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 Electrical Taper Height Dimensions
RS Stock No. 521-9647
Mfr. Part No.3296W-1-103LF
BrandBourns
TWD93
Each
units
10 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% 4.83mm ±100ppm/°C - 11.55mm 9.53 x 4.83 x 11.55mm
RS Stock No. 167-3377
Mfr. Part No.3296W-1-103LF
BrandBourns
TWD67
Each (In a Tube of 50)
units
10 kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% 4.83mm ±100ppm/°C - 11.55mm 9.53 x 4.83 x 11.55mm
RS Stock No. 729-9614
Mfr. Part No.EVM2NSX80B14
BrandPanasonic
TWD12
Each (In a Pack of 5)
units
10 kΩ Surface Mount 1 Top Adjust 0.15W EVM2N Solder Pad 2.2mm ±25% 2.81mm ±250ppm/°C - 0.81mm 2.2 x 2.81 x 0.81mm
RS Stock No. 691-7409
Mfr. Part No.3314J-1-103E
BrandBourns
TWD43
Each (In a Pack of 5)
units
10 kΩ Surface Mount 1 Top Adjust 0.25W 3314 J-Hook 4.5mm ±20% 4.5mm ±100ppm/°C - 2.55mm 4.5 x 4.5 x 2.55mm
RS Stock No. 167-4674
Mfr. Part No.3314J-1-103E
BrandBourns
TWD40
Each (On a Reel of 500)
units
10 kΩ Surface Mount 1 Top Adjust 0.25W 3314 J-Hook 4.5mm ±20% 4.5mm ±100ppm/°C - 2.55mm 4.5 x 4.5 x 2.55mm
RS Stock No. 474-9024
Mfr. Part No.RJ-13P 20k Ohm (203)
TWD116
Each
units
20 kΩ Through Hole 1 Top Adjust 0.75W RJ-13 Pin - ±10% - ±100ppm/°C - 6.3mm 12.4 (Dia.) x 6.3mm
RS Stock No. 167-3436
Mfr. Part No.3386G-1-103LF
BrandBourns
TWD32
Each (In a Tube of 50)
units
10 kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% 9.53mm ±100ppm/°C - 4.83mm 9.53 x 9.53 x 4.83mm
RS Stock No. 522-2485
Mfr. Part No.3386G-1-103LF
BrandBourns
TWD26
Each
units
10 kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% 9.53mm ±100ppm/°C - 4.83mm 9.53 x 9.53 x 4.83mm
RS Stock No. 167-3434
Mfr. Part No.3386G-1-102LF
BrandBourns
TWD32
Each (In a Tube of 50)
units
1 kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% 9.53mm ±100ppm/°C - 4.83mm 9.53 x 9.53 x 4.83mm
RS Stock No. 522-2479
Mfr. Part No.3386G-1-102LF
BrandBourns
TWD87
Each
units
1 kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% 9.53mm ±100ppm/°C - 4.83mm 9.53 x 9.53 x 4.83mm
RS Stock No. 522-2520
Mfr. Part No.3386G-1-203LF
BrandBourns
TWD41
Each
units
20 kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% 9.53mm ±100ppm/°C - 4.83mm 9.53 x 9.53 x 4.83mm
RS Stock No. 167-3498
Mfr. Part No.3296X-1-105LF
BrandBourns
TWD60
Each (In a Tube of 50)
units
1 MΩ Through Hole 25 Side Adjust 0.5W 3296 Pin 11.05mm ±10% 4.83mm ±100ppm/°C - 10.03mm 11.05 x 4.83 x 10.03mm
RS Stock No. 691-2621
Mfr. Part No.3302X-3-103E
BrandBourns
TWD14
Each (In a Pack of 5)
units
10 kΩ Surface Mount 1 Top Adjust 0.15W 3302 Solder Pad 2.2mm ±25% 2.75mm ±250ppm/°C - 1.05mm 2.2 x 2.75 x 1.05mm
RS Stock No. 161-7078
Mfr. Part No.3386G-1-203LF
BrandBourns
TWD17
Each (In a Tube of 50)
units
20 kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% 9.53mm ±100ppm/°C - 4.83mm 9.53 x 9.53 x 4.83mm
RS Stock No. 521-9883
Mfr. Part No.3296X-1-105LF
BrandBourns
TWD90
Each
units
1 MΩ Through Hole 25 Side Adjust 0.5W 3296 Pin 11.05mm ±10% 4.83mm ±100ppm/°C - 10.03mm 11.05 x 4.83 x 10.03mm
RS Stock No. 186-047
Mfr. Part No.M70Y502KB25
BrandVishay
TWD428
Each
units
5 kΩ Through Hole 20 Side Adjust 1W 70Y Pin 33.53mm ±10% 4.83mm ±100ppm/°C - 8mm 33.53 x 4.83 x 8mm
RS Stock No. 167-3541
Mfr. Part No.3214W-1-102E
BrandBourns
TWD93
Each (On a Reel of 250)
units
1 kΩ Surface Mount 5 Top Adjust 0.25W 3214 J-Hook 4.8mm ±10% 3.9mm ±100ppm/°C - 5.3mm 4.8 x 3.9 x 5.3mm
RS Stock No. 240-1534
Mfr. Part No.3214W-1-102E
BrandBourns
TWD102
Each (In a Pack of 5)
units
1 kΩ Surface Mount 5 Top Adjust 0.25W 3214 J-Hook 4.8mm ±10% 3.9mm ±100ppm/°C - 5.3mm 4.8 x 3.9 x 5.3mm
RS Stock No. 167-9513
Mfr. Part No.M70Y502KB25
BrandVishay
TWD411
Each (In a Box of 50)
units
5 kΩ Through Hole 20 Side Adjust 1W 70Y Pin 33.53mm ±10% 4.83mm ±100ppm/°C - 8mm 33.53 x 4.83 x 8mm
RS Stock No. 161-7077
Mfr. Part No.3386G-1-104LF
BrandBourns
TWD17
Each (In a Tube of 50)
units
100 kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% 9.53mm ±100ppm/°C - 4.83mm 9.53 x 9.53 x 4.83mm