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. 691-2577
Mfr. Part No.3269W-1-202LF
BrandBourns
TWD161.00
Each
units
2 kΩ Surface Mount 12 Top Adjust 0.25W 3269 Gull Wing 6.35mm ±10% - ±100ppm/°C - - -
RS Stock No. 162-221
Mfr. Part No.M43P502KB40
BrandVishay
TWD94.00
Each
units
5 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. 172-4469
Mfr. Part No.EVM2WSX80B14
BrandPanasonic
TWD8.40
Each (On a Reel of 3000)
units
- Surface Mount 1 Top Adjust 0.15W EVM2W Solder Pad 2.2mm ±25% - ±250ppm/°C - - -
RS Stock No. 787-0566
Mfr. Part No.3362P-1-302LF
BrandBourns
TWD35.00
Each
units
3 kΩ Through Hole 1 Top Adjust 0.5W 3362 Pin 6.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9287
Mfr. Part No.3266W-1-502LF
BrandBourns
TWD134.00
Each
units
5 kΩ Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
RS Stock No. 729-9667
Mfr. Part No.EVM2WSX80B14
BrandPanasonic
TWD15.80
Each (In a Pack of 5)
units
10 kΩ Surface Mount 1 Top Adjust 0.15W EVM2W Solder Pad 2.2mm ±25% - ±250ppm/°C - - -
RS Stock No. 167-3544
Mfr. Part No.3214W-1-502E
BrandBourns
TWD70.50
Each (On a Reel of 250)
units
5 kΩ Surface Mount 5 Top Adjust 0.25W 3214 J-Hook 4.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-4569
Mfr. Part No.3269W-1-202LF
BrandBourns
TWD123.10
Each (In a Tube of 50)
units
2 kΩ Surface Mount 12 Top Adjust 0.25W 3269 Gull Wing 6.35mm ±10% - ±100ppm/°C - - -
RS Stock No. 166-9933
Mfr. Part No.3224G-1-501E
BrandBourns
TWD89.50
Each (On a Reel of 500)
units
500 Ω Surface Mount 12 Side Adjust 0.25W 3224 Gull Wing 4.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3361
Mfr. Part No.3266W-1-102LF
BrandBourns
TWD98.50
Each (In a Tube of 50)
units
1 kΩ Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3357
Mfr. Part No.3266W-1-502LF
BrandBourns
TWD101.80
Each (In a Tube of 50)
units
5 kΩ Through Hole 12 Top Adjust 0.25W 3266 Pin 6.71mm ±10% - ±100ppm/°C - - -
RS Stock No. 729-9651
Mfr. Part No.EVM2WSX80B13
BrandPanasonic
TWD13.80
Each (In a Pack of 5)
units
1 kΩ Surface Mount 1 Top Adjust 0.15W EVM2W Solder Pad 2.2mm ±25% - ±250ppm/°C - - -
RS Stock No. 167-3337
Mfr. Part No.3314G-1-103E
BrandBourns
TWD36.70
Each (On a Reel of 500)
units
10 kΩ Surface Mount 1 Top Adjust 0.25W 3314 Gull Wing 5mm ±20% - ±100ppm/°C - - -
RS Stock No. 167-3265
Mfr. Part No.3362P-1-504LF
BrandBourns
TWD25.10
Each (In a Tube of 50)
units
500 kΩ Through Hole 1 Top Adjust 0.5W 3362 Pin 6.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 161-7042
Mfr. Part No.3329H-1-302LF
BrandBourns
TWD77.50
Each (In a Tube of 50)
units
3 kΩ Through Hole 1 Top Adjust 0.5W 3329 Solder Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 161-6960
Mfr. Part No.3362P-1-302LF
BrandBourns
TWD25.40
Each (In a Tube of 50)
units
3 kΩ Through Hole 1 Top Adjust 0.5W 3362 Pin 6.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 106-8187
Mfr. Part No.EVM2WSX80B13
BrandPanasonic
TWD8.10
Each (On a Reel of 3000)
units
1 kΩ Surface Mount 1 Top Adjust 0.15W EVM2W Solder Pad 2.2mm ±25% - ±250ppm/°C - - -
RS Stock No. 796-4831
Mfr. Part No.3329H-1-302LF
BrandBourns
TWD102.00
Each
units
3 kΩ Through Hole 1 Top Adjust 0.5W 3329 Solder Pin - ±10% - ±100ppm/°C - - -
RS Stock No. 729-9604
Mfr. Part No.EVM2NSX80B52
BrandPanasonic
TWD12.00
Each (In a Pack of 5)
units
500 Ω Surface Mount 1 Top Adjust 0.15W EVM2N Solder Pad 2.2mm ±25% - ±250ppm/°C - - -
RS Stock No. 154-2757
Mfr. Part No.M43P205KB40
BrandVishay
TWD74.00
Each
units
2 MΩ 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 -