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. 172-4152
Mfr. Part No.EVM1DSX30B53
BrandPanasonic
£0.568
Each (On a Reel of 1000)
Units
- Surface Mount 1 Top Adjust 0.2W EVM1D Solder Pad 3.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 726-3804
Mfr. Part No.EVM1DSX30B53
BrandPanasonic
£0.614
Each (In a Pack of 5)
Units
5kΩ Surface Mount 1 Top Adjust 0.2W EVM1D Solder Pad 3.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 729-9651
Mfr. Part No.EVM2WSX80B13
BrandPanasonic
£0.304
Each (In a Pack of 5)
Units
1kΩ Surface Mount 1 Top Adjust 0.15W EVM2W Solder Pad 2.2mm ±25% - ±250ppm/°C - - -
RS Stock No. 106-8187
Mfr. Part No.EVM2WSX80B13
BrandPanasonic
£320.32
1 Reel of 3000
Reel(s)
1kΩ Surface Mount 1 Top Adjust 0.15W EVM2W Solder Pad 2.2mm ±25% - ±250ppm/°C - - -
RS Stock No. 729-9878
Mfr. Part No.EVM3WSX80B14
BrandPanasonic
£0.286
Each (In a Pack of 5)
Units
10kΩ Surface Mount 1 Top Adjust 0.15W EVM3W Solder Pad 3.1mm ±25% - ±250ppm/°C - - -
RS Stock No. 106-8292
Mfr. Part No.EVM3WSX80B14
BrandPanasonic
£404.70
1 Reel of 3000
Reel(s)
10kΩ Surface Mount 1 Top Adjust 0.15W EVM3W Solder Pad 3.1mm ±25% - ±250ppm/°C - - -
RS Stock No. 731-2874
Mfr. Part No.EVM3YSX50B53
BrandPanasonic
£0.04
Each (In a Pack of 5)
Units
5kΩ Surface Mount 1 Top Adjust 0.15W EVM3Y Solder Pad 3.1mm ±25% - ±250ppm/°C - - -
RS Stock No. 172-4449
Mfr. Part No.EVM3YSX50B53
BrandPanasonic
£0.03
Each (On a Reel of 2000)
Units
- Surface Mount 1 Top Adjust 0.15W EVM3Y Solder Pad 3.1mm ±25% - ±250ppm/°C - - -
RS Stock No. 729-9667
Mfr. Part No.EVM2WSX80B14
BrandPanasonic
£0.35
Each (In a Pack of 5)
Units
10kΩ Surface Mount 1 Top Adjust 0.15W EVM2W Solder Pad 2.2mm ±25% - ±250ppm/°C - - -
RS Stock No. 172-4469
Mfr. Part No.EVM2WSX80B14
BrandPanasonic
£0.186
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. 923-0124
Mfr. Part No.EVMAASA00B14
BrandPanasonic
£155.82
1 Reel of 1000
Reel(s)
10kΩ Through Hole 1 Top Adjust 0.3W EVMAA Pin 7.8mm ±25% - ±200ppm/°C - - -
RS Stock No. 726-3845
Mfr. Part No.EVMAASA00B14
BrandPanasonic
£0.292
Each (In a Pack of 5)
Units
10kΩ Through Hole 1 Top Adjust 0.3W EVMAA Pin 7.8mm ±25% - ±200ppm/°C - - -
RS Stock No. 172-4153
Mfr. Part No.EVM1DSX30B14
BrandPanasonic
£0.277
Each (On a Reel of 1000)
Units
- Surface Mount 1 Top Adjust 0.2W EVM1D Solder Pad 3.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 729-9689
Mfr. Part No.EVM2WSX80B16
BrandPanasonic
£0.11
Each (In a Pack of 5)
Units
1MΩ Surface Mount 1 Top Adjust 0.15W EVM2W Solder Pad 2.2mm ±25% - ±250ppm/°C - - -
RS Stock No. 726-3807
Mfr. Part No.EVM1DSX30B14
BrandPanasonic
£0.308
Each (In a Pack of 5)
Units
10kΩ Surface Mount 1 Top Adjust 0.2W EVM1D Solder Pad 3.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 172-4105
Mfr. Part No.EVM2WSX80B16
BrandPanasonic
£0.106
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. 172-4102
Mfr. Part No.EVM3WSX80B52
BrandPanasonic
£0.183
Each (On a Reel of 3000)
Units
- Surface Mount 1 Top Adjust 0.15W EVM3W Solder Pad 3.1mm ±25% - ±250ppm/°C - - -
RS Stock No. 726-3839
Mfr. Part No.EVMAASA00B13
BrandPanasonic
£0.292
Each (In a Pack of 5)
Units
1kΩ Through Hole 1 Top Adjust 0.3W EVMAA Pin 7.8mm ±25% - ±200ppm/°C - - -
RS Stock No. 172-4729
Mfr. Part No.EVMAASA00B13
BrandPanasonic
£0.191
Each (In a Box of 1000)
Units
- Through Hole 1 Top Adjust 0.3W EVMAA Pin 7.8mm ±25% - ±200ppm/°C - - -
RS Stock No. 729-9608
Mfr. Part No.EVM2NSX80B13
BrandPanasonic
£0.10
Each (In a Pack of 5)
Units
1kΩ Surface Mount 1 Top Adjust 0.15W EVM2N Solder Pad 2.2mm ±25% - ±250ppm/°C - - -