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. 167-3364
Mfr. Part No.3296W-1-503LF
BrandBourns
€1.438
Each (In a Tube of 50)
units
50kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 169-3140
Mfr. Part No.T63YB103KT20
BrandVishay
€1.659
Each (In a Tube of 50)
units
10kΩ Through Hole 14 Top Adjust 0.25W T63 Pin 6.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3330
Mfr. Part No.3314G-1-105E
BrandBourns
€0.805
Each (On a Reel of 500)
units
1MΩ Surface Mount 1 Top Adjust 0.25W 3314 Gull Wing 5mm ±20% - ±100ppm/°C - - -
RS Stock No. 167-3409
Mfr. Part No.3299W-1-104LF
BrandBourns
€1.926
Each (In a Tube of 50)
units
100kΩ Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9754
Mfr. Part No.3296W-1-253LF
BrandBourns
€2.39
Each
units
25kΩ Through Hole 25 Top Adjust 0.5W 3296 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 743-2457
Mfr. Part No.3386X-1-102LF
BrandBourns
€1.62
Each
units
1kΩ Through Hole 1 Side Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 473-534
Mfr. Part No.CB10LV471M
€0.404
Each (In a Pack of 5)
units
470Ω Through Hole 1 Top Adjust 0.15W CB10 Pin 11mm ±20% - ±500ppm/°C - - -
RS Stock No. 167-5319
Mfr. Part No.PV36W203C01B00
BrandBourns
€1.223
Each (In a Tube of 50)
units
20kΩ Through Hole 25 Top Adjust 0.5W PV36 Solder Pin 9.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 522-1000
Mfr. Part No.3362P-1-504LF
BrandBourns
€1.23
Each
units
500kΩ Through Hole 1 Top Adjust 0.5W 3362 Pin 6.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 691-7418
Mfr. Part No.3314J-1-501E
BrandBourns
€1.76
Each (In a Pack of 5)
units
500Ω Surface Mount 1 Top Adjust 0.25W 3314 J-Hook 4.5mm ±20% - ±100ppm/°C - - -
RS Stock No. 167-5322
Mfr. Part No.PV36W501C01B00
BrandBourns
€1.227
Each (In a Tube of 50)
units
500Ω Through Hole 25 Top Adjust 0.5W PV36 Solder Pin 9.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 169-3073
Mfr. Part No.M64W101KB40
BrandVishay
€1.38
Each (In a Box of 200)
units
100Ω Through Hole 19 (Electrical), 22 (Mechanical) Top Adjust 0.5W 64W Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 743-2491
Mfr. Part No.TC33X-2-502E
BrandBourns
€0.258
Each (In a Pack of 5)
units
5kΩ Surface Mount 1 Top Adjust 0.1W TC33 Solder Pad 3.8mm ±25% - ±250ppm/°C - - -
RS Stock No. 753-6809
Mfr. Part No.3142W103P
€1.39
Each
units
10kΩ Surface Mount 1 Top Adjust 0.15W 3142 Tab 4mm ±25% - ±250ppm/°C - - -
RS Stock No. 167-3456
Mfr. Part No.3386F-1-203TLF
BrandBourns
€1.584
Each (In a Tube of 50)
units
20kΩ Through Hole 1 Top Adjust 0.5W 3386 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 162-170
Mfr. Part No.M43P101KB40
BrandVishay
€1.97
Each
units
100Ω 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. 167-5326
Mfr. Part No.PV36X102C01B00
BrandBourns
€1.261
Each (In a Tube of 50)
units
1kΩ Through Hole 25 Side Adjust 0.5W PV36 Solder Pin 9.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-4446
Mfr. Part No.3223W-1-203E
BrandBourns
€1.739
Each (On a Reel of 500)
units
20kΩ Surface Mount 11 Top Adjust 0.125W 3223 J-Hook 3.9mm ±20% - ±100ppm/°C - - -
RS Stock No. 167-3531
Mfr. Part No.3224W-1-103E
BrandBourns
€2.076
Each (On a Reel of 250)
units
10kΩ Surface Mount 12 Top Adjust 0.25W 3224 J-Hook 4.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 521-9079
Mfr. Part No.3006P-1-201LF
BrandBourns
€1.85
Each
units
200Ω Through Hole 15 Side Adjust 0.75W 3006 Pin 20.57mm ±10% - ±100ppm/°C - - -
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