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. 240-1512
Mfr. Part No.3214W-1-201E
BrandBourns
€2.692
Each (In a Pack of 5)
units
200Ω Surface Mount 5 Top Adjust 0.25W 3214 J-Hook 4.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 144-2069
Mfr. Part No.89PR500LFTB
€0.771
Each (In a Tube of 25)
units
500Ω Through Hole 20 Side Adjust 0.75W 89 Solder Pin 19.05mm ±10% - ±100ppm/°C - - 200 V dc
RS Stock No. 144-2078
Mfr. Part No.64WR5KLF
€1.318
Each (In a Tube of 50)
units
5kΩ Through Hole 12 Top Adjust 0.25 W @ 85 °C 64 Solder Pin 6.35mm ±10% - ±100ppm/°C - - 200 V dc
RS Stock No. 167-4449
Mfr. Part No.3224J-1-102E
BrandBourns
€2.19
Each (On a Reel of 500)
units
1kΩ Surface Mount 12 Side Adjust 0.25W 3224 J-Hook 4.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 161-6811
Mfr. Part No.3306P-1-101
BrandBourns
€0.285
Each (In a Bag of 200)
units
100Ω Through Hole 1 Top Adjust 0.2W 3306 Pin 6.81mm ±25% - ±250ppm/°C - - -
RS Stock No. 167-4457
Mfr. Part No.3312J-1-202E
BrandBourns
€1.194
Each (On a Reel of 500)
units
2kΩ Surface Mount 1 Top Adjust 0.1W 3312 J-Hook 2.5mm ±20% - ±100ppm/°C - - -
RS Stock No. 488-5322
Mfr. Part No.3306P-1-502
BrandBourns
€0.306
Each (In a Pack of 10)
units
5kΩ Through Hole 1 Top Adjust 0.2W 3306 Pin 6.81mm ±25% - ±250ppm/°C - - -
RS Stock No. 167-9953
Mfr. Part No.T93YA105KT20
BrandVishay
€1.058
Each (In a Tube of 50)
units
1MΩ Through Hole 21 Top Adjust 0.06W T93 Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 161-6994
Mfr. Part No.3296Y-1-224LF
BrandBourns
€1.385
Each (In a Tube of 50)
units
220kΩ Through Hole 25 Top Adjust 0.5W 3296 Solder Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3410
Mfr. Part No.3299W-1-200LF
BrandBourns
€1.648
Each (In a Tube of 50)
units
20Ω Through Hole 25 Top Adjust 0.5W 3299 Pin 9.53mm ±10% - ±100ppm/°C - - -
RS Stock No. 166-9951
Mfr. Part No.3224G-1-253E
BrandBourns
€1.905
Each (On a Reel of 500)
units
25kΩ Surface Mount 12 Side Adjust 0.25W 3224 Gull Wing 4.8mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-9940
Mfr. Part No.T93XA102KT20
BrandVishay
€0.955
Each (In a Tube of 50)
units
1kΩ Through Hole 21 Side Adjust 0.5W T93 Pin 9.7mm ±10% - ±100ppm/°C - - -
RS Stock No. 182-5703
Mfr. Part No.RJ-13SR 2K Ohm (202)
€3.76
Each
units
2kΩ Through Hole 1 Side Adjust 0.75W RJ-13 Solder - ±10% - ±100ppm/°C - - 38.7 V
RS Stock No. 850-9640
Mfr. Part No.T73XX503KT20
BrandVishay
€0.365
Each (In a Pack of 1000)
units
50kΩ Through Hole 1 Side Adjust 0.5W T73 PC Pin 6.6mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-3342
Mfr. Part No.3306P-1-105
BrandBourns
€0.297
Each (In a Bag of 200)
units
1MΩ Through Hole 1 Top Adjust 0.2W 3306 Pin 6.81mm ±25% - ±250ppm/°C - - -
RS Stock No. 144-2215
Mfr. Part No.67XR1KLF
€1.296
Each (In a Pack of 5)
units
1kΩ Through Hole 20 Side Adjust 0.5W 67 Solder Pin 11.11mm ±10% - ±100ppm/°C - - 200 V dc
RS Stock No. 787-0691
Mfr. Part No.3314G-2-500E
BrandBourns
€1.337
Each (In a Pack of 10)
units
50Ω Surface Mount 1 Top Adjust 0.25W 3314 Gull Wing 5mm ±20% - ±100ppm/°C - - -
RS Stock No. 294-3555
Mfr. Part No.M43P202KB30T601
BrandVishay
€4.36
Each
units
2kΩ Panel Mount, Through Hole 20 Side Adjust 0.5W 43P Pin 27.81mm ±10% - ±100ppm/°C - - -
RS Stock No. 167-5315
Mfr. Part No.PV36W101C01B00
BrandBourns
€1.186
Each (In a Tube of 50)
units
100Ω Through Hole 25 Top Adjust 0.5W PV36 Solder Pin 9.6mm ±10% - ±150ppm/°C - - -
RS Stock No. 486-7560
Mfr. Part No.TS53YL204MR10
BrandVishay
€1.206
Each (In a Pack of 5)
units
200kΩ Surface Mount 1 Top Adjust 0.2W TS53 Gull Wing 5mm ±20% - ±100ppm/°C - - -
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