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. 240-1534
Mfr. Part No.3214W-1-102E
BrandBourns
TWD105.80
Each (In a Pack of 5)
units
1 kΩ Surface Mount 5 Top Adjust 0.25W 3214 J-Hook 4.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-9513
Mfr. Part No.M70Y502KB25
BrandVishay
TWD1,468.50
Each (In a Box of 50)
units
5 kΩ Through Hole 20 Side Adjust 1W 70Y Pin 33.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 186-047
Mfr. Part No.M70Y502KB25
BrandVishay
TWD2,064.00
Each
units
5 kΩ Through Hole 20 Side Adjust 1W 70Y Pin 33.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 738-042
Mfr. Part No.3224G-1-203E
BrandBourns
TWD161.00
Each
units
20 kΩ Surface Mount 12 Side Adjust 0.25W 3224 Gull Wing 4.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3234
Mfr. Part No.3224G-1-203E
BrandBourns
TWD86.60
Each (On a Reel of 500)
units
20 kΩ Surface Mount 12 Side Adjust 0.25W 3224 Gull Wing 4.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-2457
Mfr. Part No.3386F-1-504LF
BrandBourns
TWD53.00
Each
units
500 kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 796-4939
Mfr. Part No.3214J-1-102E
BrandBourns
TWD102.00
Each
units
1 kΩ Surface Mount 5 Side Adjust 0.25W 3214 J-Hook 4.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 169-3025
Mfr. Part No.M43P203KB40
BrandVishay
TWD63.80
Each (In a Box of 200)
units
20 kΩ Through Hole 20 Side Adjust 0.5W 43P Pin 20.57mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-0215
Mfr. Part No.3296Y-1-502LF
BrandBourns
TWD96.00
Each
units
5 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 162-243
Mfr. Part No.M43P203KB40
BrandVishay
TWD83.00
Each
units
20 kΩ 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. 167-3465
Mfr. Part No.3386F-1-504LF
BrandBourns
TWD39.60
Each (In a Tube of 50)
units
500 kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 172-4461
Mfr. Part No.EVM2NSX80B13
BrandPanasonic
TWD9.40
Each (On a Reel of 3000)
units
- Surface Mount 1 Top Adjust 0.15W EVM2N Solder Pad 2.2mm ±25% - ±250ppm/°C - - -
RS Stock No. 167-3504
Mfr. Part No.3296Y-1-502LF
BrandBourns
TWD72.50
Each (In a Tube of 50)
units
5 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 461-7135
Mfr. Part No.TC33X-2-103E
BrandBourns
TWD6.80
Each (In a Pack of 50)
units
10 kΩ Surface Mount 1 Top Adjust 0.1W TC33 Solder Pad 3mm ±25% - ±250ppm/°C - - -
RS Stock No. 166-9937
Mfr. Part No.3214J-1-102E
BrandBourns
TWD58.20
Each (On a Reel of 500)
units
1 kΩ Surface Mount 5 Side Adjust 0.25W 3214 J-Hook 4.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 177-475
Mfr. Part No.3224W-1-502E
BrandBourns
TWD161.40
Each (In a Pack of 5)
units
5 kΩ Surface Mount 12 Top Adjust 0.25W 3224 J-Hook 4.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3549
Mfr. Part No.TC33X-2-103E
BrandBourns
TWD4.00
Each (On a Reel of 2500)
units
10 kΩ Surface Mount 1 Top Adjust 0.1W TC33 Solder Pad 3mm ±25% - ±250ppm/°C - - -
RS Stock No. 850-9678
Mfr. Part No.T73YP504KT20
BrandVishay
TWD17.50
Each (In a Pack of 1000)
units
500 kΩ Through Hole 1 Top Adjust 0.18W T73 PC Pin 6.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 186-053
Mfr. Part No.M70Y103KB25
BrandVishay
TWD1,998.00
Each
units
10 kΩ Through Hole 20 Side Adjust 1W 70Y Pin 33.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3405
Mfr. Part No.3296Y-1-103LF
BrandBourns
TWD72.90
Each (In a Tube of 50)
units
10 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -