
MYR8.014
Each (In a Box of 200)
units
100kΩ Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 0.5W 64W Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 164-8709
Mfr. Part No.CB10LV223M
MYR0.873
Each (In a Box of 1000)
units
22kΩ Through Hole 1 Top Adjust 0.15W CB10 Pin 11mm ±20% - ±500ppm/°C - - -
RS Stock No. 167-3253
Mfr. Part No.3362P-1-103LF
BrandBourns
MYR3.19
Each (In a Tube of 50)
units
10kΩ Through Hole 1 Top Adjust 0.5W 3362 Pin 6.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 473-578
Mfr. Part No.CB10LV105M
MYR1.006
Each (In a Pack of 5)
units
1MΩ Through Hole 1 Top Adjust 0.15W CB10 Pin 11mm ±20% - - - - -
RS Stock No. 167-3493
Mfr. Part No.3266X-1-202LF
BrandBourns
MYR11.449
Each (In a Tube of 50)
units
2kΩ Through Hole 12 Side Adjust 0.25W 3266 Pin 7.73mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3436
Mfr. Part No.3386G-1-103LF
BrandBourns
MYR4.267
Each (In a Tube of 50)
units
10kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 154-2072
Mfr. Part No.M64W104KB40
BrandVishay
MYR11.94
Each
units
100kΩ 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. 521-9681
Mfr. Part No.3296W-1-200LF
BrandBourns
MYR9.45
Each
units
20Ω Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
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